Self-Diagnostic Test
- Turn ignition switch to "OFF" position. Connect voltmeter to self-diagnostic output harness connector located in engine compartment. See Fig 1 .
- Turn ignition switch to "ON" position and ECU will display code(s). Record any abnormal diagnostic codes and perform necessary component repairs. After checking and repair, turn ignition off and disconnect negative battery cable for 15 seconds or more to erase ECU memory.
NOTE:
Oxygen sensor memory is erased when ignition is turned off. To diagnose oxygen sensor, drive vehicle a good distance and keep engine running.