Erasing DTCs

HOW TO ERASE EMISSION-RELATED DIAGNOSTIC IN FORMATION
The emission-related diagnostic information can be erased by the following methods.
Selecting "ERASE" in the "SELF-DIAG RESULTS" mode with CONSULT.
Selecting Mode 4 with GST (Generic Scan Tool).
Changing the diagnostic test mode from Diagnostic Test Mode II to Mode I by turning the mode selector on the ECM.

- If the battery is disconnected, the emission-related diagnostic information will be lost after approx. 24 hours.
- Erasing the emission-related diagnostic information using CONSULT or GST is easier and quicker than switching the mode selector on the ECM.

The following data are cleared when the ECM memory is erased.
1. Diagnostic trouble codes
2. 1st trip diagnostic trouble codes
3. Freeze frame data
4. 1st trip freeze frame data
5. System readiness test (SRT) codes
6. Test values
7. Others
Actual work procedures are explained using a DTC as an example. Be careful so that not only the DTC, but all of the data listed above, are cleared from the ECM memory during work procedures.