Action Taken When the DTC Sets
WARNING: This page is about a different car, the 2003 Pontiac Montana, 2003 Oldsmobile Silhouette, and 2003 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.
- The PCM does not illuminate the malfunction indicator lamp (MIL).
- The PCM enters PC solenoid valve diagnostic retest mode. The retest mode conducts the following diagnostic routine:
- The PCM de-energized the PC solenoid valve resulting in maximum line pressure.
- After being de-energized for 2 seconds, the PCM commands the PC solenoid valve ON at 0.1 amp for the retest period of 5 seconds.
- If no circuit faults are detected during the 5 second retest period, then the PC solenoid valve is returned to normal operation and DTC P0748 diagnostic is passed.
- If a circuit is detected during the 5 second retest period, then the PCM de-energizes the PC solenoid valve for 2 seconds before reentering the retest mode.
- If a circuit fault is detected 5 times in retest mode without returning to normal operation, then the PC solenoid valve is de-energized for the remainder of that ignition cycle.
- If a circuit fault is detected 3 times during normal operation, then the PCM de-energizes the PC solenoid valve for the remainder of that ignition cycle.
- The PCM freezes transmission adaptive functions.
- The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Failure Records.
- The PCM stores DTC P0748 in PCM history.