Clearing Diagnostic Trouble Codes

Stored trouble codes in the ECM memory can be cleared by removing battery voltage from the ECM. To do this on S/T 10-15 models, turn ignition "Off," then remove battery positive cable or remove ECM fuse for ten seconds. On all other models, turn ignition "Off," then disconnect ECM harness from positive battery pigtail for 30 seconds. Trouble codes should be cleared after any repairs have been made performed. To prevent damaging the ECM, the ignition switch must be in the "Off" position when disconnecting or reconnecting power to the ECM.

After the ECM memory has been cleared, a change may be noted in vehicle performance. To restore normal vehicle performance, drive with engine at normal operating temperature at part throttle, moderate acceleration and idle conditions until normal performance is restored.