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 Control Module Input Test
1997 Acura 2.2CL StandardSECTION Ignition Control Module Input Test
- Turn ignition off. Remove distributor cap and rotor. Disconnect Yellow/Green, Black/Yellow, White/Black, and Blue wires from Ignition Control Module (ICM). See Figure . Turn ignition on. Check for battery voltage between ICM Black/Yellow wire and ground. If battery voltage exists, go to next step. If battery voltage does not exist, check for an open in Black/Yellow wire between ignition switch and ignitor wiring harness connector.
- Turn ignition on. Check for battery voltage between ICM White/Black wire and ground. If battery voltage exists, go to next step. If battery voltage does not exist, check for an open in White/Black wire between ICM and ignition coil, and check coil. If White/Black wire is okay, substitute a known-good ignition coil.
- Turn ignition switch off. Disconnect PCM 32-pin harness connector. Check for continuity in Yellow/Green wire between PCM harness connector and ICM. If continuity exists, go to next step. If continuity does not exist, repair open in Yellow/Green wire.
- Check for continuity between Yellow/Green wire and ground. If continuity does not exist, go to next step. If continuity exists, repair short to ground in Yellow/Green wire.
- Connect PCM 32-pin harness connector. Disconnect instrument cluster 22-pin harness connector. Check for continuity in Blue wire between ICM and tachometer. If continuity exists, go to next step. If continuity does not exist, repair open in Blue wire.
- Check for continuity between Blue wire and ground. If continuity exists, repair short to ground. If continuity does not exist, wiring is okay. Replace ICM.
RENDER: 1.0x
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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.