Malfunction Indicator Lamp: Service and Repair

To clear the DTCs from the memory of the ECM either to determine if the malfunction will occur again or because repair has been completed, the ECM power feed must be disconnected for at least thirty (30) seconds. Depending on how the vehicle is equipped, the ECM power feed can be disconnected at the positive battery terminal "pigtail", the inline fuse holder that originates at the positive connection at the battery, or the ECM fuse in the fuse block. (The negative battery terminal may be disconnected, but other on-board memory data, such as preset radio tuning, will also be lost.)

CAUTION:
- To prevent ECM damage, the key must be "OFF" when disconnecting or reconnecting ECM power.

When using a hand-held diagnostic scanner, or "Scan" tool to read the codes, clearing the DTCs is done in the same manner as in the above procedure.