2010 Cadillac Truck SRX FWD V6-3.0L Page 1302

2010 Cadillac Truck SRX FWD V6-3.0L Page 1302

* 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 Testing

1. Read and record the Freeze Frame/Failure Records data taking note of the speed and load at which the DTC set.

2. Diagnose any other DTCs that are set. Refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

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

3. With the engine idling and the transmission in the Park or Neutral position, observe the manifold absolute pressure (MAP) sensor parameter.

The MAP sensor parameter should be between 20-48 kPa (2.9-7.0 psi).

瀚慖f the MAP sensor parameter is not between 20-48 kPa (2.9-7.0 psi), refer to DTC P0106 (LF1) (See: P Code Charts/P0106) or DTC

P0107 or P0108 (LF1) (See: P Code Charts/P0107).

4. Inspect the air induction system for modified, damaged, leaking, or restricted components.

5. Inspect the crankcase ventilation system for improper operation.

6. Inspect the vacuum hoses for splits, kinks, and improper connections.

7. Inspect for vacuum leaks at the intake manifold, the throttle body, and the injector O-rings.

8. Test for a restricted, damaged, leaking, or modified exhaust system from the catalytic converter forward. Refer to Symptoms - Engine

Exhaust (See: Engine, Cooling and Exhaust/Exhaust System/Testing and Inspection/Symptoms - Engine Exhaust).

9. Test the fuel injectors for improper operation. Refer to Fuel Injector Solenoid Coil Test (LAU) (See: Powertrain Management/Fuel Delivery

and Air Induction/Fuel Injector/Testing and Inspection)Fuel Injector Solenoid Coil Test (LF1, LFW) (See: Powertrain Management/Fuel

Delivery and Air Induction/Fuel Injector/Testing and Inspection).

10. Test for fuel contamination. Refer to 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))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)).

11. Test for excessive fuel in the crankcase due to leaking injectors.

12. Test the ignition system for improper operation. Refer to Electronic Ignition System Diagnosis (See: Powertrain Management/Computers

and Control Systems/Testing and Inspection/Component Tests and General Diagnostics/Electronic Ignition System Diagnosis).

13. Test the engine for any mechanical conditions such as sticking valves, lifters, etc., which could alter the 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. Verify the repair under the same

speed and load as noted in the Freeze Frame/Failure Records data recorded during testing.

P0222

DTC P0121-P0123, P0222, P0223, or P2135 (LF1, LFW)

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 P0121

- Throttle Position Sensor Performance

DTC P0122

- Throttle Position Sensor 1 Circuit Low Voltage