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
PCM control dwell and spark timing during all engine running conditions. The Electronic Ignition (EI) module charges the coil pack when the PCM supplies 5 volts to the 1/4 coil. The coil will then discharge or fire through its secondary coil towers whenever the voltage has been turned off by the PCM.
During long cranking, PCM pulses the Ignition Control (IC) circuit high and low. The PCM monitors the diagnostic feedback circuit to diagnose circuit faults. DTC will set if there is short to ground in IC circuits No. 1 and 4 during crank or run mode. Diagnostics runs continuously when engine is cranking or running.
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.
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