DTC Troubleshooting: P1731 (45-3)

DTC P1731:  Problem in Shift Control System:


KE, KG, and KS Models


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 go to 4.


NO - Go to 8.


4.Clear the DTC with the HDS.

5.Test-drive the vehicle in the D position in all four gears at speeds over 20 km/h (12 mph) for more than 20 seconds, then slow down to a stop.

6.Retest-drive the vehicle in the D position in all four gears at speeds over 20 km/h (12 mph) for more than 20 seconds, then slow down to a stop.

7.Check the OBD status in DTC Monitor Tool from DTCs/Freeze Data in A/T Mode Menu for a pass/fail test of code P1731.

Did the result indicate a fail?


YES - Go to 8.


NO - Intermittent failure, the system is OK at this time. If the tester indicates NOT COMPLETE, return to 5 and recheck.n

8.Clear the DTC with the HDS.

9.Choose Shift Solenoid E in Miscellaneous Test Menu, and check that the shift solenoid valve E operates with the HDS.

Is a clicking sound heard?


YES - Go to 10.


NO - Replace shift solenoid valve E, then go to 12.


10.Choose Clutch Pressure Control (Linear) Solenoid A in Miscellaneous Test Menu, and test the A/T clutch pressure control solenoid valve A with the HDS.

Is the system OK?


YES - Intermittent failure, the system is OK at this time. If the tester indicates NOT COMPLETE, return to 10 and recheck.n


NO - Follow instructions indicated on the HDS by the test result, but the tester has not determined the cause of the failure, go to 11. If any part was replaced, go to 12.


11.Inspect A/T clutch pressure control solenoid valve A.

Dose the A/T clutch pressure control solenoid valve A work properly?


YES - Repair hydraulic system related with shift valve E, or replace the transmission, then go to 12.


NO - Replace A/T clutch pressure control solenoid valve A, then go to 12.

12.Clear the DTC with the HDS.

13.Test-drive the vehicle in the D position in all four gears at speeds over 20 km/h (12 mph) for more than 20 seconds, then slow down to a stop.

14.Retest-drive the vehicle in the D position in all four gears at speeds over 20 km/h (12 mph) for more than 20 seconds, then slow down to a stop.

15.Check the OBD status in DTC Monitor Tool from DTCs/Freeze Data in A/T Mode Menu for a pass/fail test of code P1731.

Did the result indicate a pass?


YES - The problem has been corrected.n


NO - Return to 1 and recheck.n