Clearing Diagnostic Trouble Codes

CAUTION: To avoid component damage, be sure ignition is "OFF" when disconnecting or reconnecting power to the ECM.

After displaying and recording any trouble codes or after making repairs, the ECM memory should be cleared by interrupting the power for at least 30 seconds. This is accomplished by temporarily removing the ECM fuse in the fuse and relay block under the dash or by disconnecting the battery. Depending on how the vehicle is equipped, it may also be possible to interrupt ECM power at the positive battery terminal "pigtail" or with an in-line fuse holder originating at the positive battery terminal. After clearing codes, it may be necessary to reset electronic accessories such as digital clocks and radios.

When using a "Scan" tool, codes are cleared in the same manner.