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.
Entering Self-Diagnostics
Vehicle is equipped with an Assembly Line Data Link (ALDL) diagnostic connector, located in passenger compartment.
The ALDL connector is grounded by connecting a jumper wire between terminals "A" (ground) and "B" (diagnostic terminal). See Fig 1 . If the diagnostic terminal is grounded with the ignition switch on and engine off, system will enter diagnostic mode. If the diagnostic terminal is grounded when the engine is running, Key On Engine Running (KOER), system will enter field service mode.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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