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

Drivetrain. Land Cruiser. Urj200, 202 Grj200 Vdj200
Ab60F Automatic Transmission Transaxle. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT NO. 1 TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL1)

CHECK HARNESS AND CONNECTOR (NO. 1 TRANSMISSION WIRE - ECM)

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 the ON and OFF operation of the shift solenoid valves SL1, SL2, S1, S2, S3, S4 and SR, which are controlled by the ECM. If an open or short circuit occurs in the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated safely (Click here).

DTC Code
DTC Detection Condition
Trouble Area
P0748
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).
The output signal duty equals 100%.
HINT:
The SL1 output signal duty is less than 100% under normal conditions.
  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 open or short circuited solenoid.
While driving and shifting between 4th and 5th gears, if the ECM detects an open or short in the shift solenoid valve SL1 circuit, the ECM determines that there is a malfunction (Click here).

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Ab60F Automatic Transmission Transaxle.Automatic Transmission System (For 1Ur-Fe). Dtc P0748 Pressure Control Solenoid A Electrical (Shift Solenoid Valve Sl1)


INSPECTION PROCEDURE


HINT:
The shift solenoid valve SL1 turns ON/OFF normally when the shift lever is in D:

ECM gear shift command
1st
2nd
3rd
4th
5th
6th
Shift solenoid valve SL1
OFF
OFF
OFF
OFF
ON
ON
1.INSPECT NO. 1 TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL1)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Ab60F Automatic Transmission Transaxle.Automatic Transmission System (For 1Ur-Fe). Dtc P0748 Pressure Control Solenoid A Electrical (Shift Solenoid Valve Sl1)

  1. Disconnect the No. 1 transmission wire connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    11 (SL1+) - 3 (SL1-)
    		20°C (68°F)
    		5.0 to 5.6 Ω
    11 (SL1+) - Body ground
    		Always
    		10 kΩ or higher
    3 (SL1-) - Body ground
    		Always
    		10 kΩ or higher
    Text in Illustration
    *a
    		Component without harness connected
    (No. 1 Transmission Wire)


NG
Go to step 3
OK


2.CHECK HARNESS AND CONNECTOR (NO. 1 TRANSMISSION WIRE - ECM)
Land Cruiser. Urj200, 202 Grj200 Vdj200.Ab60F Automatic Transmission Transaxle.Automatic Transmission System (For 1Ur-Fe). Dtc P0748 Pressure Control Solenoid A Electrical (Shift Solenoid Valve Sl1)

  1. Disconnect the ECM connector.

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

    Standard Resistance:
    for LHD
    Tester Connection
    		Condition
    		Specified Condition
    C45-13 (SL1+) - C45-12 (SL1-)
    		20°C (68°F)
    		5.0 to 5.6 Ω
    C45-13 (SL1+) - Body ground
    		Always
    		10 kΩ or higher
    C45-12 (SL1-) - Body ground
    		Always
    		10 kΩ or higher
    for RHD
    Tester Connection
    		Condition
    		Specified Condition
    C46-13 (SL1+) - C46-12 (SL1-)
    		20°C (68°F)
    		5.0 to 5.6 Ω
    C46-13 (SL1+) - Body ground
    		Always
    		10 kΩ or higher
    C46-12 (SL1-) - Body ground
    		Always
    		10 kΩ or higher
Text in Illustration
*1
for LHD
*2
for RHD
*a
Front view of wire harness connector
(to ECM)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (Click here)

3.INSPECT SHIFT SOLENOID VALVE SL1
Land Cruiser. Urj200, 202 Grj200 Vdj200.Ab60F Automatic Transmission Transaxle.Automatic Transmission System (For 1Ur-Fe). 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
    		Condition
    		Specified Condition
    1 - 2
    		20°C (68°F)
    		5.0 to 5.6 Ω

  1. Apply 12 V battery voltage to the shift solenoid valve and check that the valve moves and makes an operating noise.

    OK:
    Measurement Condition
    		Specified Condition
    1. Battery positive (+) with a 21 W bulb → Terminal 1
    2. Battery negative (-) → Terminal 2
    		Valve moves and makes an operating noise
Text in Illustration
*a
Component without harness connected
(Shift Solenoid Valve SL1)


NG
REPLACE SHIFT SOLENOID VALVE SL1 (Click here)
OK

REPAIR OR REPLACE NO. 1 TRANSMISSION WIRE (Click here)