DTC Troubleshooting

DTC Troubleshooting: P0812 (65)

DTC P0812: Open in Transmission Range Switch ATPR Switch Circuit

NOTE:

- Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, and review General Troubleshooting Information. How To Troubleshoot A/T Systems (A/T)

- 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 to ON (II).

2. Shift to R, and check the A/T R Switch in the Data List with the HDS.

Is the A/T R Switch ON?
YES - Intermittent failure, the system is OK at this time.

NO - Go to step 3.


3. Turn the ignition switch to LOCK (0).

4. Disconnect the transmission range switch connector.

5. Check for continuity between transmission range switch connector terminal No. 10 and body ground.

Is there continuity?
YES - Go to step 6.

NO - Repair open in the wire between transmission range switch connector terminal No 10 and body ground (G101),. or repair poor body ground (G101), then go to step 9.






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

7. Measure the voltage between transmission range switch connector terminals No. 7 and No. 10.

Is there about battery voltage?
YES - Go to step 8.

NO - Repair open in the wire between PCM connector terminal B14 and the transmission range switch, then go to step 9.






8. Check for continuity between transmission range switch connector terminals No. 7 and No. 10 when the shift lever is in R, and when the shift lever is shifted to any position other than R.

Is there continuity when the shift lever is in R, and no continuity when the shift lever is shifted to any position other than R?
YES - Go to step 15.

NO - Replace the transmission range switch, Service and Repair then go to step 9.






9. Reconnect all connectors.

10. Turn the ignition switch to ON (II).

11. Clear the DTC with to the HDS.

12. Test-drive the vehicle with the shift lever in R at speeds below 3 mph (5 km/h) for at least 2 seconds. Then increase the speed and drive over 3 mph (5 km/h) for at least 2 seconds.

13. Check for Temporary DTCs or 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 14.


14. Monitor the OBD STATUS for P0812 in the DTCs MENU with the HDS.

Does the HDS indicate PASSED?
YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 13, go to the indicated DTC's troubleshooting.

NO - If the HDS indicates FAILED, check for poor connections or loose terminals between the transmission range switch and the PCM, then go to step 1. If the HDS indicates NOT COMPLETED, go to step 12.


15. Reconnect all connectors.

16. Update the PCM if it does not have the latest software, ECM/PCM Update (A/T) or substitute a known-good PCM. Initial Inspection and Diagnostic Overview

17. Test-drive the vehicle with the shift lever in R at speeds below 3 mph (5 km/h) for at least 2 seconds. Then increase the speed and drive over 3 mph (5 km/h) for at least 2 seconds.

18. Check for Temporary DTCs or 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, Initial Inspection and Diagnostic Overview then go to step 17. If the PCM was substituted, go to step 1.

NO - Go to step 19.


19. Monitor the OBD STATUS for P0812 in the DTCs MENU with the HDS.

Does the HDS indicate PASSED?
YES - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. Service and Repair If any other Temporary DTCs or DTCs were indicated in step 18, go to the indicated DTC's troubleshooting.

NO - If the HDS 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, Initial Inspection and Diagnostic Overview then go to step 17. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, go to step 17.