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.
Basic Test Procedures
Diagnosis of the CCC system is done in the following order:
- Ensure that all engine systems NOT related to the CCC are fully operational. Do not proceed with testing unless you are sure all other problems have been fixed.
- Enter diagnostic mode and record trouble codes flashed by "CHECK ENGINE" light. Exit diagnostic mode.
- Distinguish between "hard" or "intermittent" trouble codes.
- If trouble codes were displayed, go to Diagnostic Circuit Check chart. Follow instructions given there.
- If no trouble codes were recorded, go to Drive Complaint Sheet and follow instructions given there.
- After any repairs are made, perform System Performance Check. Clear any trouble codes.
The ECM stores component failure information for CCC system under a related trouble code which can be recalled for diagnosis and repair. When recalled, these codes will be displayed by flashes of "CHECK ENGINE" lamp. Codes are displayed starting with lowest numbered code. Only codes in which a related malfunction has occurred will be displayed.
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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.