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: Injector 1 Calibration IncorrectDTC P268D: Injector 2 Calibration Incorrect
DTC P268E: Injector 3 Calibration Incorrect
DTC P268F: Injector 4 Calibration Incorrect
DTC P2690: Injector 5 Calibration Incorrect
DTC P2691: Injector 6 Calibration Incorrect
DTC P2692: Injector 7 Calibration Incorrect
DTC P2693: Injector 8 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's flow rate is measured and recorded as injection quantity adjustment (IQA) flow rate data. The flow rate data is then etched as a hexadecimal number on the body of the injector. This data, together with the injector's cylinder position, is stored in the memory of both the glow plug control module (GPCM) and the ECM. When the ignition is turned ON, the GPCM and the ECM compare the IQA Data . If any of the injector flow rate numbers are incorrect in either of the control modules, this diagnostic will set the appropriate DTC.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
The fuel injector calibration flow rate data is incorrect .
Action Taken When the DTC Sets
DTCs P268C, P268D, P268E, P268F, P2690, P2691, P2692 and P2693 are Type A DTCs.
Conditions for Clearing the DTC
DTCs P268C, P268D, P268E, P268F, P2690, P2691, P2692 and P2693 are Type A DTCs.
Reference Information
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Review the Display ECM & GPCM Inj. Flow Rates function with a scan tool. All cylinders should be programmed with a flow rate number. Both the GPCM and the ECM should be programmed with the same flow rate numbers for the corresponding cylinders.
- Engine running, observe the DTC information with a scan tool. DTCs P268C, P268D, P268E, P268F, P2690, P2691 or P2693 should not set.
- Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
| ⇒ | If flow rate numbers are incorrect, refer to Fuel Injector Flow Rate Programming . |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
