P0812
DTC P0812: Open in Transmission Range Switch ATP RVS Switch CircuitNOTE:
^ Before you troubleshoot, record all freeze data and any on-board snapshot, and review General Troubleshooting Information.
^ This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.
1. Turn the ignition switch ON (II).
2. Shift to the R position, and verify the A/T R SWITCH in the DATA LIST with the HDS.
Is the A/T R SWITCH ON?
YES - Go to step 3.
NO - Inspect the end of the selector control shaft, adjust the shift cable, then recheck. If the problem still exists, go to step 4.
3. Check the REVERSE SWITCH in the DATA LIST with the HDS.
Is the REVERSE SWITCH ON?
YES - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals between the transmission range switch and the PCM.
NO - Go to step 4.
4. Turn the ignition switch OFF.
5. Check for continuity between PCM connector terminal A8 and body ground, and between PCM connector terminal A9 and body ground.
Is there continuity?
YES - Go to step 6.
NO - Repair open in the wires between PCM connector terminals A8, A9, and ground (G101), and repair poor ground (G101), then go to step 12.
6. Turn the ignition switch ON (II).
7. Shift to the R position.
8. Measure the voltage between PCM connector terminals C12 and A9.
Is there voltage?
YES - Go to step 9.
NO - Check for poor connections or loose terminals between PCM connector terminal C12 and the transmission range switch. If the connection is OK, go to step 19.
9. Turn the ignition switch OFF.
10. Disconnect the transmission range switch connector.
11. Check for continuity between the No. 1 and No. 10 terminals at the transmission range switch. The shift position must be R.
Is there continuity?
YES - Check for poor connections or loose terminals between transmission range switch connector terminal No. 1 and PCM connector terminal C12. If the connection is OK, repair open in the wire between PCM connector terminal C12 and the transmission range switch, then go to step 12.
NO - Replace the transmission range switch, then go to step 12.
12. Reconnect all connectors.
13. Turn the ignition switch ON (II).
14. Clear the DTC with the HDS.
15. Start the engine.
16. With the brake pedal pressed, shift slowly to the P, R, then N position.
17. Check for DTCs with the HDS.
Is DTC P0812 indicated?
YES - Check for poor connections or loose terminals between the transmission range switch and the PCM, then go to step 1.
NO - Go to step 18.
18. Monitor the OBD STATUS for P0812 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - Troubleshooting is complete. If any other DTCs were indicated in step 17, go to the indicated DTC's troubleshooting.
NO - If the screen indicates FAILED, check for poor connections or loose terminals between the transmission range switch and the PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step 15.
19. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
20. Start the engine.
21. With the brake pedal pressed, shift slowly to the P, R, then N position.
22. Check for DTCs with the HDS.
Is DTC P0812 indicated?
YES - Check for poor connections or loose terminals between the transmission range switch and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 20. If the PCM was substituted, go to step 1.
NO - Go to step 23.
23. Monitor the OBD STATUS for P0812 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other DTCs were indicated in step 22, go to the indicated DTC's troubleshooting.
NO - If the screen indicates FAILED, check for poor connections or loose terminals between the transmission range switch and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 20. If the PCM was substituted, go to step 1. If the screen indicates NOT COMPLETED, go to step 20.