Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Continuous Monitor (Wiggle) Test
The Self-Test Output (STO) will be activated each time a fault is detected. If the STO is activated long enough during the wiggle tests a service code will be stored. A fault is indicated by a 10.5-volt or greater deflection on VOM. STAR tester LED turns off.
- KEY ON/ENGINE OFF (KOEO) Test: With SELF-TEST deactivated, turn ignition on to enter into wiggle mode.
- KEY ON/ENGINE RUNNING (KOER) Test: Activate SELF-TEST and perform KOER SELF-TEST. After service code output has finished, do not turn engine off or deactivate SELF-TEST. About 2 minutes after code 11 has been displayed, wiggle mode will start. The system will remain in wiggle mode until SELF TEST is deactivated or engine is turned off.
- Observe VOM while moving, wiggling, and tapping the system harness (in short sections), connectors, and sensors. If an intermittent condition is created, the monitor will indicate this by storing a service code. Carefully inspect harness and associated connectors of affected circuits.
- If an intermittent condition is not created, carefully disconnect sensor from harness. Remove terminals from connector and visually inspect terminals at both ends for corrosion, bad crimps, improperly seated terminals, etc.
- Reconnect harness after inspection. Disconnect processor from harness as carefully as possible. Remove and inspect terminals associated with sensor being checked.
- If an intermittent condition cannot be created, reconnect connector and erase the CONTINUOUS SELF-TEST service codes. To erase service codes, activate KEY ON/ENGINE OFF (KOEO) SELF-TEST .
- Remove jumper from Self-Test Input terminal as soon as first service code appears. Repeat SELF-TEST with jumper to verify that service codes have been erased. QUICK TEST is complete.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.