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DTC P268C-P268F

DTC P268C-P268F

Diagnostic Instructions


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

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

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


DTC Descriptors

DTC P268C

Cylinder 1 Injector Calibration Incorrect

DTC P268D

Cylinder 2 Injector Calibration Incorrect

DTC P268E

Cylinder 3 Injector Calibration Incorrect

DTC P268F

Cylinder 4 Injector Calibration Incorrect

Circuit/System Description

The control functions for the fuel injection system are integrated in the engine control module (ECM). During the manufacturing process, each injector flow rate is measured and recorded as injection quantity adjustment flow rate data. This data, together with the injectors' cylinder position, is stored in the ECM. When the ignition is turned ON, the ECM monitors the fuel injection flow rate numbers to ensure they are present.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The fuel injector injection quantity adjustment flow rate data is not programmed.

Action Taken When the DTC Sets

DTCs P268C, P268D, P268E and P268F are Type B DTCs.

Conditions for Clearing the DTC

DTCs P268C, P268D, P268E and P268F are Type B DTCs.

Diagnostic Aids

Verify that the ECM has the correct part number for the application.

Circuit/System Verification


1. 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.

2. Perform the Injector Flow Rate Programming

3. Verify that the DTC does not reset.

4. If the DTC is set, replace the K20 Engine Control Module.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Engine Control Module Replacement