Clearing Diagnostic Trouble Codes

DIAGNOSTIC TROUBLE CODE CANCELLATION



1. After repair of the trouble area, the diagnostic trouble code retained in memory by the ECM must be cancelled out by removing the EFI fuse (15A) for 10 seconds or more, depending on ambient temperature (the lower the temperature, the longer the fuse must be left out) with the ignition switch OFF.

HINT:
- Cancellation can also be done by removing the negative (-) terminal cable from the battery, but in this case, other memory systems (clock, etc.) will also cancelled out.
- If the diagnostic trouble code is not cancelled out, it will be retained by the ECM and appear along with a new code in the event of future trouble.
- If it is necessary to work on engine components requiring removal of the battery terminal, a check must first be made to see if a diagnostic trouble code has been recorded.

2. After cancellation, road test the vehicle to check that a normal code is now read on the MIL.
If the same diagnostic trouble code appears, it indicates that the trouble area has not been repaired thoroughly.