2010 Cadillac CTS Sedan AWD V6-3.6L Page 1109

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1109

circuit/connections test normal, replace the ECM.

5. Verify that the following conditions do not exist:

* Lean, rich, or leaking fuel injectors.

* A fuel pressure that is too low or too high-Refer to Fuel System Diagnosis (See: Powertrain Management/Computers and Control

Systems/Testing and Inspection/Component Tests and General Diagnostics/Fuel System Diagnosis).

* Fuel that is contaminated-Refer to Alcohol/Contaminants-in-Fuel Diagnosis (with Special Tool) (See: Powertrain

Management/Computers and Control Systems/Testing and Inspection/Component Tests and General

Diagnostics/Alcohol/Contaminants-in-Fuel Diagnosis (with Special Tool))Alcohol/Contaminants-in-Fuel Diagnosis (without Special

Tool) (See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and General

Diagnostics/Alcohol/Contaminants-in-Fuel Diagnosis (without Special Tool)).

* Evidence of water intrusion into the electrical connector of the HO2S

* The HO2S is loose

* Exhaust leaks near the HO2S

* Engine vacuum leaks

瀚慖f you find any of the above conditions, repair as necessary.

6. If all circuits/connections test normal, replace the appropriate HO2S sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen

Sensor/Service and Repair)Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (LLT) (See: Powertrain Management/Computers and

Control Systems/Oxygen Sensor/Service and Repair)

* Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen

Sensor/Service and Repair)Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (LLT) (See: Powertrain Management/Computers and

Control Systems/Oxygen Sensor/Service and Repair)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for engine control module replacement, setup, and

programming

P0160

DTC P0137, P0138, P0140, P0157, P0158, or P0160 (With LLT)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0137

- HO2S Circuit Low Voltage Bank 1 Sensor 2

DTC P0138

- HO2S Circuit High Voltage Bank 1 Sensor 2

DTC P0140

- HO2S Circuit Insufficient Activity Bank 1 Sensor 2

DTC P0157

- HO2S Circuit Low Voltage Bank 2 Sensor 2

DTC P0158

- HO2S Circuit High Voltage Bank 2 Sensor 2

DTC P0160

- HO2S Circuit Insufficient Activity Bank 2 Sensor 2

Diagnostic Fault Information

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1144

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1144

瀚慖f the test lamp is ON, test the high voltage control circuit for a short to voltage. If the circuit tests normal, replace the ECM.

10. Clear the DTC information with a scan tool, then cycle the ignition OFF.

11. Ignition OFF, connect a test lamp between the high voltage supply circuit terminal and the high voltage control circuit terminal of the

appropriate injector listed below.

* Fuel Injector 1 terminal 8 and terminal 2 X117

* Fuel Injector 2 terminal 2 and terminal 1 X116

* Fuel Injector 3 terminal 9 and terminal 3 X117

* Fuel Injector 4 terminal 4 and terminal 3 X116

* Fuel Injector 5 terminal 10 and terminal 4 X117

* Fuel Injector 6 terminal 6 and terminal 5 X116

12. Crank or start the engine while observing the test lamp. The test lamp should flash several times and then stop when the DTC sets.

瀚慖f the test lamp does not flash, test the high voltage control circuit for an open/high resistance. If the circuit tests normal, replace the

ECM.

Note: Testing for the following steps is performed on the fuel injector side of the multi-way harness connector. It may be necessary to

remove the intake manifold to isolate the condition.

13. Ignition OFF, measure the resistance between the appropriate high voltage supply circuit and ground. The DMM should display OL ohm.

瀚慖f less than the specified range, test the high voltage supply circuit and the high voltage control circuit for a short to ground. If the

circuits/connections test normal, test or replace the appropriate fuel injector(s).

14. Test for 1.5-2.5 ohm between the appropriate high voltage supply circuit and the high voltage control circuit.

瀚慖f less than the specified range, test for a short between the high voltage supply circuit and the high voltage control circuit. If the

circuits/connections test normal, test or replace the appropriate fuel injector(s).

瀚慖f greater than the specified range, test the high voltage supply circuit and the high voltage control circuit for an open/high resistance. If

the circuits/connections test normal, test or replace the appropriate fuel injector.

Component Testing

1. Remove the intake manifold and disconnect the appropriate fuel injector.

2. Verify the resistance of each fuel injector with one of the following methods:

* If the engine coolant temperature (ECT) sensor is between 10-32掳C (50-90掳F), the resistance of each fuel injector should be 1.25-1.75

ohm.

瀚慖f not within the specified range, replace the fuel injector.

* If the ECT sensor is not between 10-32掳C (50-90掳F), measure and record the resistance of each fuel injector with a DMM. Subtract the

lowest resistance value from the highest resistance value. The difference between the lowest value and the highest value should be equal

to or less than 0.45 ohm.

瀚慖f the difference is more than 0.45 ohm, add all of the fuel injector resistance values to obtain a total resistance value. Divide the total

resistance value by the number of fuel injectors to obtain an average resistance value. Subtract the lowest individual fuel injector

resistance value from the average resistance value. Compute the difference between the highest individual fuel injector resistance

value and the average resistance value. Replace the fuel injector that displays the greatest difference above or below the average.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Fuel Injector Replacement (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Injector/Service and Repair/Fuel Injector

Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming

P0202

DTC P0201-P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P2146, P2149, P2152, P2155,

P216A, or P216D (w/LLT)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

2010 Cadillac CTS Sedan AWD V6-3.6L Page 923

2010 Cadillac CTS Sedan AWD V6-3.6L Page 923

瀚慖f the test lamp is always OFF, test the control circuit for an open/high resistance. If the circuit/connections test normal, replace the ECM.

5. Ignition ON, test for 2.0-3.0 V between the control circuit terminal C and ground.

瀚慖f not within the specified range, test the control circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.

6. If all circuits/connections test normal, test or replace the HO2S sensor.

Component Testing

1. Ignition OFF, disconnect the harness connector at the heated oxygen sensor (HO2S) sensor.

2. Test for 5-25 ohm between the terminals C and D of the HO2S.

瀚慖f not within the specified range, replace the HO2S sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen

Sensor/Service and Repair)Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (LLT) (See: Powertrain Management/Computers and

Control Systems/Oxygen Sensor/Service and Repair)

* Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen

Sensor/Service and Repair)Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (LLT) (See: Powertrain Management/Computers and

Control Systems/Oxygen Sensor/Service and Repair)

* Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen

Sensor/Service and Repair)Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (LLT) (See: Powertrain Management/Computers and

Control Systems/Oxygen Sensor/Service and Repair)

* Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen

Sensor/Service and Repair)Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (LLT) (See: Powertrain Management/Computers and

Control Systems/Oxygen Sensor/Service and Repair)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for engine control module replacement, setup, and

programming

P0037

DTC P0030, P0031, P0032, P0036, P0037, P0038, P0050, P0051, P0052, P0056, P0057, or P0058 (LLT)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0030

- HO2S Heater Control Circuit Bank 1 Sensor 1

DTC P0031

- HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 1

DTC P0032

- HO2S Heater Control Circuit High Voltage Bank 1 Sensor 1

DTC P0036

- Heater Control Circuit Bank 1 Sensor 2

DTC P0037

- HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2

DTC P0038

- HO2S Heater Control Circuit High Voltage Bank 1 Sensor 2

DTC P0050

- HO2S Heater Control Circuit Bank 2 Sensor 1

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2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2501

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal E and ground.

瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the ECM.

瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Test for less than 1 V between the TP sensor 1 signal circuit terminal D and ground.

瀚慖f greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.

5. Install a 3 A fused jumper wire between TP sensor 1 signal circuit terminal D and the 5 V reference circuit terminal E. Verify the scan tool

TP sensor 1 voltage parameter is greater than 4.8 V.

瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace

the ECM.

6. Test for 4.8-5.2 V between the TP sensor 2 signal circuit terminal F and ground.

瀚慖f less than specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the

ECM.

瀚慖f greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.

7. If all circuits test normal, test or replace the throttle body assembly.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Throttle Body Assembly Replacement (See: Powertrain Management/Fuel Delivery and Air Induction/Throttle Body/Service and

Repair/Removal and Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for Engine Control Module replacement,

programming, and setup

P2138

DTC P2120, P2122, P2123, P2125, P2127, P2128, or P2138

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provide an overview of each diagnostic category.

DTC Descriptors

DTC P2120

- Accelerator Pedal Position (APP) Sensor 1 Circuit

DTC P2122

- Accelerator Pedal Position (APP) Sensor 1 Circuit Low Voltage

DTC P2123

- Accelerator Pedal Position (APP) Sensor 1 Circuit High Voltage

DTC P2125

- Accelerator Pedal Position (APP) Sensor 2 Circuit

DTC P2127

- Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage

DTC P2128

- Accelerator Pedal Position (APP) Sensor 2 Circuit High Voltage

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2473

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2473

瀚慖f not within the specified range, test the circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

7. If all circuits and connections test normal, replace the throttle body assembly.

Repair Instructions

* Throttle Body Assembly Replacement (See: Powertrain Management/Fuel Delivery and Air Induction/Throttle Body/Service and

Repair/Removal and Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for Engine Control Module replacement,

programming, and setup

Repair Verification

1. Install any components that have been removed or replaced during diagnosis.

2. Perform any adjustments, programming or setup procedures that are required when a component is removed or replaced.

3. Clear the DTCs with a scan tool.

4. Turn OFF the ignition for 60 s.

Note: If the Throttle Sweep Test is not available on the scan tool, use the accelerator to perform the test. Refer to Diagnostic Aids for further

details.

5. Perform the Throttle Sweep Test while observing the TAC Motor parameter with a scan tool. The TAC Motor parameter should display

Enabled while the Throttle Sweep Test is in progress.

6. If the repair was related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, in

order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to the Diagnostic Trouble Code (DTC) List -

Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) and perform the appropriate diagnostic

procedure.

P2119

DTC P1516, P2101, P2119, or P2176

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P1516

- Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

DTC P2101

- Throttle Actuator Position Performance

DTC P2119

- Throttle Closed Position Performance

DTC P2176

- Minimum Throttle Position Not Learned

Diagnostic Fault Information

Circuit/System Description

The engine control module (ECM) controls the throttle valve by applying a varying voltage to the control circuits of the throttle actuator control

(TAC) motor. The ECM monitors the duty cycle that is required to actuate the throttle valve. The ECM monitors the throttle position (TP) sensors 1

and 2 to determine the actual throttle valve position.

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2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2074

瀚慖f greater than the specified range, test the signal circuit terminal 1 for a short to voltage. If the circuit tests normal, replace the ECM.

5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the 5-volt reference circuit terminal 3. Verify the scan tool FTP

sensor parameter is greater than 4.7 volts.

瀚慖f less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the

ECM.

6. If all circuits test normal, test or replace the FTP sensor.

Repair Instructions

* For DTC P0452 or P0453, always perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic

procedure

* For DTC P0451 or P0454, clear DTCs with a scan tool

* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup and programming

P0452

DTC P0451-P0454

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0451

- Fuel Tank Pressure (FTP) Sensor Performance

DTC P0452

- Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage

DTC P0453

- Fuel Tank Pressure (FTP) Sensor Circuit High Voltage

DTC P0454

- Fuel Tank Pressure (FTP) Sensor Intermittent

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

The fuel tank pressure (FTP) sensor measures air pressure or vacuum in the evaporative emission (EVAP) system. The engine control module

(ECM) supplies a 5-volt reference and a low reference circuit to the FTP sensor. The FTP sensor signal voltage varies depending on EVAP system

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2018

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2018

瀚慖f greater than the specified range, test the circuits for a short to voltage. If the circuits test normal, replace the ECM.

9. Test for intermittent or poor connections at the ECM, KS, and in-line connectors where present.

10. If all circuits test normal, replace the ECM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Knock Sensor 1 Replacement (See: Powertrain Management/Computers and Control Systems/Knock Sensor/Service and Repair/Knock

Sensor 1 Replacement)

* Knock Sensor 2 Replacement (See: Powertrain Management/Computers and Control Systems/Knock Sensor/Service and Repair/Knock

Sensor 2 Replacement)

* Engine Control Module Replacement (See: Powertrain Management/Computers and Control Systems/Engine Control Module/Service and

Repair)

* Engine Control Module Programming and Setup (See: Powertrain Management/Computers and Control Systems/Engine Control

Module/Testing and Inspection)

P0330

DTC P0324, P0325, P0326, P0327, P0328, P0330, P0332, or P0333

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0324

- Knock Sensor (KS) Module Performance

DTC P0325

- Knock Sensor (KS) Circuit Bank 1

DTC P0326

- Knock Sensor (KS) Performance

DTC P0327

- Knock Sensor (KS) Circuit Low Voltage Bank 1

DTC P0328

- Knock Sensor (KS) Circuit High Voltage Bank 1

DTC P0330

- Knock Sensor (KS) Circuit Bank 2

DTC P0332

- Knock Sensor (KS) Circuit Low Voltage Bank 2

DTC P0333

- Knock Sensor (KS) Circuit High Voltage Bank 2

Diagnostic Fault Information

Circuit/System Description

The knock sensor (KS) system enables the engine control module (ECM) to control the ignition timing for the best possible performance while

protecting the engine from potentially damaging levels of detonation. The ECM monitors 2 separate KS, one on each side of the engine block. Each

KS produces an AC voltage that varies, depending on the vibration levels detected during engine operation. The ECM receives the KS signal

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1778

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1778

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal E and ground.

瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the ECM.

瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Test for less than 1 V between the TP sensor 1 signal circuit terminal D and ground.

瀚慖f greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.

5. Install a 3 A fused jumper wire between TP sensor 1 signal circuit terminal D and the 5 V reference circuit terminal E. Verify the scan tool

TP sensor 1 voltage parameter is greater than 4.8 V.

瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace

the ECM.

6. Test for 4.8-5.2 V between the TP sensor 2 signal circuit terminal F and ground.

瀚慖f less than specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the

ECM.

瀚慖f greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.

7. If all circuits test normal, test or replace the throttle body assembly.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Throttle Body Assembly Replacement (See: Powertrain Management/Fuel Delivery and Air Induction/Throttle Body/Service and

Repair/Removal and Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for Engine Control Module replacement,

programming, and setup

P0123

DTC P0120, P0122, P0123, P0220, P0222, P0223, or P2135

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0120

- Throttle Position (TP) Sensor 1 Circuit

DTC P0122

- Throttle Position (TP) Sensor 1 Circuit Low Voltage

DTC P0123

- Throttle Position (TP) Sensor 1 Circuit High Voltage

DTC P0220

- Throttle Position (TP) Sensor 2 Circuit

DTC P0222

- Throttle Position (TP) Sensor 2 Circuit Low Voltage

DTC P0223

- Throttle Position (TP) Sensor 2 Circuit High Voltage

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2010 Cadillac CTS Sedan AWD V6-3.0L Page 1658

瀚慖f not the specified value, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

7. If all the circuits test normal, test or replace the reverse lockout assembly.

Repair Instructions

* Reverse Lockout Solenoid Replacement (See: Powertrain Management/Transmission Control Systems/Actuators and Solenoids -

Transmission and Drivetrain/Actuators and Solenoids - M/T/Shift Solenoid/Service and Repair/Reverse Lockout Solenoid Replacement)

* Engine Control Module Programming and Setup (w/LF1) (See: Powertrain Management/Computers and Control Systems/Engine Control

Module/Testing and Inspection)Engine Control Module Programming and Setup (w/LLT) (See: Powertrain Management/Computers and

Control Systems/Engine Control Module/Testing and Inspection)Engine Control Module Programming and Setup (V8) (See: Powertrain

Management/Computers and Control Systems/Engine Control Module/Testing and Inspection)

* Engine Control Module Replacement (See: Powertrain Management/Computers and Control Systems/Engine Control Module/Service and

Repair)

Repair Verification

1. Install any components or connectors that have been removed or replaced during diagnosis.

2. Perform any adjustment, programming, or setup procedures that are required when a component or module is removed or replaced.

3. Clear the DTCs.

4. Turn OFF the ignition for 60 seconds.

5. Engine running, command reverse lockout solenoid ON and OFF with a scan tool, while observing the reverse inhibit circuit status

parameters. The circuit status parameters should change from OK to Not Run or Not Run to OK.

瀚慖f another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) and perform the appropriate diagnostic procedure.

Aisin AY6 - Manual Transmission

DTC P0806

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC P0806

- Clutch Pedal Position (CPP) Sensor Circuit Performance

Diagnostic Fault Information

Typical Scan Tool Information

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1477

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1477

瀚慖f greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Verify the scan tool Engine Oil Pressure Sensor parameter is less than 0.2 volt.

瀚慖f greater than the specified range, test the signal circuit terminal A for a short to voltage. If the circuit tests normal, replace the ECM.

5. Install a 3A fused jumper wire between the signal circuit terminal A and the 5-volt reference circuit terminal B. Verify the scan tool Engine

Oil Pressure Sensor parameter is greater than 4.8 volts.

瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace

the ECM.

6. If all circuits test normal, test or replace the EOP sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Engine Oil Pressure Sensor and/or Switch Replacement (See: Engine, Cooling and Exhaust/Engine/Engine Lubrication/Oil Pressure

Sensor/Service and Repair)for 3.6L engine

* Engine Oil Pressure Sensor and/or Switch Replacement (See: Engine, Cooling and Exhaust/Engine/Engine Lubrication/Oil Pressure

Sensor/Service and Repair)for 4.8L, 5.3L, 6.0L, 6.2L or 7.0L engine

* Control Module References (See: Testing and Inspection/Programming and Relearning)for ECM replacement, setup and programming

P0532

DTC P0532 or P0533

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of the diagnostic category.

DTC Descriptors

DTC P0532

- Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit

DTC P0533

- Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit Low Voltage

Diagnostic Fault Information

Circuit/System Description

The engine control module (ECM) monitors the high side refrigerant pressure through the A/C refrigerant pressure sensor. The ECM supplies a

5-volt reference and a low reference to the sensor. Changes in the A/C refrigerant pressure cause the sensor signal to the ECM to vary. When the

pressure is high, the signal voltage is high. When the pressure is low, the signal voltage is low. When pressure is high, the ECM commands the

cooling fans on. When pressure is too high or too low, the ECM will not allow the A/C compressor clutch to engage.

Conditions for Running the DTC

* Engine is running.

* Any of the conditions for setting the DTC are met for 15 seconds.

* Battery voltage is between 11-18 volts.

Conditions for Setting the DTC

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1669

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1669

瀚慖f greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Ignition ON, verify that the scan tool CPP sensor parameter is less than 0.1 volts.

瀚慖f greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.

5. Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal C. Verify that the scan tool CPP

sensor parameter is between 4.8-5.2 volts.

瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace

the ECM.

6. If all circuits test normal, test or replace the CPP sensor.

Component Testing

1. Ignition OFF, disconnect the harness connector of the CPP sensor.

2. Measure the resistance between the signal terminal B and the low reference terminal A of the CPP sensor. Sweep the CPP sensor through the

entire range. The resistance should vary low to high and high to low without any spikes or dropouts.

瀚慖f the resistance is erratic with spikes or dropouts, replace the CPP sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Clutch Pedal Replacement (See: Transmission and Drivetrain/Clutch/Clutch Pedal Assembly/Service and Repair/Clutch Pedal Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup and programming

Tremec 6-Speed - Manual Transmission

DTC P0807 or P0808

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0807

- Clutch Pedal Position (CPP) Sensor Circuit Low Voltage

DTC P0808

- Clutch Pedal Position (CPP) Sensor Circuit High Voltage

Diagnostic Fault Information

Typical Scan Tool Information

2010 Cadillac Truck Escalade RWD V8-6.2L Page 2074

2010 Cadillac Truck Escalade RWD V8-6.2L Page 2074

瀚慖f greater than the specified range, test the signal circuit terminal 1 for a short to voltage. If the circuit tests normal, replace the ECM.

5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the 5-volt reference circuit terminal 3. Verify the scan tool FTP

sensor parameter is greater than 4.7 volts.

瀚慖f less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the

ECM.

6. If all circuits test normal, test or replace the FTP sensor.

Repair Instructions

* For DTC P0452 or P0453, always perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic

procedure

* For DTC P0451 or P0454, clear DTCs with a scan tool

* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup and programming

P0452

DTC P0451-P0454

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0451

- Fuel Tank Pressure (FTP) Sensor Performance

DTC P0452

- Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage

DTC P0453

- Fuel Tank Pressure (FTP) Sensor Circuit High Voltage

DTC P0454

- Fuel Tank Pressure (FTP) Sensor Intermittent

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

The fuel tank pressure (FTP) sensor measures air pressure or vacuum in the evaporative emission (EVAP) system. The engine control module

(ECM) supplies a 5-volt reference and a low reference circuit to the FTP sensor. The FTP sensor signal voltage varies depending on EVAP system

2010 Cadillac Truck Escalade RWD V8-6.2L Page 2018

2010 Cadillac Truck Escalade RWD V8-6.2L Page 2018

瀚慖f greater than the specified range, test the circuits for a short to voltage. If the circuits test normal, replace the ECM.

9. Test for intermittent or poor connections at the ECM, KS, and in-line connectors where present.

10. If all circuits test normal, replace the ECM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Knock Sensor 1 Replacement (See: Powertrain Management/Computers and Control Systems/Knock Sensor/Service and Repair/Knock

Sensor 1 Replacement)

* Knock Sensor 2 Replacement (See: Powertrain Management/Computers and Control Systems/Knock Sensor/Service and Repair/Knock

Sensor 2 Replacement)

* Engine Control Module Replacement (See: Powertrain Management/Computers and Control Systems/Engine Control Module/Service and

Repair)

* Engine Control Module Programming and Setup (See: Powertrain Management/Computers and Control Systems/Engine Control

Module/Testing and Inspection)

P0330

DTC P0324, P0325, P0326, P0327, P0328, P0330, P0332, or P0333

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0324

- Knock Sensor (KS) Module Performance

DTC P0325

- Knock Sensor (KS) Circuit Bank 1

DTC P0326

- Knock Sensor (KS) Performance

DTC P0327

- Knock Sensor (KS) Circuit Low Voltage Bank 1

DTC P0328

- Knock Sensor (KS) Circuit High Voltage Bank 1

DTC P0330

- Knock Sensor (KS) Circuit Bank 2

DTC P0332

- Knock Sensor (KS) Circuit Low Voltage Bank 2

DTC P0333

- Knock Sensor (KS) Circuit High Voltage Bank 2

Diagnostic Fault Information

Circuit/System Description

The knock sensor (KS) system enables the engine control module (ECM) to control the ignition timing for the best possible performance while

protecting the engine from potentially damaging levels of detonation. The ECM monitors 2 separate KS, one on each side of the engine block. Each

KS produces an AC voltage that varies, depending on the vibration levels detected during engine operation. The ECM receives the KS signal

2010 Cadillac Truck Escalade RWD V8-6.2L Page 1778

2010 Cadillac Truck Escalade RWD V8-6.2L Page 1778

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal E and ground.

瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the ECM.

瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Test for less than 1 V between the TP sensor 1 signal circuit terminal D and ground.

瀚慖f greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.

5. Install a 3 A fused jumper wire between TP sensor 1 signal circuit terminal D and the 5 V reference circuit terminal E. Verify the scan tool

TP sensor 1 voltage parameter is greater than 4.8 V.

瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace

the ECM.

6. Test for 4.8-5.2 V between the TP sensor 2 signal circuit terminal F and ground.

瀚慖f less than specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the

ECM.

瀚慖f greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.

7. If all circuits test normal, test or replace the throttle body assembly.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Throttle Body Assembly Replacement (See: Powertrain Management/Fuel Delivery and Air Induction/Throttle Body/Service and

Repair/Removal and Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for Engine Control Module replacement,

programming, and setup

P0123

DTC P0120, P0122, P0123, P0220, P0222, P0223, or P2135

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0120

- Throttle Position (TP) Sensor 1 Circuit

DTC P0122

- Throttle Position (TP) Sensor 1 Circuit Low Voltage

DTC P0123

- Throttle Position (TP) Sensor 1 Circuit High Voltage

DTC P0220

- Throttle Position (TP) Sensor 2 Circuit

DTC P0222

- Throttle Position (TP) Sensor 2 Circuit Low Voltage

DTC P0223

- Throttle Position (TP) Sensor 2 Circuit High Voltage

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1525

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1525

瀚慖f greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.

瀚慖f less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal replace

the ECM.

4. If the circuits test normal, replace the generator.

LLT Engine

1. Verify that a test lamp illuminates between the generator B+ X2 and ground.

瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

2. Ignition OFF, disconnect the X1 harness connector at the generator.

3. Ignition ON, test for less than 1 V between the control circuit terminal 1 and ground.

瀚慖f greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Engine running, test for greater than 3.5 V between the control circuit terminal 1 and ground.

瀚慖f less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal replace

the ECM.

5. If the circuits test normal, replace the generator.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Generator Replacement (LF1/LLT) (See: Starting and Charging/Charging System/Alternator/Service and Repair)Generator Replacement

(LSA) (See: Starting and Charging/Charging System/Alternator/Service and Repair)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming

P0622

DTC P0622

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC P0622

- Generator F-Terminal Circuit

Diagnostic Fault Information

Circuit/System Description

The engine control module (ECM) uses the generator field duty cycle signal circuit, or F-terminal circuit, to monitor the duty cycle of the generator.

The generator field duty cycle signal circuit connects to high side of the field windings in the generator. A pulse width modulated (PWM) high side

driver in the voltage regulator turns the field windings ON and OFF. The ECM uses the PWM signal input to determine the generator load on the

engine. This allows the ECM to adjust the idle speed to compensate for high electrical loads. The ECM monitors the status of the generator field

duty cycle signal circuit. When the ignition is ON and the engine is OFF, the ECM should detect a duty cycle near 0 percent. When the engine is

running, the duty cycle should be between 5-99 percent.

Conditions for Running the DTC

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1488

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1488

瀚慖f greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Verify the scan tool Engine Oil Pressure Sensor parameter is less than 0.2 volt.

瀚慖f greater than the specified range, test the signal circuit terminal A for a short to voltage. If the circuit tests normal, replace the ECM.

5. Install a 3A fused jumper wire between the signal circuit terminal A and the 5-volt reference circuit terminal B. Verify the scan tool Engine

Oil Pressure Sensor parameter is greater than 4.8 volts.

瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace

the ECM.

6. If all circuits test normal, test or replace the EOP sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Engine Oil Pressure Sensor and/or Switch Replacement (See: Engine, Cooling and Exhaust/Engine/Engine Lubrication/Oil Pressure

Sensor/Service and Repair)for 3.6L engine

* Engine Oil Pressure Sensor and/or Switch Replacement (See: Engine, Cooling and Exhaust/Engine/Engine Lubrication/Oil Pressure

Sensor/Service and Repair)for 4.8L, 5.3L, 6.0L, 6.2L or 7.0L engine

* Control Module References (See: Testing and Inspection/Programming and Relearning)for ECM replacement, setup and programming

P0532

DTC P0532 or P0533

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of the diagnostic category.

DTC Descriptors

DTC P0532

- Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit

DTC P0533

- Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit Low Voltage

Diagnostic Fault Information

Circuit/System Description

The engine control module (ECM) monitors the high side refrigerant pressure through the A/C refrigerant pressure sensor. The ECM supplies a

5-volt reference and a low reference to the sensor. Changes in the A/C refrigerant pressure cause the sensor signal to the ECM to vary. When the

pressure is high, the signal voltage is high. When the pressure is low, the signal voltage is low. When pressure is high, the ECM commands the

cooling fans on. When pressure is too high or too low, the ECM will not allow the A/C compressor clutch to engage.

Conditions for Running the DTC

* Engine is running.

* Any of the conditions for setting the DTC are met for 15 seconds.

* Battery voltage is between 11-18 volts.

Conditions for Setting the DTC

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2972

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2972

瀚慖f the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.

5. Remove the test lamp.

6. Command the appropriate cylinder deactivation solenoid ON with a scan tool. Verify the scan tool Cylinder Deactivation Solenoid Valve

Control Circuit High Voltage Test Status parameter displays OK.

瀚慖f not the specified value, test the appropriate control circuit listed below for a short to voltage. If the circuit tests normal, replace the

ECM.

* Cylinder deactivation solenoid valve 1 terminal C

* Cylinder deactivation solenoid valve 2 terminal A

* Cylinder deactivation solenoid valve 3 terminal B

* Cylinder deactivation solenoid valve 4 terminal D

7. Install a 3 A fused jumper wire between the appropriate control circuit terminal listed below and the ignition circuit terminal E. Command the

appropriate cylinder deactivation solenoid ON with a scan tool. Verify the scan tool Cylinder Deactivation Solenoid Valve Control Circuit

High Voltage Test Status parameter displays Malfunction.

* Cylinder deactivation solenoid valve 1 terminal C

* Cylinder deactivation solenoid valve 2 terminal A

* Cylinder deactivation solenoid valve 3 terminal B

* Cylinder deactivation solenoid valve 4 terminal D

瀚慖f not the specified value, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

8. If all the circuits test normal, test or replace the valve lifter oil manifold assembly.

Component Testing

Static Test

1. Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description ( See: Hybrid Drive

Systems/Description and Operation/Hybrid Modes of Operation).

2. Ignition ON, verify the scan tool Hood Position parameter displays Open.

瀚慖f not the specified value, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) for DTC P254F.

3. Ignition OFF, disconnect the harness connector at the valve lifter oil manifold assembly.

4. Connect the harness that is labeled resistance from the displacement on demand (DOD) tester to the valve lifter oil manifold connector.

5. Connect the power leads from the DOD tester to B+ and ground. Test for 11-18 ohm on each valve lifter oil manifold solenoid.

瀚慖f not within the specified range for each solenoid, replace the valve lifter oil manifold assembly.

6. Test for infinite resistance between each valve lifter oil manifold circuit terminal and the valve lifter oil manifold housing.

瀚慖f not the specified value, replace the valve lifter oil manifold assembly.

Dynamic Test

1. Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description ( See: Hybrid Drive

Systems/Description and Operation/Hybrid Modes of Operation).

2. Ignition ON, verify the scan tool Hood Position parameter displays Open.

瀚慖f not the specified value, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) for DTC P254F.

3. Ignition OFF, disconnect the harness connector at the valve lifter oil manifold assembly.

4. Connect the cable that is labeled power from the displacement on demand DOD tester to the connector.

5. Connect the power leads from the DOD tester to B+ and ground.

6. Command each valve lifter oil manifold solenoid ON and OFF using the DOD tester. You should be able to hear each solenoid turn ON and

OFF.

瀚慖f the function does not perform as specified, replace the valve lifter oil manifold assembly.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Valve Lifter Oil Manifold Replacement (See: Engine, Cooling and Exhaust/Engine/Camshaft, Lifters and Push Rods/Lifter / Lash

Adjuster/Service and Repair/Valve Lifter Oil Manifold Replacement)

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2889

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2889

瀚慖f less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.

瀚慖f greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.

5. Ignition ON, install a 3 A fused jumper wire between the signal circuit terminal B and ground. Verify the scan tool HO2S parameter is less

than 60 mV.

瀚慖f greater than the specified range, test the signal circuit for an open/high resistance. If the circuits test normal, replace the ECM.

6. Verify none of the following conditions exist:

* Rich fuel injectors-Refer to Fuel Injector Diagnosis (CH47976) (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel

Injector/Testing and Inspection)Fuel Injector Diagnosis (J39021 or Scan Tool) (See: Powertrain Management/Fuel Delivery and Air

Induction/Fuel Injector/Testing and Inspection)

* Water intrusion in the HO2S harness connector

* High fuel system pressure-Refer to Fuel System Diagnosis (w/o FPCM) (See: Powertrain Management/Computers and Control

Systems/Testing and Inspection/Component Tests and General Diagnostics)Fuel System Diagnosis (FPCM) (See: Powertrain

Management/Computers and Control Systems/Testing and Inspection/Component Tests and General Diagnostics)

* Fuel that is contaminated-Refer to Alcohol/Contaminants-in-Fuel Diagnosis (Without Special Tool) (See: Powertrain

Management/Computers and Control Systems/Testing and Inspection/Component Tests and General

Diagnostics/Alcohol/Contaminants-in-Fuel Diagnosis (Without Special Tool))Alcohol/Contaminants-in-Fuel Diagnosis (Special Tool) (

See: Powertrain Management/Fuel Delivery and Air Induction/Fuel/Testing and Inspection/Alcohol/Contaminants-in-Fuel Diagnosis

(Special Tool))

* Fuel saturation of the evaporative emission (EVAP) canister

瀚慖f you find any of the above conditions, repair as necessary.

7. If all circuits test normal, replace the appropriate HO2S.

Repair Instructions

Caution: Refer to Heated Oxygen Sensor Resistance Learn Reset Caution (See: Powertrain Management/Computers and Control

Systems/Oxygen Sensor/Service Precautions/Heated Oxygen Sensor Resistance Learn Reset Caution).

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (1500 Series) (See: Powertrain Management/Computers and Control

Systems/Oxygen Sensor/Service and Repair)Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500 Series) (See: Powertrain

Management/Computers and Control Systems/Oxygen Sensor/Service and Repair)

* Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (1500 Series) (See: Powertrain Management/Computers and Control

Systems/Oxygen Sensor/Service and Repair)Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (2500 Series) (See: Powertrain

Management/Computers and Control Systems/Oxygen Sensor/Service and Repair)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming

P2518

DTC P2518

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P2518 11

- A/C Refrigerant Low Side Fluid Pressure Sensor Circuit Above Maximum Threshold

DTC P2518 12

- A/C Refrigerant Low Side Fluid Pressure Sensor Circuit Below Minimum Threshold

Diagnostic Fault Information

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2875

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2875

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.

瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the ECM.

瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Verify the scan tool BARO sensor parameter is less than 2 kPa.

瀚慖f greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the ECM.

5. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 1. Verify the scan tool BARO

sensor parameter is greater than 126 kPa.

瀚慖f less than the specified range, test the signal circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace

the ECM.

6. If all circuits test normal, test or replace the BARO sensor.

Component Testing

Note: You must perform the Circuit/System Testing before proceeding with the Component Testing.

1. Ignition OFF, remove the BARO sensor.

2. Install a 3 A fused jumper wire between the 5 V reference circuit terminal 1 and the corresponding terminal of the BARO sensor.

3. Install a jumper wire between the low reference circuit terminal 2 of the BARO sensor and ground.

4. Install a jumper wire at terminal B of the BARO sensor.

5. Connect a DMM between the jumper wire from terminal 3 of the BARO sensor and ground.

6. Ignition ON, with the J-23738-A or J-35555, slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage

should vary between 0-5.2 V without any spikes or dropouts.

瀚慖f the voltage reading is erratic, replace the BARO sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Barometric Pressure Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Barometric Pressure

Sensor/Service and Repair)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming

P2229

DTC P2228 or P2229

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P2228

- Barometric Pressure (BARO) Sensor Circuit Low Voltage

DTC P2229

- Barometric Pressure (BARO) Sensor Circuit High Voltage

Diagnostic Fault Information

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1682

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1682

瀚慖f not the specified value, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

7. If all the circuits test normal, test or replace the reverse lockout assembly.

Repair Instructions

* Reverse Lockout Solenoid Replacement (See: Powertrain Management/Transmission Control Systems/Actuators and Solenoids -

Transmission and Drivetrain/Actuators and Solenoids - M/T/Shift Solenoid/Service and Repair/Reverse Lockout Solenoid Replacement)

* Engine Control Module Programming and Setup (w/LF1) (See: Powertrain Management/Computers and Control Systems/Engine Control

Module/Testing and Inspection)Engine Control Module Programming and Setup (w/LLT) (See: Powertrain Management/Computers and

Control Systems/Engine Control Module/Testing and Inspection)Engine Control Module Programming and Setup (V8) (See: Powertrain

Management/Computers and Control Systems/Engine Control Module/Testing and Inspection)

* Engine Control Module Replacement (See: Powertrain Management/Computers and Control Systems/Engine Control Module/Service and

Repair)

Repair Verification

1. Install any components or connectors that have been removed or replaced during diagnosis.

2. Perform any adjustment, programming, or setup procedures that are required when a component or module is removed or replaced.

3. Clear the DTCs.

4. Turn OFF the ignition for 60 seconds.

5. Engine running, command reverse lockout solenoid ON and OFF with a scan tool, while observing the reverse inhibit circuit status

parameters. The circuit status parameters should change from OK to Not Run or Not Run to OK.

瀚慖f another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) and perform the appropriate diagnostic procedure.

Aisin AY6 - Manual Transmission

DTC P0806

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC P0806

- Clutch Pedal Position (CPP) Sensor Circuit Performance

Diagnostic Fault Information

Typical Scan Tool Information