Dtc P0748 Pressure Control Solenoid A Electrical (Shift Solenoid Valve Sl1)

Transmission. Camry. Acv40 Gsv40
U660E Automatic Transaxle. Camry. Acv40 Gsv40

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT TRANSMISSION WIRE (SL1)

INSPECT SHIFT SOLENOID VALVE SL1

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


DESCRIPTION

Shifting from 1st to 6th is performed in combination with "ON" and "OFF" operation of the shift solenoid valves SL1, SL2, SL2, SL3, SL4 and SL which is controlled by the TCM. If an open or short circuit occurs in any of the shift solenoid valves, the TCM controls the remaining normal shift solenoid valves to allow the vehicle to be operated smoothly (CAMRY_ACV40 RM000000O8L02IX.html).

DTC No.
DTC Detection Condition
Trouble Area
P0748
The TCM checks for an open or short in the shift solenoid valve SL1 circuit while driving and shifting between 4th and 5th gears. (1-trip detection logic)
  1. Output signal duty equals 100%.
    (NOTE: SL1 output signal duty is less than 100% under normal condition.)
  1. Open or short in shift solenoid valve SL1 circuit
  2. Shift solenoid valve SL1
  3. TCM

MONITOR DESCRIPTION

This DTC indicates an open or short in the shift solenoid valve SL1 circuit. The TCM causes gear shifts to occur by turning the shift solenoid valves on or off. When there is an open or short circuit in any shift solenoid valve circuit, the TCM detects the problem and illuminates the MIL and stores the DTC. The TCM also performs the fail-safe function and turns the other normal shift solenoid valves on or off. (In case of an open or short circuit, the TCM stops sending current to the circuit.)
While driving and shifting between 4th and 5th gears, if the TCM detects an open or short in the shift solenoid valve SL1 circuit, the TCM determines there is a malfunction (CAMRY_ACV40 RM000000O8L02IX.html).

WIRING DIAGRAM


Camry. Acv40 Gsv40.U660E Automatic Transaxle.Automatic Transaxle System. Dtc P0748 Pressure Control Solenoid A Electrical (Shift Solenoid Valve Sl1)


INSPECTION PROCEDURE


HINT:
The shift solenoid valve SL1 is turned on or off automatically when the shift lever is in the D position:

TCM command gearshift
1st
2nd
3rd
4th
5th
6th
Shift solenoid valve SL1
ON
ON
ON
ON
OFF
OFF
1.INSPECT TRANSMISSION WIRE (SL1)


    Camry. Acv40 Gsv40.U660E Automatic Transaxle.Automatic Transaxle System. Dtc P0748 Pressure Control Solenoid A Electrical (Shift Solenoid Valve Sl1)

  1. Remove the TCM from the transaxle.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Specified Condition
    20°C (68°F)
    14 (SL1+) - 13 (SL1-)
    		5.0 to 5.6 Ω

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Check for short:
    Tester Connection
    		Specified Condition
    14 (SL1+) - Body ground
    		10 kΩ or higher
    13 (SL1-) - Body ground
    		10 kΩ or higher


OK
REPLACE TCM
NG


2.INSPECT SHIFT SOLENOID VALVE SL1
Camry. Acv40 Gsv40.U660E Automatic Transaxle.Automatic Transaxle System. Dtc P0748 Pressure Control Solenoid A Electrical (Shift Solenoid Valve Sl1)

  1. Remove the shift solenoid valve SL1.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Specified Condition
    20°C (68°F)
    1 - 2
    		5.0 to 5.6 Ω

  1. Connect a positive (+) lead through a 21 W bulb to terminal 2 and a negative (-) lead to terminal 1 of the solenoid valve connector, then check the movement of the valve.

    OK:
    The solenoid makes an operating sound.


NG
REPLACE SHIFT SOLENOID VALVE SL1
OK

REPLACE TRANSMISSION WIRE