2010 Cadillac Truck SRX FWD V6-3.0L Page 1118

2010 Cadillac Truck SRX FWD V6-3.0L Page 1118

P0103

DTC P0102 or P0103 (LF1)

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 P0102

- Mass Air Flow (MAF) Sensor Circuit Low Frequency

DTC P0103

- Mass Air Flow (MAF) Sensor Circuit High Frequency

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

The mass air flow (MAF) sensor is integrated with the intake air temperature (IAT) sensor. The MAF sensor is an air flow meter that measures the

amount of air entering the engine. The engine control module (ECM) uses the MAF sensor signal to provide the correct fuel delivery for all engine

speeds and loads. A small quantity of air entering the engine indicates a deceleration or idle condition. A large quantity of air entering the engine

indicates an acceleration or high load condition. The MAF/IAT sensor has the following circuits:

* Ignition 1 voltage circuit

* Ground circuit

* MAF sensor signal circuit

* IAT sensor signal circuit

* IAT low reference circuit

The ECM applies 5 V to the MAF sensor on the MAF sensor signal circuit. The sensor uses the voltage to produce a frequency based on the inlet

air flow through the sensor bore. The frequency varies in a range of near 2,000 Hertz at idle to near 10,000 Hertz at maximum engine load.

Conditions for Running the DTC

* The engine is running for more than 1 s.

* The ignition 1 signal is greater than 8 V.

* The above conditions are met for greater than 1 s.

* The DTC runs continuously when the above conditions are met.

Conditions for Setting the DTC

2010 Cadillac CTS Sedan AWD V6-3.6L Page 996

2010 Cadillac CTS Sedan AWD V6-3.6L Page 996

P0103

The ECM detects that the MAF sensor signal is greater than 12,346 Hz.

Action Taken When the DTC Sets

DTCs P0100, P0102, and P0103 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0100, P0102, and P0103 are Type B DTCs.

Diagnostic Aids

* Inspect the harness of the B75B MAF/IAT sensor to verify that it is not routed too close to the following components:

- The secondary ignition wires or coils

- Any solenoids

- Any relays

- Any motors

* Inspect the hydro-carbon (HC) absorber, if equipped, in the air cleaner assembly for ruptures that would leak charcoal into the air intake,

contaminating the sensing element.

* Inspect for any contamination, water intrusion, or debris on the sensing elements of the MAF sensor. If debris is present, clean the sensor. If

the sensor cannot be cleaned, replace the sensor.

* A high resistance may cause a driveability concern before this DTC sets.

Reference Information

Schematic Reference

Engine Controls Schematics (LLT) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Air Intake System Description (w/LLT) (See: Powertrain Management/Fuel Delivery and Air Induction/Description and Operation/Air Intake

System Description)Air Intake System Description (w/LF1) (See: Powertrain Management/Fuel Delivery and Air Induction/Description and

Operation/Air Intake System Description)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Special Tools

J 38522 Variable Signal Generator

Circuit/System Verification

1. Verify that DTCs P0685, P0689, P0690 or B1380 are not set.

瀚慖f any of the DTCs are set, refer to Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code

Descriptions/Powertrain Diagnostic Trouble Code (DTC) Type Definitions).

2. Engine idling for 1 min, observe the DTC information with a scan tool. DTCs P0100, P0102 and P0103 should not set.

3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1854

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1854

* DTCs P0030, P0036, P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0117, P0118, P0120, P0121, P0128, P0130, P0131, P0132,

P0133, P0134, P0135, P0136, P0137, P0138, P0140, P0141, P0201-P0208, P0220, P0300, P0301-P0304, P0442, P0443, P0446, P0449,

P0452, P0453, P0455, P0496, P1106, P1107, P1114, P1115, P1133, P1516, P2101, P2119, P2120, P2125, P2135, P2138, P2176 are not set.

* The engine is in Closed Loop status.

* The engine coolant temperature (ECT) is between -40 and +150掳C (-40 and +302掳F).

* The intake air temperature (IAT) is between -20 and +150掳C (-4 and +302掳F).

* The manifold absolute pressure (MAP) is between 10-255 kPa (1.45-37 psi).

* The vehicle speed is less than 134 km/h (83 mph).

* The engine speed is between 375-7,000 RPM.

* The mass air flow (MAF) is between 1-510 g/s.

* The barometric pressure (BARO) is more than 70 kPa (10.2 psi).

* The fuel level is more than 10 %.

* This diagnostic runs continuously when the above conditions have been met.

Conditions for Setting the DTC

* The average long term FT weighted average value is more or less than a calibrated value.

* The above condition is present for approximately 3 min after the Conditions for Running the DTC have been met.

Action Taken When the DTC Sets

The ECM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the ECM stores this information in the

Failure Records. If the diagnostic reports a failure on the second ignition cycle the ECM records the operating conditions at the time of the failure.

The ECM writes the operating conditions to the Freeze Frame and updates the Failure Records. The ECM illuminates the malfunction indicator

lamp (MIL) when one of the following occur:

* The ECM detects the same fuel trim failure during 2 consecutive trips.

* The ECM detects any fuel trim failure during any subsequent trip if the conditions at the time of failure meet the following criteria:

- The engine load is within 20 % of the previous test that failed.

- The engine speed is within 375 RPM of the previous test that failed.

- The engine coolant temperature is in the same range of the previous test that failed.

Conditions for Clearing the MIL/DTC

* The ECM turns OFF the malfunction indicator lamp (MIL) at the beginning of the fourth ignition cycle, after 3 ignition cycles that the

diagnostic runs and does not fail.

* A current DTC, Last Test Failed, clears when the diagnostic runs and passes.

* A history DTC and related Freeze Frame data clears after 40 warm-up cycles, if no failures are reported by this or any other emission related

diagnostic.

* Clear the MIL and the DTC with a scan tool.

Reference Information

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

* Disregard any transmission symptoms, antilock brake system (ABS) indicators, and traction control system (TCS) indicators until any fuel

trim faults are repaired. A fuel trim fault may cause default actions such as harsh shifts and illumination of the ABS/TCS indicators.

* E85 compatible engine only-Over estimation of the ethanol content will result in a rich shift of fuel trim values, and under-estimation will

result in a lean shift of fuel trim values. A fuel trim DTC may set if the learned alcohol content, Fuel Alcohol Content parameter on the scan

tool, is different than the measured alcohol content in the vehicle such that fuel trim values exceed failure threshold values. Refer to Fuel

Composition Diagnosis (See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and

General Diagnostics).

* Verify that other DTCs are not set.

2010 Cadillac Truck SRX AWD V6-3.0L Page 1118

2010 Cadillac Truck SRX AWD V6-3.0L Page 1118

P0103

DTC P0102 or P0103 (LF1)

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 P0102

- Mass Air Flow (MAF) Sensor Circuit Low Frequency

DTC P0103

- Mass Air Flow (MAF) Sensor Circuit High Frequency

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

The mass air flow (MAF) sensor is integrated with the intake air temperature (IAT) sensor. The MAF sensor is an air flow meter that measures the

amount of air entering the engine. The engine control module (ECM) uses the MAF sensor signal to provide the correct fuel delivery for all engine

speeds and loads. A small quantity of air entering the engine indicates a deceleration or idle condition. A large quantity of air entering the engine

indicates an acceleration or high load condition. The MAF/IAT sensor has the following circuits:

* Ignition 1 voltage circuit

* Ground circuit

* MAF sensor signal circuit

* IAT sensor signal circuit

* IAT low reference circuit

The ECM applies 5 V to the MAF sensor on the MAF sensor signal circuit. The sensor uses the voltage to produce a frequency based on the inlet

air flow through the sensor bore. The frequency varies in a range of near 2,000 Hertz at idle to near 10,000 Hertz at maximum engine load.

Conditions for Running the DTC

* The engine is running for more than 1 s.

* The ignition 1 signal is greater than 8 V.

* The above conditions are met for greater than 1 s.

* The DTC runs continuously when the above conditions are met.

Conditions for Setting the DTC

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1762

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1762

* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0220,

P0222, P0223, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0335, P0336, P0351, P0352, P0353, P0501, P0502, P0506, P0507,

P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, P0641, P0651, P1101, P1516, P1682, P2101, P2119, P2120, P2122, P2123,

P2125, P2127, P2128, P2135, P2138, P2176, P2610 are not set.

This DTC runs for 12 s within the first 17 s of start-up, or until the calculated catalyst temperature is greater than 900掳C (1,652掳F). This diagnostic

runs once per trip when a cold start has been determined.

Conditions for Setting the DTC

The actual exhaust energy model does not match the expected exhaust energy model.

Action Taken When the DTC Sets

DTC P1400 is a Type A DTC.

Conditions for Clearing the MIL/DTC

DTC P1400 is a Type A DTC.

Reference Information

Description and Operation

Engine Control Module Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Engine Control

Module Description)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Diagnostic Aids

Any loading of the engine that lowers engine RPM, such as with partial application of the clutch, A/C cycling etc., during the first 17 s of engine

run time may set this DTC.

Circuit/System Verification

1. Allow the engine to cool.

2. Start and idle the engine for at least 2 min.

3. DTC P1400 should run and pass.

Circuit/System Testing

* Inspect the air intake system for the following:

- Damage, restriction, or modification

- Dirty or deteriorating air filter element

- Crankcase ventilation system for correct operation-Refer to Crankcase Ventilation System Inspection/Diagnosis (See: Powertrain

Management/Emission Control Systems/Positive Crankcase Ventilation/Testing and Inspection).

- Water intrusion

- Vacuum leak and other un-metered air downstream of the mass air flow (MAF) sensor

- Intake manifold leak

* Inspect the exhaust system for the following:

- Water intrusion

- Exhaust leak

- Damaged, restricted, modified or enhanced exhaust system-Refer to Symptoms - Engine Exhaust (See: Engine, Cooling and

Exhaust/Exhaust System/Testing and Inspection/Symptoms - Engine Exhaust).

* Inspect the engine mechanical for items that could alter the air flow into the combustion chamber. Refer to Symptoms - Engine Mechanical (

See: Engine, Cooling and Exhaust/Engine/Testing and Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Mechanical).

Repair Instructions

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

2010 Cadillac Truck Escalade RWD V8-6.2L Page 1854

2010 Cadillac Truck Escalade RWD V8-6.2L Page 1854

* DTCs P0030, P0036, P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0117, P0118, P0120, P0121, P0128, P0130, P0131, P0132,

P0133, P0134, P0135, P0136, P0137, P0138, P0140, P0141, P0201-P0208, P0220, P0300, P0301-P0304, P0442, P0443, P0446, P0449,

P0452, P0453, P0455, P0496, P1106, P1107, P1114, P1115, P1133, P1516, P2101, P2119, P2120, P2125, P2135, P2138, P2176 are not set.

* The engine is in Closed Loop status.

* The engine coolant temperature (ECT) is between -40 and +150掳C (-40 and +302掳F).

* The intake air temperature (IAT) is between -20 and +150掳C (-4 and +302掳F).

* The manifold absolute pressure (MAP) is between 10-255 kPa (1.45-37 psi).

* The vehicle speed is less than 134 km/h (83 mph).

* The engine speed is between 375-7,000 RPM.

* The mass air flow (MAF) is between 1-510 g/s.

* The barometric pressure (BARO) is more than 70 kPa (10.2 psi).

* The fuel level is more than 10 %.

* This diagnostic runs continuously when the above conditions have been met.

Conditions for Setting the DTC

* The average long term FT weighted average value is more or less than a calibrated value.

* The above condition is present for approximately 3 min after the Conditions for Running the DTC have been met.

Action Taken When the DTC Sets

The ECM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the ECM stores this information in the

Failure Records. If the diagnostic reports a failure on the second ignition cycle the ECM records the operating conditions at the time of the failure.

The ECM writes the operating conditions to the Freeze Frame and updates the Failure Records. The ECM illuminates the malfunction indicator

lamp (MIL) when one of the following occur:

* The ECM detects the same fuel trim failure during 2 consecutive trips.

* The ECM detects any fuel trim failure during any subsequent trip if the conditions at the time of failure meet the following criteria:

- The engine load is within 20 % of the previous test that failed.

- The engine speed is within 375 RPM of the previous test that failed.

- The engine coolant temperature is in the same range of the previous test that failed.

Conditions for Clearing the MIL/DTC

* The ECM turns OFF the malfunction indicator lamp (MIL) at the beginning of the fourth ignition cycle, after 3 ignition cycles that the

diagnostic runs and does not fail.

* A current DTC, Last Test Failed, clears when the diagnostic runs and passes.

* A history DTC and related Freeze Frame data clears after 40 warm-up cycles, if no failures are reported by this or any other emission related

diagnostic.

* Clear the MIL and the DTC with a scan tool.

Reference Information

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

* Disregard any transmission symptoms, antilock brake system (ABS) indicators, and traction control system (TCS) indicators until any fuel

trim faults are repaired. A fuel trim fault may cause default actions such as harsh shifts and illumination of the ABS/TCS indicators.

* E85 compatible engine only-Over estimation of the ethanol content will result in a rich shift of fuel trim values, and under-estimation will

result in a lean shift of fuel trim values. A fuel trim DTC may set if the learned alcohol content, Fuel Alcohol Content parameter on the scan

tool, is different than the measured alcohol content in the vehicle such that fuel trim values exceed failure threshold values. Refer to Fuel

Composition Diagnosis (See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and

General Diagnostics).

* Verify that other DTCs are not set.

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1859

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1859

* Before the ECM can report DTC P2227 failed, DTCs P0100, P0101, P0102, P0103, P0111, P0112, P0113, P0114, P0121, P0122, P0123,

P0221, P0222, P0223, P0236, P0237, P0238, P2228, and P2229 must run and pass.

* The engine is operating.

* The engine speed is less than 1,120 RPM.

* The throttle position sensor parameter is less than 10 %.

* DTC P2227 runs whenever the above conditions are met.

P2228 or P2229

* The ignition is ON.

* The DTCs run continuously when the above condition is met for 0.2 s.

Conditions for Setting the DTC

P2227

* The ECM detects that the BARO sensor signal plus a calibrated threshold is less than the boost pressure sensor signal plus a calibrated

threshold for more than 9 s.

OR

* The ECM detects that the BARO sensor signal plus a calibrated threshold greater than the boost pressure sensor signal plus a calibrated

threshold for more than 9 s.

OR

* The ECM detects that the BARO pressure changed greater than 5 kPa (0.7 psi) within 20 s.

OR

* The ECM detects that the BARO pressure changed greater than 10 kPa (1.5 psi) since the last ignition cycle.

P2228

* The ECM detects that the BARO sensor voltage is less than 0.20 V for 0.5 s.

OR

* The ECM detects that the BARO sensor signal is less than 45 kPa (6.5 psi) for 2 s

P2229

* The ECM detects that the BARO sensor voltage is greater than 4.8 V for 0.5 s.

OR

* The ECM detects that the BARO sensor signal is greater than 115 kPa (16.7 psi) for 2 s.

Action Taken When the DTC Sets

DTCs P2227, P2228, and P2229 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P2227, P2228, and P2229 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. Start the engine. Observe the DTC information with a scan tool. DTCs P2227, P2228, or P2229 should not set.

2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Inspect the atmospheric vent on the K20 ECM case for one of the following conditions:

* Moisture in the vent inlet

* Debris in the vent inlet

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1786

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1786

* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0220,

P0222, P0223, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0335, P0336, P0351, P0352, P0353, P0501, P0502, P0506, P0507,

P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, P0641, P0651, P1101, P1516, P1682, P2101, P2119, P2120, P2122, P2123,

P2125, P2127, P2128, P2135, P2138, P2176, P2610 are not set.

This DTC runs for 12 s within the first 17 s of start-up, or until the calculated catalyst temperature is greater than 900掳C (1,652掳F). This diagnostic

runs once per trip when a cold start has been determined.

Conditions for Setting the DTC

The actual exhaust energy model does not match the expected exhaust energy model.

Action Taken When the DTC Sets

DTC P1400 is a Type A DTC.

Conditions for Clearing the MIL/DTC

DTC P1400 is a Type A DTC.

Reference Information

Description and Operation

Engine Control Module Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Engine Control

Module Description)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Diagnostic Aids

Any loading of the engine that lowers engine RPM, such as with partial application of the clutch, A/C cycling etc., during the first 17 s of engine

run time may set this DTC.

Circuit/System Verification

1. Allow the engine to cool.

2. Start and idle the engine for at least 2 min.

3. DTC P1400 should run and pass.

Circuit/System Testing

* Inspect the air intake system for the following:

- Damage, restriction, or modification

- Dirty or deteriorating air filter element

- Crankcase ventilation system for correct operation-Refer to Crankcase Ventilation System Inspection/Diagnosis (See: Powertrain

Management/Emission Control Systems/Positive Crankcase Ventilation/Testing and Inspection).

- Water intrusion

- Vacuum leak and other un-metered air downstream of the mass air flow (MAF) sensor

- Intake manifold leak

* Inspect the exhaust system for the following:

- Water intrusion

- Exhaust leak

- Damaged, restricted, modified or enhanced exhaust system-Refer to Symptoms - Engine Exhaust (See: Engine, Cooling and

Exhaust/Exhaust System/Testing and Inspection/Symptoms - Engine Exhaust).

* Inspect the engine mechanical for items that could alter the air flow into the combustion chamber. Refer to Symptoms - Engine Mechanical (

See: Engine, Cooling and Exhaust/Engine/Testing and Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Mechanical).

Repair Instructions

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

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1340

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1340

* DTC P0100, P0101, P0102, P0103, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0418, P050C, P2227, P2228, P2229,

P2257, or P2258 is not set.

* Greater than 60 min has elapsed since the last cold start.

* The secondary air injection system has been commanded ON and OFF during the ignition cycle.

* The battery voltage is between 10-18 V.

* The engine speed is between 680-3,500 RPM.

* The Intake Air Temperature (IAT) is between -12 to +80掳C (10.4-176掳F).

* The Engine Coolant Temperature (ECT) is between -10.5 to +69.8掳C (13-158掳F).

* The Mass Air Flow (MAF) is less than 100 g/s.

* Catalyst heating is active.

* The Barometric Pressure (BARO) is less than 68 kPa (9.9 psi).

* The difference between intake air temp and engine coolant start temp is less than 15掳C (27掳F).

* DTC P0411 runs once per ignition cycle when the above conditions are met.

Conditions for Setting the DTC

* The ratio of the calculated secondary air mass flow to the modeled secondary air mass flow is less than 0.75 or greater than 1.2.

* DTC P0411 sets within 60 s when the above condition is met.

Action Taken When the DTC Sets

DTC P0411 is a Type B DTC.

Conditions for Clearing the DTC

DTC P0411 is a Type B DTC.

Reference Information

Schematic Reference

Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Secondary Air Injection System Description (See: Powertrain Management/Emission Control Systems/Air Injection/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Note: Do not run secondary air injection pump for more than 1-2 minutes at a time. Running for an extended period of time without allowing

pump to cool may cause damage to the pump.

1. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P2431, P2432, or P2433 is not set.

瀚慖f a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble

Code (DTC) List - Vehicle) for further diagnosis.

2. Observe the scan tool Secondary Air Injection Pressure Sensor voltage parameter. The reading should be between 1.0-4.0 V.

3. Compare the scan tool BARO pressure parameter to the Altitude Versus Barometric Pressure (See: Powertrain Management/Computers and

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1867

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1867

* DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0335, or P0336 is not set.

* The engine speed is between 400-7,000 RPM.

* The engine coolant temperature (ECT) is between 69-127掳C (156-260掳F).

* The intake air temperature (IAT) is between -20 to +125掳C (-4 to +257掳F).

* The DTC runs continuously when the above conditions are met.

P0122, P0123, P0222, P0223

* DTC P06A3 is not set.

* The ignition is ON, or the engine is running.

* The engine is not operating in reduced power mode.

* The ignition voltage is greater than 6 V.

* The DTCs runs continuously when the above condition are met.

P2135

* DTCs P0121, P0122, P0123, P0222, P0223, or P06A3 are not set.

* The ignition is ON, or the engine is running.

* The engine is not operating in reduced power mode.

* The ignition voltage is greater than 6 V.

* The DTCs runs continuously when the above conditions are met.

Conditions for Setting the DTC

P0121

The ECM detects that the TP sensor 1 voltage is stuck in range for less than 1 s.

P0122

The ECM detects that the TP sensor 1 voltage is less than 0.3 V for less than 1 s.

P0123

The ECM detects that the TP sensor 1 voltage is greater than 4.8 V for less than 1 s.

P0222

The ECM detects that the TP sensor 2 voltage is less than 0.3 V for less than 1 s.

P0223

The ECM detects that the TP sensor 2 voltage is greater than 4.6 V for less than 1 s.

P2135

The ECM detects that TP sensor 1 and TP sensor 2 disagree greater than 7-10 percent for less than 1 s.

Action Taken When the DTC Sets

P0121

* DTC P0121 is a type B DTC.

* The ECM commands the throttle actuator control (TAC) system to operate in a Reduced Engine Power mode.

P0122, P0123, P0222, P0223, or P2135

* DTC P0122, P0123, P0222, P0223, and P2135 are type A DTCs.

* The ECM commands the throttle actuator control (TAC) system to operate in a Reduced Engine Power mode.

Conditions for Clearing the DTC

* DTC P0121 is a type B DTC.

* DTCs P0122, P0123, P0222, P0223 and P2135 is a type A DTC.

Diagnostic Aids

* If the Throttle Sweep Test is not available on the scan tool, observe the scan tool TP Sensor 1 and 2 Agree/Disagree parameter while

performing the following tests:

- Slowly depress the accelerator pedal to WOT and then slowly return the pedal to closed throttle. Repeat the procedure several times.

- Rapidly depress the accelerator pedal from the rest position to the wide open throttle position (WOT) and release pedal. Repeat the

procedure several times.

The TP Sensor 1 and 2 Agree/Disagree parameter should display Agree. If Disagree is displayed, continue diagnosis in Circuit/System

2010 Cadillac Truck Escalade AWD V8-6.2L Page 2138

* DTC P0101, P0102, P0103, P0641, or P0651 is not set.

* The engine is cranking or running.

* DTC P0340 runs continuously when the above conditions are met.

Conditions for Setting the DTC

Note: The ECM detects engine movement by sensing the airflow through the MAF sensor, when airflow is greater than 3 grams per second, or by

sensing crankshaft position sensor pulses.

* The ECM detects that the starter is commanded on and the engine has been cranking for more than 4 s without a camshaft position sensor

pulse.

* The ECM detects that the engine has started, but did not receive a camshaft position sensor pulse during the first engine revolution.

* The ECM detects that the engine is running, but does not receive a camshaft position sensor pulse for 800 of 1000 engine cycles.

Action Taken When the DTC Sets

* DTC P0340 is a Type B DTC.

* The camshaft position actuator if equipped is commanded to the parked position.

* The ignition system defaults to a failed camshaft position sensor limp home mode.

Conditions for Clearing the DTC

DTC P0340 is a Type B DTC.

Diagnostic Aids

* With a DTC set, the engine may crank for an extended period of time during start-up.

* This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test (See:

Starting and Charging/Testing and Inspection/Component Tests and General Diagnostics/Battery Inspection/Test).

Reference Information

Schematic Reference

Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Electronic Ignition System Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Electronic

Ignition System Description)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Special Tools

J 35616-A/BT-8637 Connector Test Adapter Kit

Circuit/System Verification

1. Engine idling, observe the scan tool Camshaft Position Active Counter parameter. The parameter should be incrementing.

2. Engine idling, observe the DTC information with a scan tool. DTC P0340 should not set.

3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

2010 Cadillac Truck Escalade ESV AWD V8-6.2L Page 1955

2010 Cadillac Truck Escalade ESV AWD V8-6.2L Page 1955

* DTCs P0030, P0036, P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0117, P0118, P0120, P0121, P0128, P0130, P0131, P0132,

P0133, P0134, P0135, P0136, P0137, P0138, P0140, P0141, P0201-P0208, P0220, P0300, P0301-P0304, P0442, P0443, P0446, P0449,

P0452, P0453, P0455, P0496, P1106, P1107, P1114, P1115, P1133, P1516, P2101, P2119, P2120, P2125, P2135, P2138, P2176 are not set.

* The engine is in Closed Loop status.

* The engine coolant temperature (ECT) is between -40 and +150锟斤拷C (-40 and +302锟斤拷F).

* The intake air temperature (IAT) is between -20 and +150锟斤拷C (-4 and +302锟斤拷F).

* The manifold absolute pressure (MAP) is between 10-255 kPa (1.45-37 psi).

* The vehicle speed is less than 134 km/h (83 mph).

* The engine speed is between 375-7,000 RPM.

* The mass air flow (MAF) is between 1-510 g/s.

* The barometric pressure (BARO) is more than 70 kPa (10.2 psi).

* The fuel level is more than 10 %.

* This diagnostic runs continuously when the above conditions have been met.

Conditions for Setting the DTC

* The average long term FT weighted average value is more or less than a calibrated value.

* The above condition is present for approximately 3 min after the Conditions for Running the DTC have been met.

Action Taken When the DTC Sets

The ECM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the ECM stores this information in the

Failure Records. If the diagnostic reports a failure on the second ignition cycle the ECM records the operating conditions at the time of the failure.

The ECM writes the operating conditions to the Freeze Frame and updates the Failure Records. The ECM illuminates the malfunction indicator

lamp (MIL) when one of the following occur:

* The ECM detects the same fuel trim failure during 2 consecutive trips.

* The ECM detects any fuel trim failure during any subsequent trip if the conditions at the time of failure meet the following criteria:

- The engine load is within 20 % of the previous test that failed.

- The engine speed is within 375 RPM of the previous test that failed.

- The engine coolant temperature is in the same range of the previous test that failed.

Conditions for Clearing the MIL/DTC

* The ECM turns OFF the malfunction indicator lamp (MIL) at the beginning of the fourth ignition cycle, after 3 ignition cycles that the

diagnostic runs and does not fail.

* A current DTC, Last Test Failed, clears when the diagnostic runs and passes.

* A history DTC and related Freeze Frame data clears after 40 warm-up cycles, if no failures are reported by this or any other emission related

diagnostic.

* Clear the MIL and the DTC with a scan tool.

Reference Information

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

* Disregard any transmission symptoms, antilock brake system (ABS) indicators, and traction control system (TCS) indicators until any fuel

trim faults are repaired. A fuel trim fault may cause default actions such as harsh shifts and illumination of the ABS/TCS indicators.

* E85 compatible engine only-Over estimation of the ethanol content will result in a rich shift of fuel trim values, and under-estimation will

result in a lean shift of fuel trim values. A fuel trim DTC may set if the learned alcohol content, Fuel Alcohol Content parameter on the scan

tool, is different than the measured alcohol content in the vehicle such that fuel trim values exceed failure threshold values. Refer to Fuel

Composition Diagnosis (See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and

General Diagnostics).

* Verify that other DTCs are not set.