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.
Electronic Ignition System Diagnosis (2.2L): Description
The Ignition Control (IC) module has independent power and ground circuits. The circuits between IC module and Powertrain Control Module (PCM) consist of the following:
- Low reference circuit.
- Low resolution engine speed signal.
- Two IC timing control signals for cylinders No. 1 and 4, and for cylinders No. 2 and 3.
IC module and PCM use low resolution engine speed signal to control ignition operation. Low resolution engine speed signal is derived from Crankshaft Position (CKP) sensor, which is connected directly to IC module.
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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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