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

Transmission. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
U140F Automatic Transaxle. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL1)

CHECK WIRE HARNESS (TRANSMISSION WIRE - ECM)

INSPECT SHIFT SOLENOID VALVE SL1

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


DESCRIPTION

Shifting from 1st to O/D is performed in combination with the ON and OFF operation of the shift solenoid valves SL1 and SL2, which are 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 valves to allow the vehicle to be operated safely (RAV4_ACA30 RM000000O8L0BCX.html).

DTC No.
DTC Detection Condition
Trouble Area
P0748
Duty cycle to shift solenoid valve SL1 is 100%
(1 trip detection logic)
  1. Open or short in shift solenoid valve SL1 circuit
  2. Shift solenoid valve SL1
  3. ECM

MONITOR DESCRIPTION

This DTC indicates an open or short in the shift solenoid valve SL1 circuit. The ECM commands gear shifts by turning the shift solenoid valves ON/OFF. When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem, illuminates the MIL and stores the DTC. Also, the ECM performs the fail-safe function and turns the other normal shift solenoid valves ON/OFF. In case of an open or short circuit, the ECM stops sending current to the circuit (RAV4_ACA30 RM000000O8L0BCX.html).

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.U140F Automatic Transaxle.Automatic Transaxle System. Dtc P0748 Pressure Control Solenoid A Electrical (Shift Solenoid Valve Sl1)


INSPECTION PROCEDURE

1.INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL1)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.U140F Automatic Transaxle.Automatic Transaxle System. Dtc P0748 Pressure Control Solenoid A Electrical (Shift Solenoid Valve Sl1)

  1. Disconnect the B29 wire connector.

  1. Measure the resistance of the transmission wire.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    5 (SL1+) - 10 (SL1-)
    		20°C (68°F)
    		5.0 to 5.6 Ω
    5 (SL1+) - Body ground
    		20°C (68°F)
    		10 kΩ or higher
    10 (SL1-) - Body ground
    		20°C (68°F)
    		10 kΩ or higher


NG
Go to step 3
OK


2.CHECK WIRE HARNESS (TRANSMISSION WIRE - ECM)

  1. Connect the B29 wire connector.



    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.U140F Automatic Transaxle.Automatic Transaxle System. Dtc P0748 Pressure Control Solenoid A Electrical (Shift Solenoid Valve Sl1)

  1. Disconnect the B32 ECM connector.

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    B32-57 (SL1+) - B32-77 (SL1-)
    		20°C (68°F)
    		5.0 to 5.6 Ω
    B32-57 (SL1+) - Body ground
    		20°C (68°F)
    		10 kΩ or higher
    B32-77 (SL1-) - Body ground
    		20°C (68°F)
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE ECM

3.INSPECT SHIFT SOLENOID VALVE SL1
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.U140F 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 of the solenoid valve.

    Standard resistance:
    5.0 to 5.6 Ωat 20°C (68°F)

  1. Connect the battery's positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector. Then check that the valve moves and makes an operating noise.

    OK:
    Valve moves and makes operating noise.


NG
REPLACE SHIFT SOLENOID VALVE SL1
OK

REPAIR OR REPLACE TRANSMISSION WIRE