Diagnostic trouble codes can be cleared from the memory with the use of a scan tool. Please follow the scan tool manufacturer's instructions for connecting the tool and information on clearing codes. If a scan tool is not available, trouble codes may be cleared by placing the PCM in diagnostic test mode and Do not disconnect the negative battery cable to clear these codes. A new code will be stored for loss of PCM power.1993-98 Vehicles
Although the use of a scan tool is highly recommended, DTCs can be cleared on 1993-98 vehicles using the following procedure:
- Turn the ignition switch on, but leave the engine OFF .
- Check to make sure that the MIL is illuminated.
- Disconnect the diagnostic connector located on the driver's side of the engine compartment.
- Connect a jumper wire between the two terminals. Please refer to the graphics for the proper terminal locations.
- Wait for at least two seconds, then remove the jumper wire and reconnect the connector. The PCM is now in diagnostic test mode.
- Disconnect the diagnostic connector and reconnect the jumper wire to the same terminals.
- Wait for at least two seconds, then remove the jumper wire and reconnect the connector. The codes should now be cleared.
- Turn the ignition switch OFF .
Although the use of a scan tool is highly recommended, DTCs can be cleared on 1999-00 vehicles by accessing the PCM test mode selector in the PCM. Please refer to the chart for instructions on erasing diagnostic information.KEEP ALIVE MEMORY (KAM)
The Keep Alive Memory (KAM) should not be routinely cleared during diagnosis. If a fuel injector or the fuel pressure regulator is replaced, the KAM must be cleared. Failure to clear the KAM may cause severe driveability problems since the correction factor for the old component will be applied to the new component.
To clear the KAM, disconnect the negative battery cable for at least 24 hours. After the memory is cleared and the battery reconnected, the vehicle must be driven at least 10 miles so that the processor may relearn the needed correction factors. The distance to be driven depends on the engine and vehicle, but all drives should include steady-throttle cruise on open roads. Certain driveability problems may be noted during the drive because the correction factors are not yet functioning.