P01CE

DTC P01CC, P01CE, P01D0, P01D2, P01D4, P01D6, P01D8, or P01DA

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P01CC
- Cylinder 1 Injection Timing Advanced

DTC P01CE
- Cylinder 2 Injection Timing Advanced

DTC P01D0
- Cylinder 3 Injection Timing Advanced

DTC P01D2
- Cylinder 4 Injection Timing Advanced

DTC P01D4
- Cylinder 5 Injection Timing Advanced

DTC P01D6
- Cylinder 6 Injection Timing Advanced

DTC P01D8
- Cylinder 7 Injection Timing Advanced

DTC P01DA
- Cylinder 8 Injection Timing Advanced

Circuit/System Description

The engine control module (ECM) has the ability to learn injector timing performance. With the engine at operating temperature and in closed throttle decel mode, the ECM will pulse each injector individually and measure the changes in rotational speed of the crankshaft using the input from the crankshaft position sensor (CPS). The ECM will run this diagnostic under three different fuel rail pressures for each injector. The ECM will adjust the timing of fuel delivered by each injector to obtain the desired RPM increase. The ECM stores the injector timing value required to increase the crankshaft speed by the desired RPM. If the ECM cannot control an increase in RPM for a given injector the appropriate code will set for that injector.

Conditions for Running the DTC

* Ambient air temperature is above -7° C (19° F).

* Fuel temperature is between 0-80° C (32-176° F).

* Engine temperature is greater the 50° C (122° F).

* Battery voltages is greater than 10 V.

* Time since last combustion event is between 5-30 s.

* Intake manifold pressure is between 75-150 kPa.

* Fuel system status is in fuel shut off mode.

* Accelerator pedal position is less than.05 percent.

* Engine speed is between 950-1850 RPM.

* Vehicle speed greater than 0 mph.

* The rail pressure is stable for.10 seconds.

* No gear change has occurred.

* Ambient pressure is above 75 kPa.

* Vehicle is not in 4WD (if equipped).

* No other DTCs are present.

* The DTC runs when the above conditions exists.

Conditions for Setting the DTC

A fault is detected when the corrected energizing time falls below the allowed limit for greater than.01 seconds.

Action Taken When the DTC Sets

DTCs P01CC, P01CE, P01D0, P01D2, P01D4, P01D6, P01D8, and P01DA are Type B DTCs.

Conditions for Clearing the DTC

DTCs P01CC, P01CE, P01D0, P01D2, P01D4, P01D6, P01D8, and P01DA are Type B DTCs.

Diagnostic Aids

* This Diagnostic parameter is stored in the ECM over a period of time. Time to set this code may take several drive cycles.

* Contaminated or improper fuel quality may cause this code to set

* Worn base engine components or differences in cylinder compression may cause this code to set

Reference Information

Schematic Reference

Engine Controls Schematics (LGH or LML) [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)

Description and Operation

Fuel System Description Fuel System Description

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Verify the proper fuel is used. Refer to Fuel System Specifications [1][2]Fuel Delivery and Air Induction and Contaminants-in-Fuel Diagnosis Fuel System Diagnosis.

2. Verify there are no aftermarket performance enhancing devices install on the vehicle.

Circuit/System Testing

Perform a cylinder compression test. Refer to Engine Compression Test Testing and Inspection.

If the engine compression is within specifications replace the appropriate Q17 fuel injector.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic repair.

* Fuel Injector Replacement (Right Side) Fuel Injector Replacement (Right Side)Fuel Injector Replacement (Left Side) Fuel Injector Replacement (Left Side)

* Perform the Fuel Injector Flow Rate Programming Fuel Injector Flow Rate Programming and Fuel Injector Correction Reset Fuel Injector Correction Reset procedures after replacement of a fuel injector.

* Control Module References Control Module References for ECM replacement, programming and setup.