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. This is used by the PCM to determine proper injection time.
Conditions for Running the DTC
The ignition switch is in the ON position.
Conditions for Setting the DTC
| • | TDC offset greater than 2.46 degrees |
| or |
| • | TDC Offset less than -2.46 degrees. |
Action Taken When the DTC Sets
| • | The PCM illuminates the malfunction indicator lamp (MIL) on the second consecutive drive trip the diagnostic runs and fails. |
| • | The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the Failure Records store this information. If the diagnostic reports a failure on the second consecutive drive trip, the Freeze Frame records the operating conditions at the time of failure and updates the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The PCM will turn the MIL off after 3 consecutive trips without a fault condition. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures. |
| • | The scan tool Clear Info function was used. |
Diagnostic Aids
The PCM will only run the diagnostic test TDC offset adjustment a time set procedure has been activated. It is highly unlikely that the vehicle will be brought in with this DTC set. Refer to Fuel Injection Pump Top Dead Center Offset Adjustment .
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 |
Important: Before clearing the DTCs, use the Scan Tool Capture Info function to save the Freeze Frame and the Failure records for reference. The control module's data is deleted once the Clear Info function is used. Was the Powertrain On Board Diagnostic (OBD) System Check performed? | -- | ||
2 | Are there any other DTCs set? | -- | Go to the Applicable DTC Table | |
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 | ||
4 | Check the crankshaft position sensor for the following.
Did you perform a repair? | -- | ||
5 |
Important: The new injection pump must be timed. Refer to Fuel Injection Pump Timing Adjustment . Replace the fuel injection pump. Refer to Fuel Injection Pump Replacement . Is the action complete? | -- | -- | |
6 |
Does the scan tool indicate the diagnostic Passed? | -- | ||
7 | Does the scan tool display any additional undiagnosed DTCs? | -- | Go to the applicable DTC Table | System OK |
