P0812
DTC P0812: Open in Transmission Range Switch ATP RVS Switch Circuit2005-2006 Models
NOTE: Record all freeze data and review General Troubleshooting Information before you troubleshoot. 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 signal with the HDS in the A/T data list.
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 problem still exists, go to step 4.
3. Check the REVERSE SWITCH signal 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 at the transmission range switch and PCM.
NO - Go to step 4.
4. Turn the ignition switch OFF.
5. Check for continuity between PCM connector terminals A8 and body ground, and between 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 loose or poor connections at PCM connector terminal C12. If the connection is OK, update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM.
9. Turn the ignition switch OFF.
10. Disconnect the transmission range switch connector.
11. Check for continuity between transmission range switch connector terminals No. 1 and No. 10. The shift position must be the R position.
Is there continuity?
YES - Check for loose or poor connections at the transmission range switch connector terminal No. 1. 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. Clear the DTC with the HDS.
13. Start the engine, and shift the shift lever slowly into the P, R, then N position.
14. Monitor the OBD status for P0812 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.
Does the result indicate a passed?
YES - Troubleshooting is completed.
NO - Return to step 1 and recheck.