Automatic Transmission

DTC P0731: Problem in 1st Clutch and 1st Clutch Hydraulic Circuit

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 then 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 limits?

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 1st clutch pressure.

Is the 1st clutch pressure within the service limits?

YES - Go to step 6.

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

6. Clear the DTC with the HDS.
7. Test-drive the vehicle: Start off in D, accelerate at 10% opened throttle or more, and run the vehicle in 1st gear at speeds over 7 mph (12 km/h) with the engine speed at 1,000 rpm or higher, for at least 12 seconds. Slow down and stop the wheels.
8. Turn the ignition switch to LOCK (0). Repeat the test-drive in step 7, then go to step 9.
9. Monitor the OBD STATUS for P0731 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

Does the result indicate FAILED?

YES - Repair the 1st clutch, or replace the transmission, then go to step 10.

NO - If the screen indicates PASSED, intermittent failure, the system is OK at this time. If the HDS indicates NOT COMPLETED, return to step 7 and recheck.

10. Test-drive the vehicle: Start off in D, accelerate at 10% opened the throttle or more, and run the vehicle in 1st gear at speeds over 7 mph (12 km/h) with the engine speed at 1,000 rpm or higher, for at least 12 seconds. Slow down and stop the wheels.
11. Turn the ignition switch to LOCK (0). Repeat the test-drive in step 10, then go to step 12.
12. Monitor the OBD STATUS for P0731 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

Does the result indicate PASSED?

YES - Troubleshooting is complete.

NO - If the HDS indicates FAILED, return to step 1 and recheck. If the HDS indicates NOT COMPLETED, return to step 10 and recheck.