Ignition Control Module Input Test
WARNING: This page is about a different car, the 1999 Acura Integra, 1999 Acura 3.5RL, 1999 Acura 3.2TL, 1999 Acura 3.0CL, and 1999 Acura 2.3CL. However, it is still accessible from the selected car via links, so may be relevant.
- 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 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.