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Home >> Toyota >> 2003 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 769 (Automatic Transmission Electronic Controlled (ECT) - A750E/A750F - (1GR-FE) - Diagnostics) >> DTC P0748: Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1) >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2005 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

  1. INSPECT TRANSMISSION WIRE(SL1) 
    1. Disconnect the transmission wire connector from the transmission.
    2. Measure the resistance according to the value(s) in the table below.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition 20°C (68°F)
      12(SL1+)-4(SL1-) 5.0 to 5.6 Ω
      Fig 1: Inspecting Transmission Wire (SL1)
      G02584736Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard (Check for short): 

      TESTER CONNECTION SPECIFIED CONDITION (CHECK FOR SHORT)

      Tester Connection Specified Condition
      12{SL1+) -Body ground 10 kΩ or higher
      4 (SL1-) - Body ground ^
    1. NG: Go to step   3 
    2. OK: GO TO NEXT STEP 
  2. CHECK HARNESS AND CONNECTOR(TRANSMISSION WIRE - ECM) 
    1. Connect the transmission connector to the transmission.
    2. Disconnect the connector from the ECM.
    3. Measure the resistance according to the value(s) in the table below.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition 20°C (68°F)
      E5 - 19 (SL1+) - E5 - 18 (SL1-) 5.0 to 5.6 Ω
    4. Measure the resistance according to the value(s) in the table below.

      Standard (Check for short): 

      TESTER CONNECTION SPECIFIED CONDITION (CHECK FOR SHORT)

      Tester Connection Specified Condition
      E5 - 19 (SL1 +) - Body ground 10 kΩ or higher
      E5 - 18 (SL1-) - Body ground ^
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (SEE  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
    2. OK: GO TO NEXT STEP 

    REPLACE  ECM (1GR-FE) 

    Fig 2: Checking Harness And Connector (Transmission Wire - ECM)
    G02584737Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT SHIFT SOLENOID VALVE(SL1) 
    1. Remove the shift solenoid valve SL1.
    2. Measure the resistance according to the value(s) in the table below.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition 20°C (68°F)
      1 -2 5.0 to 5.6 Ω
    3. Connect the positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector, then check the movement of the valve.

      OK: 

      The solenoid makes an operating sound. 

      Fig 3: Inspecting Shift Solenoid Valve (SL1)
      G02584738Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE SHIFT SOLENOID VALVE(SLI) (SEE  TRANSMISSION VALVE BODY ASSY (A750E/A750F)  ) 
    2. OK: GO TO NEXT STEP 

    REPAIR OR REPLACE  TRANSMISSION WIRE (A750E/A750F)