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.
Diagnostic Starting Point
Begin the system diagnosis with the diagnostic system check. See DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM. The diagnostic system check will provide the following information:
- Identification of the control modules which command the system.
- The ability of the control modules to communicate through the serial data circuit.
- Identification of any stored Diagnostic Trouble Codes (DTC) and their status.
The use of the diagnostic system check will identify the correct procedure for diagnosing the system and where the procedure is located. If no DTCs are present, attempt diagnosis by symptom. See SYMPTOM DIAGNOSIS .
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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.