Automatic Transmission

DTC P0731: Problem in 1st Clutch and 1st Clutch Hydraulic Circuit (1st 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 11.

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 11.

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 the hydraulic circuit, or replace the transmission, then go to step 11.

6. Test stall speed in the 1 position.

Is the stall speed within the service limits?

YES - Go to step 7.

NO - Shift valves A and D are stuck. Repair these valves and the hydraulic circuit, or replace the transmission.

7. Clear the DTC with the HDS.
8. Test-drive the vehicle in 1st gear in D for at least 12 seconds.
9. Turn the ignition switch to LOCK (0), and repeat the test-drive in step 8.
10. Monitor the OBD STATUS for P0731 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 1st clutch, or replace the transmission, then go to step 11. If the screen indicates NOT COMPLETED, return to step 8 and recheck.

11. Reconnect all connectors.
12. Turn the ignition switch to ON (II).
13. Clear the DTC with the HDS.
14. Test-drive the vehicle in 1st gear in D for at least 12 seconds.
15. Turn the ignition switch to LOCK (0), and repeat the test-drive in step 14.
16. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0731 indicated?

YES - Go to step 4.

NO - If Temporary DTC or DTC P0731 is not indicated, or if any other Temporary DTCs are indicated, go to step 17.

17. Monitor the OBD STATUS for P0731 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 16, 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 14.