Circuit Description
The powertrain control module (PCM) has the ability to determine the amount of offset needed to bring the engine to top dead center (TDC). This is used by the PCM to determine proper injection time.
Conditions for Running the DTC
The ignition is in the ON position.
Conditions for Setting the DTC
| • | TDC offset more than 2.46 degrees |
| or |
| • | TDC Offset less than -2.46 degrees |
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records. |
Conditions for Clearing the DTC
| • | A current DTC Last Test Failed clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic. |
| • | Clear the DTC with a scan tool. |
Diagnostic Aids
The PCM will only run the diagnostic test if the TDC offset adjustment time set procedure has been activated. The vehicle will most likely not be brought in with this DTC set. Refer to Fuel Injection Pump Top Dead Center Offset Adjustment .
Step | Action | Values | Yes | No | ||||
|---|---|---|---|---|---|---|---|---|
1 |
Important: Before clearing the DTCs, use the scan tool Capture Info to save the Freeze Frame/Failure Records for reference. The data in the control module is deleted once the Clear Info function is used. Did you perform the Diagnostic System Check-Engine Controls? | -- | Go to Step 2 | |||||
2 | Are there any other DTCs set? | -- | Go to Step 3 | |||||
3 | Clear all of the codes and reset the injection timing until the TDC offset is between the specified values. Refer to Fuel Injection Pump Top Dead Center Offset Adjustment . Is the timing within the specified value? | -0.25 to -0.75 | Go to Step 6 | Go to Step 4 | ||||
4 |
Did you perform a repair? | -- | Go to Step 6 | Go to Step 5 | ||||
5 |
Important: The new injection pump must be timed. Replace the fuel injection pump. Refer to Fuel Injection Pump Replacement and to Fuel Injection Pump Timing Adjustment . Did you complete the replacement? | -- | Go to Step 6 | -- | ||||
6 |
Does the scan tool indicate the diagnostic passed? | -- | Go to Step 7 | Go to Step 2 | ||||
7 | Does the scan tool display any additional undiagnosed DTCs? | -- | System OK |
