(a) Control Module Diagnosis

Control Module Diagnosis

To read and clear diagnostic trouble codes, use a Tech 2.

IMPORTANT: Use of a Tech 2 is recommended to clear diagnostic trouble codes from the PCM/VCM memory. Diagnostic trouble codes can also be cleared by turning the ignition "OFF" and disconnecting the battery power from the PCM/VCM for 30 seconds. Turning off the ignition and disconnecting the battery power from the PCM/VCM will cause all diagnostic information in the PCM/VCM memory to be cleared. Therefore, all the diagnostic tests will have to be re-run.

In order to clear Diagnostic Trouble Codes (DTCs), use the diagnostic scan tool clear DTCs or clear info function. When clearing DTCs follow the instructions supplied by the tool manufacturer. When a scan tool is not available, disconnecting one of the following sources for at least thirty (30) seconds can also clear the DTCs:

NOTE: Turn OFF the ignition key when disconnecting or reconnecting battery power in order to prevent system damage.

- The power source to the control module. Examples include the following:
- Fuse
- Pigtail at battery Control Module connectors etc.
- The negative battery cable

Disconnecting the negative battery cable may result in the loss of other on-board memory data, such as preset radio tuning.