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.
Self-Diagnostic System: Introduction
The diagnostic procedures are based on the failure condition or symptom being present at the time of diagnosis. Follow the recommendations listed when choosing your diagnostic path.
- First make sure the DRBIII(R) is communicating with the appropriate modules; i.e., if the DRBIII(R) displays a NO RESPONSE or a BUS - SIGNALS OPEN condition, you must diagnose communications faults first.
- Read DTC's with the DRBIII(R).
- If no DTC's are present, identify the customer complaint.
- Once the DTC or customer complaint is identified, locate appropriate test in DIAGNOSTIC TROUBLE CODE IDENTIFICATION or SYMPTOM IDENTIFICATION tables. When repairs are required, see appropriate article for component or system for the proper removal and repair procedure.
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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