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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Automatic Transmission Electronic Controlled (ECT) - U241E/U140F - Diagnostics) >> DTC P0748: Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1) >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different variant/trim than selected.
  1. INSPECT TRANSMISSION WIRE (SL1) 
    1. Disconnect the transmission wire connector from the transaxle.
    2. Measure the resistance according to the value (s) in the table below.

      Standard: 

      SPECIFIED CONDITION

      Tester Connection Specified Condition 20 "C (68°F)
      5 (SL1+)- 10 (SL1-) 5.0 to 5.6Ω
    3. Measure the resistance according to the value (s) in the table below.
      Fig 1: Tester Specification
      G02908808Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard (Check for short): 

      Fig 2: Inspecting Transmission Wire (SL1)
      G02908809Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 transaxle.
    2. Disconnect the connector from the ECM.
    3. Measure the resistance according to the value (s) in the table below.

      Standard: 

      SPECIFIED CONDITION

      Tester Connection Specified Condition 20°C (68°F)
      E8 - 19 (SL1+) - E8 - 18 (SL1-) 5.0 to 5.6Ω
      Fig 3: Tester Specification
      G02908810Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the resistance according to the value (s) in the J table below.

      Standard (Check for short): 

      Fig 4: Checking Harness And Connector (Transmission Wire - ECM)
      G02908811Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
    2. OK: REPLACE ECM (See  REPLACEMENT  ) 
  3. INSPECT SHIFT SOLENOID VALVE (SLI) 
    1. Remove the shift solenoid valve SL1.
    2. Measure the resistance according to the value (s) in the table below.

      Standard: 

      SPECIFIED CONDITION

      Tester Connection Specified Condition 20°C (68°F)
      1 - 2 5.0 to 5.6Ω
    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 noise. 

      Fig 5: Inspecting Shift Solenoid Valve (SLI)
      G02908812Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE SHIFT SOLENOID VALVE (SLI) 
    2. OK: REPAIR OR REPLACE TRANSMISSION WIRE (See  REPLACEMENT  ) 
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