DTC P0748: Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1) [04/2013 - 06/2014]: Description

WARNING: This page is about a different car, the 2015 Lexus IS 250 and 2014 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.

Shifting from 1st to 6th gear is performed in combination with "ON" and "OFF" operation of the shift solenoid valves SL1, SL2, S1, S2, S3, S4 and SR which is controlled by the ECM. If an open or short circuit occurs in any of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the gears to be shifted smoothly.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P0748	Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1)	The ECM checks for an open or short in the shift solenoid valve SL1 circuit while driving and shifting between 4th and 5th gear. (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	Comes on	DTC stored