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