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.
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