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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 P0778 Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve SL2) >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different variant/trim than selected.
  1. INSPECT TRANSMISSION WIRE (SL2) 
    1. Disconnect the transmission wire connector from the transmission.
    2. Measure the resistance according to the value(s) in TRANSMISSION WIRE (SL2)  .

      Standard resistance 

      TRANSMISSION WIRE (SL2) (RESISTANCE)

      Tester Connection Specified Condition 20°C (68°F)
      10 (SL2+) - 2 (SL2-) 5.0 to 5.6 ohms
      Fig 1: Inspecting Transmission Wire (SL2)
      G04045160Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    3. Measure the resistance according to the value(s) in TERMINAL CONDITION SPECIFIED CONDITION TABLE  .

      Standard resistance (Check for short) 

      TRANSMISSION WIRE (SL2) (CHECK FOR SHORT)

      Tester Connection Specified Condition
      10 (SL2+) - Body ground 10 k ohms or higher
      2 (SL2-) - 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  .

      Standard resistance 

      TRANSMISSION WIRE - ECM (RESISTANCE)

      Tester Connection Specified Condition 20°C (68°F)
      E4-11 (SL2+) - E4-10 (SL2-) 5.0 to 5.6 ohms
      Fig 2: Checking Harness And Connector (Transmission Wire - ECM)
      G04045161Courtesy 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
      E4-11 (SL2+) - Body ground 10 k ohms or higher
      E4-10 (SL2-) - Body ground

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ECM 

  3. INSPECT SHIFT SOLENOID SL2 
    1. Remove the shift solenoid valve SL2.
    2. Measure the resistance according to the value(s) in SHIFT SOLENOID SL2  .

      Standard resistance 

      SHIFT SOLENOID SL2

      Tester Connection Specified Condition 20°C (68°F)
      1 - 2 5.0 to 5.6 ohms
      Fig 3: Inspecting Shift Solenoid SL2
      G04045162Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    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. 

    NG: REPLACE SHIFT SOLENOID SL2 

    OK: REPAIR OR REPLACE TRANSMISSION WIRE