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
There are 2 separate ignition module assemblies, one for each bank of cylinders. Each assembly contains an ignition control (IC) module and 4 ignition coils. Both IC modules consist of the following circuits:
- Ignition 1 voltage circuit
- Ground circuit
- IC circuits for cylinders 1, 3, 5, 7 on bank 1 ignition module
- IC circuits for cylinders 2, 4, 6, 8 on bank 2 ignition module
- IC module low reference circuit
Each ignition coil connects directly to its spark plug through a wire spring conductor housed in a short spark plug boot. The IC circuits transmit timing pulses from the Powertrain Control Module (PCM) to the IC modules which triggers the ignition coils in the proper sequence for spark plug firing. The PCM monitors each IC circuit for improper voltage levels. If an improper voltage level is detected on an IC circuit, a DTC will set.
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.