1996 Acura 2.5TLFACTORY OEM SERVICE PROCEDURE

PCM Input Signals

WARNING: This page is about a different car, the 1995 Acura 2.5TL. However, it is still accessible from the selected car via links, so may be relevant.
  1. Timing control and triggering of fuel injectors are based on input signals from TDC/CRANK/CYL sensors. These sensors are Permanent Magnet (PM) generator pick-up coils.
  2. Using a DVOM (preferably with bar-graph function) on low-volt scale, test each sensor for pulse voltage signal at indicated PCM harness terminals while engine is cranking. See PCM INPUT SIGNAL & RESISTANCE TEST TERMINALS . If pulse signal is present, sensor is okay. If pulse signal is not present, go to next step.
  3. Turn ignition off. Unplug PCM connector. Inspect wiring harness and connectors. Measure resistance of each sensor at indicated PCM harness terminals. See PCM INPUT SIGNAL & RESISTANCE TEST TERMINALS . If resistance is within specification, go to next step. If resistance is not within specification, go to step 5).
    PCM INPUT SIGNAL & RESISTANCE TEST TERMINALS

    Application PCM Terminals (1) Ohms
    CRANK B15 & B16 650-850 Ohms
    CYL B11 & B12 650-850 Ohms
    TDC B13 & B14 650-850 Ohms
    (1) See Fig 1.
    Fig 1: PCM Connector Terminal Identification
    G92B26196Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Test each terminal for continuity to ground. If continuity exists, unplug sensor connector, and again test appropriate PCM terminal for continuity to ground. If continuity still exists, repair short to ground in harness. If continuity does not exist, replace sensor.
  5. Unplug sensor connector. Measure resistance of sensor. See Fig 2. If resistance is within specification, repair open, short, or poor connection in sensor harness between PCM and sensor. See PCM INPUT SIGNAL & RESISTANCE TEST TERMINALS . If sensor resistance is not within specification, replace sensor assembly.
    Fig 2: Identifying Sensor Connector Terminals
    G95H31176Courtesy of AMERICAN HONDA MOTOR CO., INC.
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When to See a Mechanic

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.