Advanced Diagnostics

DTC P1745: Problem in Shift Control System: Servo Control Valve Stuck OFF or Servo Valve Stuck OFF







General Description
The servo control valve and the servo valve are incorporated into the control circuit of the transmission. The servo control valve and the servo valve operate when the shift lever is in the D, D3, or M position due to line pressure and turn off when the shift lever is in the P, R, or N position.

The PCM monitors the mainshaft speed and the countershaft speed at the gear change determined by the shift schedule. When an improper gear ratio is output compared to the predetermined gear change mode, a servo control valve OFF or servo valve OFF failure is detected and a DTC is stored.




Monitor Execution, Sequence, Duration, DTC Type, OBD Status




Enable Conditions







Malfunction Threshold
One of these symptoms occurs.

Driving Pattern
Start the engine, and accelerate the vehicle until the transmission shifts into 5th gear in the D position.

- Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

Diagnosis Details

Conditions for illuminating the MIL
When a malfunction is detected during the first drive cycle, a Temporary DTC is stored in the PCM memory. If the malfunction recurs during the next (second) drive cycle, the DTC and the freeze frame data are stored. The MIL does not come on.

Conditions for clearing the MIL
The DTC, the Temporary DTC, and the freeze frame data can be cleared by using the scan tool Clear command or by disconnecting the battery.