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Shift Interlock System

NOTE: For shift interlock system circuit wire color and terminal identification, see WIRING DIAGRAMS .
  1. Press the brake pedal. Are the brake lights on? If yes, go to next step. If no, repair faulty brake light circuit. See appropriate EXTERIOR LIGHTS article in ACCESSORIES & EQUIPMENT.
  2. Turn the ignition on, and shift to the "P" position.
  3. Turn the ignition off.
  4. Disconnect PCM connectors "A" (32 pin) and "B" (25 pin). PCM is located below instrument panel under front lower panel in center console area. See Figure.
  5. Press the brake pedal, and measure the voltage between PCM connector terminals A32 and B20 or B22. See Figure. Is there battery voltage? If yes, release the brake pedal and go to next step. If no, repair open in the wire between PCM connector terminal A32 and the brake pedal position switch. See WIRING DIAGRAMS . For brake pedal position switch harness connector terminal identification, see Fig 1.
  6. Reconnect PCM connectors "A" (32 pin) and "B" (25 pin).
  7. Turn the ignition on.
  8. Measure the voltage between PCM connector terminals C27 and B20 or B22. Is there about 0.5 volts (throttle fully closed)? If yes, go to step  13. If no, go to next step.
  9. Turn the ignition off.
  10. Disconnect the Throttle Position (TP) sensor harness connector. See Fig 2.
  11. Measure the voltage between the No. 1 and 3 terminals of the TP sensor harness connector. See Fig 3. Is there about 5 volts? If yes, check for a short or open in the wire between PCM connector terminal C27 and the TP sensor. If the wire is okay, replace the throttle body. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. If no, go to next step.
  12. Turn the ignition off, and disconnect PCM connector "C" (31 pin). Check for continuity between the No. 3 terminal and ground. Is there continuity? If yes, check for a short to ground between the No. 3 terminal of the TP sensor connector and ground. If the wire is okay, replace the PCM. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION. If no, go to next step.
  13. Disconnect the shift lock solenoid connector. To access shift lock solenoid, see SHIFT LOCK SOLENOID  under REMOVAL & INSTALLATION.
  14. Turn the ignition on.
  15. Measure the voltage between the No. 1 (Yellow/Red wire) terminal of the shift lock solenoid connector and body ground. See Fig 4. Is there battery voltage? If yes, go to next step. If no, check for blown No. 8 (7.5 amp) fuse in the driver's under-dash fuse/relay box. If the fuse is okay, repair open or short in the wire between the No. 1 terminal of the shift lock solenoid and the driver's under-dash fuse/relay box. See WIRING DIAGRAMS .
    16. NOTE: Do not connect the No. 2 (Green/Yellow wire) terminal to the battery positive terminal or you will damage the diode inside the shift lock solenoid.
  16. Connect the No. 1 terminal of the shift lock solenoid connector to the battery positive terminal, and connect the No. 2 terminal to the battery negative terminal.
  17. Check that the shift lock solenoid operates. Does the shift lock solenoid operate properly? If yes, check for an open in the wire between PCM connector terminal A28 and the shift lock solenoid. If no, replace the shift lock solenoid. See SHIFT LOCK SOLENOID  under REMOVAL & INSTALLATION.
Fig 1: Identifying Brake Light Switch Component Connector Terminals
G00015440Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig 2: Locating Engine Performance Related Components
G00032253Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig 3: Identifying TP Sensor Harness Connector Terminals
G00153634Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig 4: Identifying Shift Lock Solenoid Location
G00153637Courtesy of AMERICAN HONDA MOTOR CO., INC.
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