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 Discharge Module (IDM)
Connect TECH 2 scan tool to Data Link Connector (DLC). Remove ignition discharge module. Inspect IDM seals, springs and electrical connector for wear or damage. See Fig 1. Repair or replace as necessary. Reconnect electrical connector. Install test spark plugs into IDM and connect SST 86 10 867 spark plug grounding lead (or equivalent). See Fig 2. Turn ignition on. Keep IDM in upright position and use scan tool to select ACTIVATE: IGNITION COIL CYL 1-6. Test several cylinders to compare to each other. If any ignition coil does not spark, replace IDM.
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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.