## Interlock System - Shift Lock System Circuit Troubleshooting

1. | Press the brake pedal. Are the brake lights ON? YES - Go to 2. NO - Repair faulty brake pedal circuit.n

2. | Disconnect the battery negative terminal.

3. | Disconnect PCM connectors A (31P) and E (31P).

4. | Connect the battery negative terminal.

5. | Press the brake pedal, and measure the voltage between PCM connector terminals E22 and A23 or A24. Is there battery voltage? YES - Release the brake pedal, then go to 6. NO - Repair open in the wire between PCM connector terminal E22 and the brake pedal position switch.n

6. | Turn the ignition switch ON (II).

7. | Press the brake pedal, and measure the voltage between PCM connector terminals E13 and A23 or A24. Is there battery voltage? YES - Release the brake pedal, then go to 8. NO - Update the PCM if it does not have the latest software, or subsutitute a known-good PCM, then recheck. If the symptom/ indication goes away with a known-good PCM, replace the original PCM.n

8. | Turn the ignition switch OFF.

9. | Disconnect the battery negative terminal.

10. | Connect PCM connectors A (31P) and E (31P).

11. | Connect the battery negative terminal.

12. | Disconnect the gauge assembly connector B (14P).

13. | Turn the ignition switch ON (II).

14. | Press the brake pedal, and measure the voltage between gauge assembly connector terminal B6 and body ground. Is there battery voltage? YES - Release the brake pedal, then go to 15. NO - Repair open or short in the wire between PCM connector terminal E13 and the gauge assembly connector terminal B6.n

15. | Turn the ignition switch OFF.

16. | Disconnect the shift lock solenoid/park pin switch connector.

17. | Turn the ignition switch ON (II).

18. | Measure the voltage between shift lock solenoid/park pin switch connector terminal No. 1 and body ground. Do not press the accelerator pedal. Is there battery voltage? YES - Go to 19. NO - Check for blown No. 16 fuse in under-hood fuse/relay box. If the fuse is OK, repair open or short in the wire between the shift lock solenoid connector and the under-hood fuse/relay box.n

19. | Press the brake pedal, and measure the voltage between shift lock solenoid connector terminals No. 1 and No. 3. The shift lever must be in [P] position. Is there battery voltage? YES - Go to 20. NO - Go to 21.

20. | Connect the battery positive terminal to shift lock solenoid/park pin switch connector terminal No. 1, and connect the battery negative terminal to the terminal No. 3, then check that the shift lock solenoid operates. NOTE: Do not connect the battery positive terminal to the terminal No. 3 or you will damage the diode inside the shift lock solenoid. Does the shift lock solenoid operate properly? YES - Repair the shift lock mechanism.n NO - Replace the shift lock solenoid.n

21. | Turn the ignition switch OFF.

22. | Disconnect gauge assembly connector B (14P).

23. | Check for continuity between gauge assembly connector terminal B1 and shift lock solenoid/park pin switch connector terminal No. 3. Is there continuity? YES - Go to 24. NO - Repair open in the wire between gauge assembly connector terminal B1 and the shift lock solenoid/park pin switch connector.n

24. | Check for continuity between gauge assembly connector terminal B14 and body ground while the shift lever is in [P] position, and when the shift lever in any position other than [P] and [N]. Is there continuity while the shift lever is in [P] position, and no continuity when the shift lever in any position other than [P] and [N]? YES - Faulty shift lock system circuit in the gauge assembly, replace the gauge assembly.n NO - Repair open in the ATP P wire between gauge assembly connector terminal B14 and the transmission range switch.n