Was the check engine light on at the time, or did it have codes stored? One note on this procedure, it may reset all of the I/M flags that are necessary to illustrate that the vehicle has run all of the tests.
RESETTING KEEP ALIVE MEMORY (KAM)
Disconnect the battery ground cable for a minimum of 5 minutes.
The PCM Reset clears all emission-related diagnostic information. When resetting the PCM, a Diagnostic Trouble Code (DTC) P1000 will be stored in the PCM until all the OBD II system monitors or components have been tested to satisfy a drive cycle, without any other faults occurring. For more information about a drive cycle, refer to Drive Cycles. See: Monitors, Trips, Drive Cycles and Readiness Codes Drive Cycles
The following events occur when a PCM reset is performed:
Clears the number of Diagnostic Trouble Codes (DTCs).
Clears the DTCs.
Clears the freeze frame data.
Clears diagnostic monitoring test results.
Resets status of the OBD II system monitors.
Sets DTC P1000.
Resetting Keep Alive Memory will return PCM memory to its default setting. Adaptive learning contents such as idle speed, refueling event, and fuel trim are included. A PCM Reset (described above) is also part of a KAM Reset. Both can be useful in post repair retest.
After Keep Alive Memory has been reset, the vehicle may exhibit certain driveability concerns. It will be necessary to drive the vehicle to allow the PCM to relearn values for optimum driveability and performance.
Wednesday, March 16th, 2011 AT 5:11 AM