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Home >> Lexus >> 2006 >> IS 250 RWD, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Automatic Transmission (A760H)) >> Automatic Transmission System >> 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 transmission.
    2. Measure the resistance according to the value(s) in TERMINAL CONDITION SPECIFIED CONDITION TABLE  .

      Standard resistance 

      TRANSMISSION WIRE (SL1) (RESISTANCE)

      Tester Connection Specified Condition 20°C (68°F)
      11 (SL1+) - 3 (SL1-) 5.0 to 5.6 ohms
    3. Measure the resistance according to the value(s) in TRANSMISSION WIRE - ECM RESISTANCE TABLE  .
    Fig 1: Inspecting Transmission Wire (SL1)
    G04045147Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    Standard resistance (Check for short) 

    TRANSMISSION WIRE (SL1) (CHECK FOR SHORT)

    Tester Connection Specified Condition
    11 (SL1+) - Body ground 10 k ohms or higher
    3 (SL1-) - Body ground

    NG: GO TO STEP   3 

    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 TRANSMISSION WIRE - ECM (RESISTANCE)  .

      Standard resistance 

      TRANSMISSION WIRE - ECM (RESISTANCE)

      Tester Connection Specified Condition 20°C (68°F)
      E4-25 (SL1+) - E4-24 (SL1-) 5.0 to 5.6 ohms
      Fig 2: Checking Harness And Connector (Transmission Wire - ECM)
      G04045148Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    4. Measure the resistance according to the value(s) in TRANSMISSION WIRE - ECM (CHECK FOR SHORT)  .

      Standard resistance (Check for short) 

      TRANSMISSION WIRE - ECM (CHECK FOR SHORT)

      Tester Connection Specified Condition
      E4-25 (SL1+) - Body ground 10 k ohms or higher
      E4-24 (SL1-) - Body ground

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ECM 

  3. INSPECT SHIFT SOLENOID VALVE SL1 
  1. Remove the shift solenoid valve SL1.
  2. Measure the resistance according to the value(s) in TERMINAL CONDITION SPECIFIED CONDITION TABLE  .

    Standard resistance 

    SHIFT SOLENOID VALVE SL1

    Tester Connection Specified Condition 20°C (68°F)
    1 - 2 5.0 to 5.6 ohms
  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.
    4. Fig 3: Checking Continuity Between Solenoid Valve Connector Terminals
    G04088417Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    OK: 

    The solenoid makes an operating sound. 

    NG: REPLACE SHIFT SOLENOID VALVE SL1 

    OK: REPAIR OR REPLACE TRANSMISSION WIRE 

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