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Ignition Control Module (ICM) Input Test (Accord 2.3L)

  1. Turn ignition off. Remove distributor cap, rotor and leak cover. Disconnect wires from ICM. See Figure or Figure . Turn ignition on. Check for voltage between body ground and ICM Black/Yellow wire. If battery voltage exists, go to next step. If battery voltage does not exist, check for open in Black/Yellow wire between ignition switch and ICM. See WIRING DIAGRAMS article.
  2. Ensure ignition is on. Check for voltage between body ground and ICM White/Black wire (White/Blue wire on F23A5 engine). See Figure or Figure . If battery voltage exists, go to next step. If battery voltage does not exist, check ignition coil operation. See IGNITION COIL TEST (ACCORD 2.3L & CR-V) . Replace ignition coil as necessary. If ignition coil is okay, check for open in White/Black wire (White/Blue wire on F23A5 engine) between ICM and ignition coil.
  3. Turn ignition off. Disconnect PCM connector "B" (25-pin connector). Check continuity of Yellow/Green wire between PCM connector "B" (25-pin connector) terminal No. 13 and ICM. If continuity exists, go to next step. If continuity does not exist, repair open in Yellow/Green wire.
  4. Check continuity between body ground and Yellow/Green wire. If continuity exists, check for short to ground in Yellow/Green wire. If continuity does not exist, wiring is okay at this time. Turn ignition off, and reconnect PCM connector "B" (25-pin connector). Replace ICM.
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