P0815
DTC P0815: Short in Transmission Gear Selection Switch Upshift Switch Circuit, or Transmission Gear Selection Switch Upshift Switch Stuck ONNOTE:
^ 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 P position.
3. Verify the transmission gear selection switch upshift switch signal input with the HDS in the A/T data list.
Is UPSHIFT SW ON?
YES - Go to step 4.
NO - intermittent failure, the system is OK at this time. Check the S-UP (BLU) wire for an intermittent short to ground between the transmission gear selection switch and the PCM.
4. Turn the ignition switch OFF.
5. Disconnect the transmission gear selection switch/park pin switch/A/T gear position indicator panel light connector.
6. Turn the ignition switch ON (II).
7. Verify the transmission gear selection switch upshift switch signal input with the HDS in the A/T data list.
Is UPSHIFT SW ON?
YES - Go to step 8.
NO - Replace the transmission gear selection switch, then go to step 12.
8. Turn the ignition switch OFF.
9. Jump the SCS line with the HDS.
10. Disconnect PCM connector E (31P).
11. Check for continuity between transmission gear selection switch connector terminal No. 7 and body ground.
Is there continuity?
YES - Repair a short to ground in the wire between PCM connector terminal E19 and the transmission gear selection switch, then go to step 12.
NO - Check for loose or poor connections at PCM connector terminal E19. 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.
12. Clear the DTC with the HDS,
13. Start the engine in the P position, wait for more than 10 seconds, then shift to the M position.
14. Push the shift lever toward the upshift position slowly, and release it; repeat this test 10 times or more.
15. Pull the shift lever toward the downshift position (-) slowly, and release it; repeat this test 10 times or more.
16. Monitor the OBD status for P0815 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.
Does the result indicate PASSED?
YES - Troubleshooting is complete.
NO - Return to step 1 and recheck.