P0734

DTC P0734: Problem in 4th Clutch and 4th Clutch Hydraulic Circuit

NOTE: Record all freeze data and review General Troubleshooting Information before you troubleshoot.

1. Warm up the engine to normal operating temperature (the radiator fan comes on).
2. Check to be sure that the transmission is filled to the proper level, and check for fluid leaks.
3. Drain the ATF through a strainer. Inspect the ATF and strainer for metal debris or burnt fluid.
Has the ATF deteriorated?
YES - Replace ATF, and test-drive the vehicle under the same conditions as those indicated by the freeze data, then recheck.
NO - Go to step 4.
4. Measure the line pressure.
Is the line pressure within service limits?
YES - Go to step 5.
NO - Repair the ATF pump and regulator valve, or replace the transmission.
5. Measure the 4th clutch pressure.
Is the 4th clutch pressure within service limits?
YES - Go to step 6.
NO - Shift valve B, shift valve C, servo control valve, and servo valve are stuck. Repair these valves and hydraulic circuit, or replace the transmission.
6. Clear the DTC with the HDS.
7. Test-drive the vehicle for several minutes under the same conditions as those indicated by the freeze data, or drive in the 4th gear in the [M] position at speeds over 10 mph (16 km/h) for 20 seconds.
8. Check the OBD STATUS in DTC's MENU for a pass/fail test of code P0734.
Did the result indicate a fail?
YES - Repair the 4th clutch, or replace the transmission.
NO - Intermittent failure, the system is OK at this time. If the tester indicates NOT COMPLETE, return to step 1 and recheck.