Ignition Control Module (ICM) Input Test (Civic 1.6L)
- Turn ignition off. Remove distributor cap, rotor and leak cover (TEC). Disconnect wires from ICM. See Figure or Figure . Turn ignition on. Check for voltage between ground and Black/Yellow wire. If battery voltage exists, go to next step. If battery voltage does not exist, check Black/Yellow wire between underdash fuse/relay box and ICM. Repair wire as necessary.
- Turn ignition on. Check for voltage between ground and Blue (2) wire (Hitachi) or White/Blue wire (TEC). See Figure or Figure . If battery voltage exists, go to next step. If battery voltage does not exist, check ignition coil. See IGNITION COIL RESISTANCE TEST . If ignition coil is okay, check Blue (2) wire (Hitachi) or White/Blue wire (TEC) between ignition coil and ICM. Repair as necessary.
- Turn ignition switch off. Disconnect PCM 32-pin "A" connector. Check for continuity in Yellow/Green wire between PCM 32-pin connector terminal A20 and ICM. See WIRING DIAGRAMS . If continuity exists, go to next step. If continuity does not exist, repair open in Yellow/Green wire.
- Check for continuity between ground and Yellow/Green wire. If continuity does not exist, go to next step. If continuity exists, repair short to ground in Yellow/Green wire.
- Reconnect PCM 32-pin connector "A" to PCM. Check for continuity in Blue (1) wire between ICM and tachometer test connector. If continuity exists, go to next step. If continuity does not exist, repair open in Blue (1) wire.
- Check for continuity between ground and Blue (1) wire. If continuity exists, repair short to ground in Blue (1) wire. If continuity does not exist, wiring is okay. Replace ICM.