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 Procedure: Notes
Diagnostic test procedures are designed to detect system faults as quickly as possible. Body fault codes are accessed through CCD bus diagnostic connector. See Figure . DRB-II tester is used to access information from CCD bus diagnostic connector.
DRB-II tester, 1991 diagnostic program cartridge, body diagnostic cable, jumper wires, analog volt/ohmmeter and oil pressure gauge will be needed for testing. Proceed to TEST 1A - IDENTIFYING VEHICLE EQUIPMENT & SYSTEM PROBLEMS in TROUBLE SHOOTING CHARTS. When system problem is identified according to customer complaint, perform indicated diagnostic test.
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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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