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Ignition Control Module (ICM) Input Test

NOTE:
  • If the Malfunction Indicator Lamp (MIL) comes on, refer to the Fuel and Emission System (see GENERAL TROUBLESHOOTING INFORMATION ).
  • Perform an input test for the Ignition Control Module (ICM) after finishing the fundamental tests for the ignition system and the fuel and emissions systems.
  • The tachometer should operate normally if the ICM is OK.
  1. Remove the distributor cap, the distributor rotor, and the leak cover.
  2. Disconnect the wires from the ICM (A).

    Fig 1: Disconnecting Wires From ICM (F23A1 & F23A4 Engines)
    G02556774Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Fig 2: Disconnecting Wires From ICM (F23A5 Engine)
    G02556775Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Turn the ignition switch ON (II). Check for voltage between the BLK/YEL wire and body ground. There should be battery voltage.
    • If there is no battery voltage, check the BLK/YEL wire between the ignition switch and the ICM.
    • If there is battery voltage, go to step 4.
  4. Turn the ignition switch ON (II). Check for voltage between the WHT/BLK (WHT/BLU for the F23A5 engine) wire and body ground. There should be battery voltage.
    • If there is no battery voltage, check:
      • ignition coil.
      • WHT/BLK (WHT/BLU for the F23A5 engine) wire between the ICM and ignition coil.
    • If there is battery voltage, go to step 5.
  5. Disconnect the Engine Control Module (ECM)/ Powertrain Control Module (PCM) connector B (25 P), and check for continuity on the YEL/GRN wire between the ICM and ECM/PCM connector terminal B13. There should be continuity.
  6. Check for continuity on the YEL/GRN wire to body ground. There should be no continuity.
  7. If all the tests are normal, replace the ICM and reconnect the ECM/PCM connector B (25P).
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