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Home >> Toyota >> 2012 >> Corolla S, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 209 (Automatic Transmission (U250E) (Diagnostic Codes (P0705 - P2770) & Circuit Tests)) >> Automatic Transaxle System >> DTC P0748: Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1) >> Procedure

DTC P0748: Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1): Procedure

WARNING: This page is about a different car, the 2011 Toyota Matrix. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT TRANSMISSION WIRE (SL1) 
    1. Disconnect the transmission wire connector from the transaxle.
      Fig 1: Inspecting Transmission Wire B31 Connector Terminals
      GTY242974Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      6 (SL1+) - 13 (SL1-) 20°C (68°F) 5.0 to 5.6 Ω
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for short)

      Tester Connection Condition Specified Condition
      6 (SL1+) - Body ground Always 10 kΩ or higher
      13 (SL1-) - Body ground Always

    NG → See step   3 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) 
    1. Connect the transmission wire connector to the transaxle.
      Fig 2: Checking ECM B29 Connector Terminals
      GTY238445Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the connector from the ECM.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      B29-57 (SL1+) - B29-77 (SL1-) 20°C (68°F) 5.0 to 5.6 Ω
    4. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for short)

      Tester Connection Condition Specified Condition
      B29-57 (SL1+) - Body ground Always 10 kΩ or higher
      B29-77 (SL1-) - Body ground Always

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   5 

  3. INSPECT SHIFT SOLENOID VALVE SL1 
    1. Remove the shift solenoid valve SL1.
      Fig 3: Inspecting Shift Solenoid Valve SL1
      GTY101064Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. 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
    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 → See step   6 

    OK → See step   4 

  4. REPAIR OR REPLACE TRANSMISSION WIRE. Refer to  REMOVAL 
  5. REPLACE ECM. Refer to  REMOVAL 
  6. REPLACE SHIFT SOLENOID VALVE SL1. Refer to  DISASSEMBLY 
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