2000 Honda Prelude Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Ignition Control Module (ICM) Input Test (Prelude)

  1. Turn ignition off. Remove distributor cap, rotor and leak cover. Disconnect wires from ICM. See Fig 6. 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 for open in Black/Yellow wire between ignition switch and ICM. See WIRING DIAGRAMS article.
  2. Ensure ignition is on. Check for voltage between ground and Green wire. See Fig 6. If battery voltage exists, go to next step. If battery voltage does not exist, check ignition coil operation. See EXTERNAL IGNITION COIL RESISTANCE TEST (PRELUDE) . Replace ignition coil as necessary. If ignition coil is okay, check for open in Green wire between ICM and ignition coil.
  3. Turn ignition switch off. Disconnect PCM 32-pin connector "A". Check for continuity in Yellow/Green wire between PCM 32-pin harness connector "A" terminal No. 20 and ICM. If continuity exists, go to next step. If continuity does not exist, repair open in Yellow/Green wire.
  4. Check for continuity between ground and Yellow/Green wire. If continuity does not exist, go to next step. If continuity exists, check for short to ground in Yellow/Green wire.
  5. Reconnect PCM 32-pin connector "A". Disconnect instrument cluster 16-pin 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.
  6. Check for continuity between ground and Blue wire. If continuity exists, check for short to ground in Blue wire. If continuity does not exist, wiring is okay at this time. Replace ICM.
Fig 1: Exploded View Of Distributor (Accord 2.3L F23A1 & F23A4 Engines)
G98A07134Courtesy of AMERICAN HONDA MOTOR CO., INC.
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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.

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