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Home >> Toyota >> 2009 >> Corolla S, 1.8 L, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Automatic Transmission - U250E) >> Automatic Transaxle 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 transaxle.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION

      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) 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      6 (SL1+) - Body ground Always 10 kΩ or higher
      13 (SL1-) - Body ground Always
      Fig 1: Identifying B93 Connector Terminals
      G06011380Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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 transaxle.
    2. Disconnect the connector from the ECM.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      B31-57 (SL1+) - B31-77 (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) 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      B31-57 (SL1+) - Body ground Always 10 kΩ or higher
      B31-77 (SL1-) - Body ground Always
      Fig 2: Identifying B31 Connector Terminals
      G06011371Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: REPLACE ECM  (See FAIL-SAFE CHART )

  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 resistance 

      RESISTANCE SPECIFICATION

      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: REPLACE SHIFT SOLENOID VALVE SL1  (See DISASSEMBLY )

      Fig 3: Inspecting Shift Solenoid Valve SL1
      G04963194Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: REPAIR OR REPLACE TRANSMISSION WIRE  (See REMOVAL )