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Shift Lock System Circuit Troubleshooting

  1. Press the brake pedal.

    Are the brake lights ON? 

    YES  - Go to step 2.

    NO  - Repair faulty brake light circuit.

  2. Turn the ignition switch ON (II), and shift to the P position.
  3. Press the brake pedal, and release the accelerator pedal.
  4. Measure the voltage between PCM connector terminal A28 and body ground.

    Is there battery voltage? 

    YES  - Check for an open in the wire between PCM connector terminal A28 and the multiplex control unit (driver's). If the wire is OK, check for loose terminal fit in the multiplex control unit (driver's) connectors. If necessary, substitute a known-good multiplex control unit (driver's) and recheck.

    NO  - Go to step 5.

    Fig 1: Measuring Voltage Between PCM Connector Terminal A28 & Body Ground
    G01502400Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. Turn the ignition switch OFF, and disconnect the battery negative terminal.
  6. Disconnect PCM connectors A (32P) and B (25P).
  7. Press the brake pedal, and measure the voltage between PCM connector terminals A32 and B20 or B22.

    Is there battery voltage? 

    YES  - Release the brake pedal, and go to step 8.

    NO  - Repair open in the wire between PCM connector terminal A32 and the brake pedal position switch.

    Fig 2: Measuring Voltage Between PCM Connector Terminals A32 & B20 Or B22
    G01502401Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Connect PCM connectors A (32P) and B (25P).
  9. Turn the ignition switch ON (II).
  10. Measure the voltage between PCM connector terminals A27 and B20 or B22.

    Is there about 0.5 V (throttle fully closed)? 

    YES  - Go to step  18 .

    NO  - Go to step 11.

    Fig 3: Measuring Voltage Between PCM Connector Terminals A27 & B20 Or B22
    G01502402Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Turn the ignition switch OFF.
  12. Disconnect the throttle position sensor (TPS) connector.
  13. Turn the ignition switch ON (II).
  14. Measure the voltage between TPS connector terminals No. 1 and No. 3.

    Is there about 5V? 

    YES  - Check for a short or an open in the wire between PCM connector terminal A27 and the TPS. If the wire is OK, replace the TPS.

    NO  - Go to step 15.

    Fig 4: Measuring Voltage Between TPS Connector Terminals No. 1 & No. 3
    G01502403Courtesy of AMERICAN HONDA MOTOR CO., INC.
  15. Turn the ignition switch OFF.
  16. Disconnect PCM connector C (31P).
  17. Check for continuity between TPS connector terminal No. 1 and body ground, and between terminal No. 3 and body ground.

    Are there continuity? 

    YES  - Check for a short to ground in the wires between TPS connector terminals No. 1 and No. 3, and the PCM. If the wires are OK, replace the PCM.

    NO  - Go to step 18.

    Fig 5: Checking Continuity Between TPS Connector Terminal No. 1 & Body Ground, And Between Terminal No. 3 & Body Ground
    G01502404Courtesy of AMERICAN HONDA MOTOR CO., INC.
  18. Disconnect the shift lock solenoid connector.
  19. Check for continuity between shift lock solenoid connector terminal No. 2 and multiplex control unit (driver's) connector terminal B22.

    Is there continuity? 

    YES  - Go to step 20.

    NO  - Repair open in the wire between multiplex control unit (driver's) connector terminal B22 and the shift lock solenoid.

    Fig 6: Checking Continuity Between Shift Lock Solenoid Connector Terminal No. 2 & Multiplex Control Unit (Driver's) Connector Terminal B22
    G01502405Courtesy of AMERICAN HONDA MOTOR CO., INC.
  20. Turn the ignition switch ON (II).
  21. Measure the voltage between shift lock solenoid connector terminal No 1 and body ground.

    Is there battery voltage? 

    YES  - Go to step 22.

    NO  - Check for blown No. 9 (10A) fuse in the driver's under-dash fuse/relay box. If the fuse is OK, repair open or short in the wire between the No. 1 terminal of the shift lock solenoid connector and the driver's under-dash fuse/relay box.

    Fig 7: Measuring Voltage Between Shift Lock Solenoid Connector Terminal No 1 & Body Ground
    G01502406Courtesy of AMERICAN HONDA MOTOR CO., INC.
  22. Connect the battery positive terminal to shift lock solenoid connector terminal No. 1, and connect the battery negative terminal to the terminal No. 2.
    NOTE: Do not connect the terminal No. 2 to the battery positive terminal or you will damage the diode inside the shift lock solenoid.
    Fig 8: Identifying Shift Lock Solenoid Connector Terminals
    G01502407Courtesy of AMERICAN HONDA MOTOR CO., INC.
  23. Check that the shift lock solenoid operates

    Does the shift lock solenoid operate properly? 

    YES  - Check for a loose multiplex control unit (driver's) connector. If necessary, substitute a known-good multiplex control unit (driver's) and recheck.

    NO  - Replace the shift lock solenoid.

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