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
ECM controls spark timing and dwell (spark on-time) under all engine running conditions. The Electronic Ignition (EI) module has the ability to charge and discharge each of the 2 coil packs independently based on ECM control. ECM uses a high control signal of about 5 volts to charge up the coil and low control signal of about zero volts to discharge the coil. If coil is charged and control signal is low, the coil will fire through it secondary towers.
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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