2010 Cadillac CTS Sedan AWD V6-3.6L Page 817

2010 Cadillac CTS Sedan AWD V6-3.6L Page 817

Fuel System Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Fuel 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)

Scan Tool Reference

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

DTC Type Reference

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

(DTC) Type Definitions)

Circuit/System Verification

1. Clear the DTC information with a scan tool.

2. Engine operating, raise the engine speed to 2,000 RPM. Observe the DTC information with a scan tool. DTC P029D, P02A1, P02A5,

P02A9, P02AD, or P02B1 should not set.

瀚慖f a DTC failed this ignition, test or replace the appropriate Q17 fuel injector.

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.

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)

P02A9

DTC P029D, P02A1, P02A5, P02A9, P02AD, or P02B1 (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.

* 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 P029D

- Cylinder 1 Injector Leak Detected

DTC P02A1

- Cylinder 2 Injector Leak Detected

DTC P02A5

- Cylinder 3 Injector Leak Detected

DTC P02A9

- Cylinder 4 Injector Leak Detected

DTC P02AD

- Cylinder 5 Injector Leak Detected

DTC P02B1

- Cylinder 6 Injector Leak Detected

2010 Cadillac CTS Sedan AWD V6-3.6L Page 985

2010 Cadillac CTS Sedan AWD V6-3.6L Page 985

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

Circuit/System Verification

1. Observe the DTC information with a scan tool. DTC P029D, P02A1, P02A5, P02A9, P02AD, P02B1, P0627, P0628, P0629, P069E, or

U0109 should 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).

2. Attempt to start and idle the engine.

3. Observe the DTC information with a scan tool. DTCs P0087, P0088, and P0089 should not set.

4. Engine idling, observe the Fuel Rail Pressure Sensor parameter with a scan tool. The pressure should be approximately 3.5-5.5 Mpa (508-798

psi).

5. Command an increase and decrease in fuel rail pressure with a scan tool. Observe the scan tool Fuel Rail Pressure Sensor parameter. The

Fuel Rail Pressure Sensor should increase or decrease with each commanded state.

6. 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

Note: Circuit/System Verification must be performed first or misdiagnosis may result.

1. Ignition ON, observe the scan tool fuel pump control module fuel line pressure sensor parameter. Command an increase in the fuel line

pressure with a scan tool. Verify the fuel line pressure increases to greater than 414 kPa (60 psi) as commanded.

瀚慖f the less than the specified range, refer to Fuel System Diagnosis (See: Powertrain Management/Computers and Control

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

Note: As little as 2 ohm on either circuit of the high pressure fuel pump actuator will cause these DTCs to set. Test the circuits of the high

pressure fuel pump actuator for a high resistance if you suspect a condition.

2. Remove the G18 high pressure fuel pump and visually inspect the lobes on the camshaft for unusual wear.

瀚慖f the lobes appear normal, replace the G18 high pressure fuel pump.

瀚慖f the lobes are worn, replace the camshaft.

Component Testing

Static Test

1. Ignition OFF, disconnect the harness connector at the high pressure fuel pump.

Note: The DMM and test leads must be calibrated to 0 ohm in order to prevent misdiagnosis.

2. Test for 0.35-0.6 ohm at 20掳C (68掳F) of resistance between low control circuit terminal 1 and high control circuit terminal 2.

瀚慖f the resistance is less than 0.3 ohm or greater than 0.6 ohm, replace the high pressure fuel pump.

3. Test for infinite resistance between each terminal and the high pressure fuel pump housing/case.

瀚慖f not the specified value, replace the high pressure fuel pump.

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1213

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1213

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

Circuit/System Verification

Ignition ON, command the fuel pump ON and OFF using the scan tool ECM fuel pump output control. The fuel pump should turn ON and OFF.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the G12 fuel pump.

2. Connect a test lamp between the control circuit terminal 1 and ground.

3. Ignition ON, command the G12 fuel pump ON and OFF with a scan tool. The test lamp should turn ON and OFF, as commanded.

瀚慖f the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K27 fuel pump control

module.

瀚慖f the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace

the K27 fuel pump control module.

4. Ignition OFF, connect a test lamp between the control circuit terminal 1 and the low reference circuit terminal 2.

5. Ignition ON, command the G12 fuel pump ON with a scan tool. The test lamp should illuminate.

瀚慖f the test lamp does not illuminate, test the low reference circuit terminal 2 for a short to voltage or an open/high resistance. If the circuit

tests normal, replace the K27 fuel pump control module.

6. If all circuits test normal, replace the G12 fuel pump.

Repair Instructions

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

* Fuel Tank Fuel Pump Module Replacement - Right Side (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Pump/Service

and Repair/Fuel Tank Fuel Pump Module Replacement - Right Side)

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

and programming

P0232

DTC P0231, P0232, or P023F

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 P0231

- Fuel Pump Control Circuit Low Voltage