With Check Engine Light

NOTE: Using this procedure, the technician can attempt to recreate and detect an intermittent fault.

KEY ON ENGINE OFF

1. Ensure the ignition switch is in the OFF position and connect a scan tool to the diagnostic connector.
2. Turn the ignition key to the ON position.

Jumper Wire Installed Between Pin #2 And Self Test Input (STI):

3. ACTIVATE, DEACTIVATE, and REACTIVATE the self-test by grounding, ungrounding, and re-grounding the 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, ECA will set a code and signal a fault by flashing the CHECK ENGINE light..
5. To exit the wiggle test mode, DEACTIVATE the self test and turn the key OFF.

KEY ON ENGINE RUNNING

NOTE: The Engine Running (ER) wiggle test may be entered any time the engine is running.

1. Ensure the ignition switch is in the OFF position and connect a scan tool to the diagnostic connector.
2. START the engine, then ACTIVATE, DEACTIVATE, and REACTIVATE the self test. You are now in the engine running wiggle test mode.
NOTE: Do not turn the engine OFF.
3. Tap, move, and wiggle the suspected circuits sensors and wiring. When a fault is detected, ECA will set a code and signal a fault.
NOTE: If any codes are set, perform the appropriate pinpoint test.
4. To exit the wiggle test mode, DEACTIVATE the self test and turn the key OFF.