Shift Interlock: Testing and Inspection
A/T Interlock System - Shift Lock System Circuit Troubleshooting
NOTE: Check for A/T DTCs. If any DTCs are present, troubleshoot those first.
1. Connect the HDS to the DLC (A) located under the driver's side of the dashboard.
2. Turn the ignition switch to ON (II). Make sure the HDS communicates with the PCM. If it does not, go to the DLC circuit troubleshooting Testing and Inspection.
3. Select Shift Lock Solenoid Test in the Miscellaneous Test Menu, and check that the shift lock solenoid operates with the HDS.
Does the shift lock solenoid work properly?
YES -
Go to step 16.
NO -
Go to step 4.
4. Turn the ignition switch to LOCK (0).
5. Remove the driver's center console trim.
6. Disconnect the shift lock solenoid connector.
7. Turn the ignition switch to ON (II).
8. Measure voltage between shift lock solenoid connector terminal No. 1 and body ground.
Is there battery voltage?
YES -
Go to step 9.
NO -
Check for a blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box. If the fuse is OK, repair open or short in the wire between shift lock solenoid connector terminal No. 1 and the under-dash fuse/relay box.�
9. With the shift lever in P, press the brake pedal. Do not press the accelerator.
10. Measure voltage between shift lock solenoid connector terminals No. 1 and No. 2 while pressing the brake pedal.
Is there battery voltage?
YES -
Go to step 11.
NO -
Go to step 12.
11. Release the brake pedal, and measure the voltage between shift lock solenoid connector terminals No. 1 and No. 2. The shift lever must be in P.
Is there battery voltage?
YES -
Repair a short to body ground in the wire between PCM connector terminal A2 and the shift lock solenoid connector.�
NO -
Check the shift lock mechanism. If the mechanism is OK, replace the shift lock solenoid Service and Repair.�
12. Turn the ignition switch to LOCK (0).
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector A (49P).
15. Check for continuity between PCM connector terminal A2 and shift lock solenoid connector terminal No. 2.
Is there continuity?
YES -
Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM, and recheck. If the symptom goes away with a known-good PCM, replace the original PCM Service and Repair.�
NO -
Repair an open in the wire between PCM connector terminal A2 and the shift lock solenoid connector.�
16. Monitor the Brake Switch in the Data List with the HDS, and press the brake pedal.
Is the Brake Switch ON?
YES -
Go to step 21.
NO -
If the brake lights come on, go to step 17. If the brake lights do not work, repair faulty brake light circuit.�
17. Turn the ignition switch to LOCK (0).
18. Jump the SCS line with the HDS.
19. Disconnect PCM connector A (49P).
20. Measure the voltage between PCM connector terminal A8 and body ground while pressing the brake pedal and when the brake pedal is released.
Is there battery voltage while pressing the brake pedal and about 0 V when the pedal is released?
YES -
Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM, and recheck. If the symptom goes away with a known-good PCM, replace the original PCM Service and Repair.�
NO -
Repair an open in the wire between PCM connector terminal A8 and the brake pedal position switch.�
21. Monitor the A/T P Switch in the Data List with the HDS with the shift lever in P.
Is the A/T P Switch ON?
YES -
Go to step 31.
NO -
Go to step 22.
22. Turn the ignition switch to LOCK (0).
23. Disconnect the transmission range switch connector.
24. Turn the ignition switch to ON (II).
25. Connect a jumper wire between transmission range switch connector terminal No. 7 and body ground.
26. Check the ATPP Switch signal with the HDS.
Is the ATPP Switch ON?
YES -
Replace the transmission range switch.�
NO -
Go to step 27.
27. Turn the ignition switch to LOCK (0).
28. Jump the SCS line with the HDS.
29. Disconnect PCM connector A (49P).
30. Check for continuity between PCM connector terminal A16 and the transmission range switch connector terminal No. 7.
Is there continuity?
YES -
Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM, and recheck. If the symptom goes away with a known-good PCM, replace the original PCM Service and Repair.�
NO -
Repair an open in the wire between PCM connector terminal A16 and the transmission range switch connector.�
31. Check the APP Sensor A with the HDS in the A/T Data List. Do not press the accelerator.
Is the APP Sensor A opening 5 % or more, or the sensor A voltage 1.16 V or higher?
YES -
Check the APP Sensor Testing and Inspection.�
NO -
Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM, and recheck. If the symptom goes away with a known-good PCM, replace the original PCM Service and Repair.�