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.
Direct Ignition System
PCM sends sequential low current signals (one for each coil) to the Ignition Control Module (ICM). ICM in turn grounds each coil in proper sequence and time. Spark plugs are fired directly by coils mounted on each spark plug.
PCM uses input signals from Top Dead Center (TDC), Cylinder Position (CYP) and Crankshaft Position (CKP) sensors for basic ignition timing. In addition, ignition timing is influenced by throttle position sensor, coolant temperature sensor and MAP sensor.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.