P0731

DTC P0731: Problem in 1st Clutch and 1st 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 shaft 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 contains metal debris or excessive clutch material?
YES: Replace the transmission.
NO: Replace the ATF then 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 1st clutch pressure.
Is the 1st clutch pressure within 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.
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 1st gear in the M position at 10 mph (16 km/h) for 20 seconds.
8. Check the OBD status in DTC Monitor Tool from DTCs/Freeze Data in A/T Mode Menu for a pass/fail test of code P0731.
Did the result indicate a fail?
YES: Repair the 1st clutch, or replace the transmission.
NO: Intermittent failure, the system is OK at this time. If the tester indicates NOT COMPLETE, return to step 7 and recheck.