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Ignition Control Module Input Test

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1998 Acura Integra, 1998 Acura 3.5RL, 1998 Acura 3.2TL, 1998 Acura 3.0CL, and 1998 Acura 2.5TL. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Disconnect ignition control module (ICM) 4-pin connector mounted on ignition coil. Check for continuity between terminal No. 4 (Black wire) and ground. See Fig 1. If continuity exists, go to next step. If continuity does not exist, check for an open Black wire, disconnected terminals or a poor G101 ground located near Idle Air Control (IAC) valve.
    Fig 1: Testing Ignition Control Module Input Circuit (2.5TL)
    G95F31174Courtesy of AMERICAN HONDA MOTOR CO., INC.
  2. Turn ignition on. Check voltage between ICM 4-pin connector terminals No. 3 (Black/Yellow wire) and No. 4 (Black wire). If battery voltage exists, go to next step. If battery voltage does not exist, check for an open in Black/Yellow wire between ignition coil and ICM, disconnected terminals or faulty ignition coil.
  3. With ignition on, check for battery voltage between ICM 4-pin connector terminals No. 2 (Green wire) and No. 4 (Black wire). If battery voltage does not exist, check for an open in Green wire between ignition coil and ICM. Repair as necessary. If Green wire is okay, substitute a known-good ignition coil and recheck.
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