DTC Troubleshooting

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 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 the hydraulic circuit, or replace the transmission, then go to step 10.

6. Test stall speed in the 1 position.

Does the stall speed test 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, then go to step 10.

7. Clear the DTC with the HDS.
8. 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 D position at 10 mph (16 km/h) for 20 seconds, then slow down to a stop.
9. Monitor the OBD STATUS for P0731 in the DTCs MENU with the HDS.

Does the screen 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 screen indicates NOT COMPLETED, return to step 7 and recheck.

10. Reconnect all connectors.
11. Turn the ignition switch ON (II).
12. Clear the DTC with the HDS.
13. 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 D position at speeds over 10 mph (16 km/h) for 20 seconds. Slow down and stop the wheels.
14. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0731 indicated?

YES - Go to step 4.

NO - Go to step 15.

15. Monitor the OBD STATUS for P0731 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete.

NO - Return to step 1 and recheck.