Clearing Trouble Codes

Trouble codes should be cleared after repairs have been made. Some diagnostic charts will tell you to clear codes before using the flow chart. This allows ECM to set the code while going through flow chart, which will help to find cause of problem more quickly.

Turn ignition switch to "ON" position and ground diagnostic test terminal at ALCL connector. Turn ignition off and remove ECM fuse from fuse block for 10 seconds or more. Remove test lead from ALCL connector.