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.
Testing & Diagnosis
The C(3)I ignition system is an integral part of the engine's Computer Command Control (CCC) system. For more information, refer to the appropriate article in the ENGINE PERFORMANCE section. See below:
- For CCC tests with codes, go to: 3.0L VIN [L] & 3.8L VIN [3&7] PFI CEC TESTS W/CODES
- For "A", "B", or "C", charts see: 3.0L VIN [L] & 3.8L VIN [3&7] PFI CEC TESTS W/CODES
- For component tests, go to: 3.0L VIN [L] & 3.8L VIN [3&7] PFI CEC COMP TESTS
- For component removal & installation, see: CCC COMPONENTS REMOVAL & INSTALLATION
- For CCC theory & operation, go to: CCC THEORY/OPERATION
If engine cranks but will not run or if it stalls, CHART A-3 must be used to determine if failure is in the C(3)I ignition system or fuel injection system.
If either Code 41 or Code 42 (E041 or E042 on some models) is set, use appropriate chart for proper diagnosis. If symptom is an engine miss and the C(3)I ignition system is suspected, CHART C-4F must be used. For "C" charts go to: 3.0L VIN [L] & 3.8L VIN [3&7] PFI CEC TESTS W/CODES
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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.