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 Aids
An intermittent problem may be caused by a poor connection, rubbed through wire insulation, or a wire broken inside insulation. Frequency of problem can be checked by using Enhanced Diagnostic feature of Tech 1.
Any circuit that is suspected of causing intermittent problem should be checked thoroughly for backed-out terminals, improper mating, broken connector locks, damaged terminals, or poor terminal to wiring connections.
Verify proper brake switch operation using Data List feature of Tech 1. As brake is applied within one inch of pedal travel, Data List feature should indicate brake switch on.
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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.