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.
Ignition Coil
The ignition coils supply the spark plugs with high voltage to produce sparks. The Engine Control Module (ECM) controls the ignition coils so that sparks are generated at the correct time.
Ignition coils are supplied with 12 V from the engine compartment relax/fusebox and grounded in the ground terminal intended for ignition coils; coils 1 and 2 together, 3 and 4 together.
The ignition coils are controlled by the control signal (5 V) from the Engine Control Module (ECM)
Each ignition coil has an integrated power stage.
The ignition coils are in the spark plug wells above each spark plug.
The Engine Control Module (ECM) can diagnose the ignition coils.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.