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.
Step 4.0 Computed Timing Check: Begin
Turn key OFF and wait 10 seconds. Activate self-test procedure (same as previous):
- VOM: Jumper Self-Test Input (STI) single terminal pigtail to SIG RTN terminal at the Self-Test connector. See Figure.
- STAR Tester: Latch the center button in the down position.
- "Check Engine" or "Service Engine Soon" Light (MIL): Jumper Self-Test Input (STI) single terminal pigtail to SIG RTN terminal at the Self-Test connector. See Figure. Service Codes will be flashed on the Light.
- Scan Tool: As described by scan tool manufacturer.
Start engine. The Engine Running (KOER) test will begin. Ignore all codes (ID Code, Dynamic Response Code, etc.) except for Code 98.
Use the Manual With the Right Hardware
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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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