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Ignition Control Module (ICM) Input Test

  1. Ensure tachometer operates properly. Turn ignition off. Remove distributor cap, rotor and leak cover. Disconnect wires from ICM. See Fig 1 . 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 ignition switch and ICM. Repair wire as necessary.
  2. Turn ignition on. Check for voltage between ground and White/Blue wire. If battery voltage exists, go to next step. If battery voltage does not exist, check ignition coil. Replace coil as necessary. If ignition coil is okay, check White/Blue wire between ignition coil and ICM.
  3. Disconnect PCM 32-pin connector "A". Check for continuity in Yellow/Green wire between PCM 32-pin connector "A" terminal A20 and ICM. If continuity exists, go to next step. If continuity does not exist, repair open in Yellow/Green wire.
  4. Check for continuity in Yellow/Green wire between ground and PCM 32-pin connector "A" terminal A20. If continuity exists, go to next step. If continuity does not exist, repair short to ground in Yellow/Green wire.
  5. Check for continuity between ground and Blue(1) wire. If continuity exists, repair short to ground in Blue(1) wire. If continuity exists, wiring is okay. Reconnect PCM 32-pin connector "A" and replace ICM.
    Fig 1: Exploded View Of Distributor
    G97A07247Courtesy of AMERICAN HONDA MOTOR CO., INC.
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