Automatic Transmission

DTC P0734: Problem in 4th Clutch and 4th Clutch Hydraulic Circuit (4th gear incorrect ratio)

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review General Troubleshooting Information.

1. Warm up the engine to normal operating temperature (the radiator fan comes on).
2. Make sure that the transmission is filled to the proper level, and check for fluid leaks.
3. Drain the ATF through a strainer. Inspect the strainer for metal debris or excessive clutch material.

Does the strainer have metal debris or excessive clutch material?

YES - Replace the transmission, then go to step 10.

NO - Replace the ATF, then go to step 4.

4. Measure the line pressure.

Is the line pressure within the service limit?

YES - Go to step 5.

NO - Repair the ATF pump and the regulator valve, or replace the transmission, then go to step 10.

5. Measure the 4th clutch pressure.

Is the 4th clutch pressure within the service limit?

YES - Go to step 6.

NO - Shift valves A, B, C, and D are stuck. Repair the shift valves and the hydraulic circuit, or replace the transmission, then go to step 10.

6. Clear the DTC with the HDS.
7. Test-drive the vehicle in 4th gear in D for at least 12 seconds.
8. Turn the ignition switch to LOCK (0), and repeat the test-drive in step 7.
9. Monitor the OBD STATUS for P0734 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - Intermittent failure, the system is OK at this time.

NO - If the screen indicates FAILED, repair the 4th clutch, or replace the transmission, then go to 10. If the screen indicates NOT COMPLETED, return to step 7 and recheck.

10. Turn the ignition switch to ON (II).
11. Clear the DTC with the HDS.
12. Test-drive the vehicle in 4th gear in D for at least 12 seconds.
13. Turn the ignition switch to LOCK (0), and repeat the test-drive in step 12.
14. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0734 indicated?

YES - Go to step 4.

NO - If Temporary DTC or DTC P0734 is not indicated, or if any other Temporary DTCs are indicated, go to step 15.

15. Monitor the OBD STATUS for P0734 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete. If any other Temporary DTC or DTCs were indicated on step 14, go to the indicated DTCs troubleshooting.

NO - If the screen indicates FAILED, then go to step 4. If the screen indicates NOT COMPLETED, go to step 12.