DTC P1734: Problem in Shift Control System

Shift Solenoid Valves B or C Stuck OFF
Shift Valves B or C Stuck

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, and review GENERAL TROUBLESHOOTING INFORMATION .

Warm up the engine to normal operating temperature (the radiator fan comes on).
Make sure that the transmission is filled to the proper level, and check for fluid leaks.
Drain the ATF (see step 3 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 15.

NO -Replace the ATF (see ATF REPLACEMENT ), then go to step 4.
Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Test-drive the vehicle with the shift lever in D, and let the transmission shift through all five gears.
Monitor the OBD STATUS for P1734 in the DTCs MENU with the HDS.
Does the HDS indicate FAILED?

YES -Go to step 8.

NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. If the HDS indicates NOT COMPLETED, go to step 6.
Clear the DTC with the HDS.
Select Shift Solenoid Valve B in the Miscellaneous Test Menu, and check that shift solenoid valve B operates with the HDS.
Is a clicking sound heard?

YES -Go to step 10.

NO -Replace shift solenoid valve B (see SHIFT SOLENOID VALVE TEST, REPLACEMENT, AND SHIFT SOLENOID WIRE HARNESS REPLACEMENT ), then go to step 13.
Select Shift Solenoid Valve C in the Miscellaneous Test Menu, and check that shift solenoid valve C operates with the HDS.
Is a clicking sound heard?

YES -Go to step 11.

NO -Replace shift solenoid valve C (see SHIFT SOLENOID VALVE TEST, REPLACEMENT, AND SHIFT SOLENOID WIRE HARNESS REPLACEMENT ), then go to step 13.
Test-drive the vehicle with the shift lever in D, and let the transmission shift through all five gears.
Monitor the OBD STATUS for P1734 in the DTCs MENU with the HDS.
Does the HDS indicate FAILED?

YES -Repair the hydraulic system related to shift valves B and C, or replace the transmission, then go to step 15.

NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. If the HDS indicates NOT COMPLETED, go to step 11.
Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Test-drive the vehicle with the shift lever in D, and let the transmission shift through all five gears.
Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1734 indicated?

YES -Go to step 8.

NO -Go to step 17.
Monitor the OBD STATUS for P1734 in the DTCs MENU with the HDS.
Does the HDS indicate PASSED?

YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 16, go to the indicated DTC'S TROUBLESHOOTING .

NO -If the HDS indicates FAILED, go to step 8. If the HDS indicates NOT COMPLETED, go to step 15.