1992 Acura Legend Base, AutomaticFACTORY OEM SERVICE PROCEDURE

ECU Input Signals

  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, check each sensor for pulse voltage signal at indicated ECU harness terminals with engine cranking. See ECU INPUT SIGNAL & RESISTANCE TEST TERMINALS  table. See Fig 1 for ECU terminal identification. If pulse signal is present, sensor is okay. If pulse signal is not present, go to step 3).
  3. Turn ignition off. Disconnect ECU connector. Check wiring harness and connectors. Check resistance of each sensor at indicated ECU harness terminals. See ECU INPUT SIGNAL & RESISTANCE TEST TERMINALS  table. If resistance is within specification, go to step 4). If resistance is not within specification, go to step 5).
    ECU INPUT SIGNAL & RESISTANCE TEST TERMINALS

    Application ECU Terminals Ohms
    Integra
    CRANK B15 & B16 350-700 Ohms
    CYL B11 & B12 350-700 Ohms
    TDC B13 & B14 350-700 Ohms
    Legend
    CRANK No. 1 B15 & B16 650-900 Ohms
    CRANK No. 2 B14 & B13 650-900 Ohms
    CYL No. 1 B12 & B11 650-900 Ohms
    CYL No. 2 B9 & B10 650-900 Ohms
    Vigor
    CRANK B15 & B16 650-850 Ohms
    CYL B11 & B12 650-850 Ohms
    TDC B13 & B14 650-850 Ohms
    Fig 1: ECU Connector Terminal ID
    G92B26196Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Check continuity to ground on each terminal. If continuity exists, disconnect sensor connector, and recheck appropriate ECU terminal for continuity to ground. If continuity still exists, repair short to ground in harness. If continuity does not exist, replace sensor assembly.
  5. Disconnect sensor connector. Check resistance of sensor. See Fig 2 , Fig 3 or Fig 4 . If resistance is within specification, repair open, short or corrosion in sensor harness between ECU and sensor. If sensor resistance is not within specification, replace sensor assembly. See ECU INPUT SIGNAL & RESISTANCE TEST TERMINALS  table.
    Fig 2: Sensor Connector Terminal ID (Integra)
    G92C26197Courtesy 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.

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