DTC Troubleshooting: P1734 (45-6)

DTC P1734:  Problem in Shift Control System:


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 strainer for metal debris or excessive clutch material.

Does the strainer contain metal debris or excessive clutch material?


YES - Replace the transmission.n


NO - Replace ATF, then go to 4.


4.Clear the DTC with the HDS.

5.Test-drive the vehicle in the D position in all five 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 five 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 P1734.

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 B in Miscellaneous Test Menu, and check that the shift solenoid valve B operates with the HDS.

Is a clicking sound heard?


YES - Go to 10.


NO - Replace shift solenoid valve B, then go to 14.


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

Is a clicking sound heard?


YES - Go to 11.


NO - Replace shift solenoid valve C, then go to 14.


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

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

13.Check the OBD status in DTC Monitor Tool from DTCs/Freeze Data in A/T Mode Menu for a pass/fail test of code P1734.

Did the result indicate a fail?


YES - Repair hydraulic system related with shift valves B and C, or replace the transmission, then go to 14.


NO - Intermittent failure, the system is OK at this time. If the tester indicates NOT COMPLETE, return to 11 and recheck.n

14.Clear the DTC with the HDS.

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

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

17.Check the OBD status in DTC Monitor Tool from DTCs/Freeze Data in A/T Mode Menu for a pass/fail test of code P1734.

Did the result indicate a pass?


YES - The problem has been corrected.n


NO - Return to 8 and recheck.n