DTC P0748: Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1): Description

WARNING: This page is about a different car, the 2011 Toyota Matrix. However, it is still accessible from the selected car via links, so may be relevant.

Shifting from 1st to 4th (O/D) is performed in combination with "ON" and "OFF" operation of the shift solenoid valves SL1 and SL2 which is controlled by the ECM. If an open or short circuit occurs in either of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the vehicle to be operated smoothly (Fail safe function).

Fig 1: Identifying Pressure Control Solenoid With Graph

DTC No.	DTC Detection Condition	Trouble Area
P0748	The ECM checks for an open or short in the shift solenoid valve SL1 circuit while driving and shift gears. (1-trip detection logic) Output signal duty equals to 100%. (NOTE: SL1 output signal duty is less than 100% under normal condition.)	Open or short in shift solenoid valve SL1 circuit Shift solenoid valve SL1 ECM