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 deflection on VOM. The STAR tester LED will flash and/or sound an alert signal when fault is recreated. The CONTINUOUS MONITOR (WIGGLE) TEST is used to attempt to recreate an intermittent fault.
- KEY ON/ENGINE OFF (KOEO) Test: With SELF-TEST deactivated, turn ignition on to enter into wiggle test mode. Tap, move, and wiggle the suspected sensor and/or harness (in short sections). If a fault is detected, a service code will be stored in memory and will be indicated by VOM or diagnostic tester. Retrieve code and perform test indicated in CONTINUOUS SELF-TEST table.
- KEY ON/ENGINE RUNNING (KOER) Test: Start engine. Activate SELF-TEST, wait 10 seconds, deactivate, and then reactivate SELF-TEST. DO NOT turn engine off. You are now in KOER wiggle test mode. Tap, move, and wiggle the suspected sensor and/or harness (in short sections). If a fault is detected, a service code will be stored in memory and will be indicated by VOM or diagnostic tester. Retrieve code and perform test indicated in CONTINUOUS SELF-TEST table.
- Observe VOM while moving, wiggling, and tapping 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 ECA from harness as carefully as possible. Remove and inspect terminals associated with sensor being checked.
- If an intermittent condition cannot be created, plug-in connector and erase the CONTINUOUS SELF-TEST service codes. To erase service codes, activate KEY ON/ENGINE OFF (KOEO) SELF-TEST .
- Remove jumper wire from Self-Test Input (STI) terminal as soon as first 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.
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