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.
Circuit Description
The electronic ignition system uses an individual ignition coil for each cylinder. The PCM controls ignition operation through 8 individual Ignition Control (IC) circuits. Each bank of 4 ignition coils is connected to PCM, power or ground by low reference, chassis ground, ignition 1 voltage circuits and appropriate IC circuit. PCM triggers an ignition coil by grounding appropriate IC circuit using information from Crankshaft Position (CKP) and Camshaft Position (CMP) sensors. The CMP sensor is located on top center rear of engine and CKP sensor is located on engine block, near starter. See Figure or Figure .
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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.