P0872
DTC P0872: Short in 4th Clutch Transmission Fluid Pressure Switch Circuit, or 4th Clutch Transmission Fluid Pressure Switch Stuck ONNOTE:
^ Record all freeze data 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. Clear the DTC with the HDS.
2. Check the 4th PRES SWITCH signal with the HDS in the A/T data list when not in 4th gear.
Is the 4th PRES SWITCH ON?
YES - Go to step 3.
NO - Go to step 5.
3. Start the engine, and warm it up to normal operating temperature (the radiator fan comes on). Drive the vehicle in 4th gear in the D position for about 5 seconds. Slow down and stop the wheels.
4. Monitor the OBD status for P0872 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.
Does the result indicate FAILED?
YES - Go to step 5.
NO - Intermittent failure, the system is OK at this time. Check the BLU/YEL wire for an intermittent short to ground between the 4th clutch transmission fluid pressure switch and PCM. If the tester indicates NOT COMPLETED, return to step 3 and recheck.
5. Turn the ignition switch OFF.
6. Disconnect the 4th clutch transmission fluid pressure switch connector.
7. Turn the ignition switch ON (II).
8. Check the 4th PRES SWITCH signal with the HDS in the A/T data list.
Is the 4th PRES SWITCH OFF?
YES - Replace the 4th clutch transmission fluid pressure switch, then go to step 13.
NO - Go to step 9.
9. Turn the ignition switch OFF.
10. Jump the SCS line with the HDS.
11. Disconnect PCM connector C (22P).
12. Check for continuity between PCM connector terminal C13 and body ground.
Is there continuity?
YES - Repair short to ground in the wire between PCM connector terminal C13 and the 4th clutch transmission fluid pressure switch, then go to step 13.
NO - 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.
13. Clear the DTC with the HDS.
14. Start the engine, and warm it up to normal operating temperature (the radiator fan comes on). Drive the vehicle in 4th gear in the D position for about 5 seconds. Slow down and stop the wheels.
15. Monitor the OBD status for P0872 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.
Does the result indicate PASSED?
YES - Troubles hooting is complete.
NO - Return to step 1 and recheck.