With Malfunction Indicator Light or Analog Voltmeter

KEY ON ENGINE OFF WIGGLE TEST
1. Ensure the ignition switch has been "OFF" for at least 10 seconds.
2. Turn the ignition key "ON".

Data Link Connector (DLC):

Analog Voltmeter Connection:

Key On Engine OFF (KOEO) Diagnostic Trouble Code Format:

3. Activate, deactivate, and reactivate the self-test by grounding, ungrounding, and re-grounding the Self-Test Input (STI) connector. You are now in the wiggle test mode.
4. Tap, move, and wiggle the suspected circuits sensors and wiring. When a fault is detected, the Powertrain Control Module (PCM) will set a code and signal a fault by flashing the malfunction indicator light light and by briefly energizing the Self-Test Output (STO) circuit (resulting in a needle deflection if an analog voltmeter is being used.
5. To exit the wiggle test mode, deactivate the self test and turn the key "OFF".

KEY ON ENGINE RUNNING WIGGLE TEST
1. Ensure the ignition switch is "OFF".
2. Start the engine, then activate, deactivate, and reactivate the self test. You are now in the engine running wiggle test mode.
3. Tap, move, and wiggle the suspected circuits sensors and wiring. When a fault is detected, the PCM will set a code and signal a fault.
4. To exit the wiggle test mode, deactivate the self test and turn the key OFF.

NOTES

- This test is intended to allow the technician to isolate intermittent faults.

- The Key On Engine Running (KOER) wiggle test may be entered any time the engine is running.

- Turing the ignition "OFF" will terminate the KOER wiggle test.

WHERE TO GO NEXT

- If any codes are set during the wiggle test refer to Diagnostic Trouble Code Diagnostic Charts for appropriate testing procedures. Pinpoint Tests


- If no codes were set then refer to Diagnosis by Symptom (Diagnostic Routines). Symptom Related Diagnostic Procedures