Clearing Diagnostic Trouble Codes

1. Turn ignition switch to OFF position.
2. Deactivate STAR tester by depressing self-test button. The colon should disappear from the display window.
3. Turn ignition switch to ON position.
4. Activate STAR tester by depressing self-test button. As soon as the tester begins to display service codes (even code 11), deactivate self-test sequence by depressing the self-test button.
5. The colon as well as any service code displayed should disappear from the tester window. Any memory codes held in storage will be erased at this time.
6. Ensure that the memory codes have been erased by turning ignition switch to OFF position and repeating steps 3 and 4. Do not erase intermittent faults from the ECA memory until they have been corrected.

Continuous Memory

NOTE: Do not disconnect battery to clear Continuous Memory Codes. This will erase the Keep Alive Memory (KAM) information which may cause a driveablity concern.

1. Perform Key On Engine Off self-test according to Quick Test Step 3.0.
2. When service codes begin to be displayed, deactivate self-test:
- STAR tester: position center button in up position.
- Analog Volt/Ohmmeter: remove jumper wire from self-test input connector and signal return pin of the self-test connector.
- Check engine light: remove jumper wire from self-test input connector and signal return pin of the self-test connector.
3. Continuous codes should now be erased.

Keep Alive Memory (KAM)

To clear keep alive memory, disconnect negative battery cable for a minimum of five minutes. After clearing memory, it is necessary to drive the vehicle a minimum of 10 miles to allow processor time to relearn values for optimum driveability and performance.