For 1990-2009 cars

Use one of the two following methods in order to erase the DTCs in the EBCM memory:

• | The Scan Tool method

• | The drive cycle default method

A drive cycle occurs when the ignition is turned to ON and the vehicle is driven faster than 16 km/h (10 mph).

Verify the proper system operation and the absence of DTCs after completing the clearing procedure.

The following methods will not clear the DTCs:

• | Unplugging the EBCM

• | Disconnecting the battery cables

• | Turning off the ignition switch (except on a drive cycle default)

### Scan Tool Method

Use the following procedure in order to clear the DTCs with the Scan Tool:

1. Select DTCs for Diagnostic Trouble Codes.
2. View the DTCs.
3. The Scan Tool will display the following message: History Data Will Be Lost. Clear DTCs?

Answer YES.

This action will clear the DTCs.

### Drive Cycle Default

Existing DTCs automatically clear from the EBCM memory if no diagnostic trouble codes occur for 100 drive cycles.

A drive cycle occurs when the ignition is turned to ON and the vehicle is driven faster than 16 km/h (10 mph).