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Home >> Lexus >> 2017 >> IS 300 F Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 102 (Automatic Transmission System (Aa80E) - Diagnostic Codes (1 Of 2)) >> Automatic Transmission System >> DTC P0748: Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1); DTC P0778: Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve SL2); DTC P0798: Pressure Control Solenoid "C" Electrical (Shift Solenoid Valve SL3); DTC P2810: Pressure Control Solenoid "G" Electrical (Shift Solenoid Valve SL4); DTC P2819: Pressure Control Solenoid "H" Electrical (Shift Solenoid Valve SL5) [11/2021 - ] >> Procedure

DTC P0748: Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1); DTC P0778: Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve SL2); DTC P0798: Pressure Control Solenoid "C" Electrical (Shift Solenoid Valve SL3); DTC P2810: Pressure Control Solenoid "G" Electrical (Shift Solenoid Valve SL4); DTC P2819: Pressure Control Solenoid "H" Electrical (Shift Solenoid Valve SL5) [11/2021 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus IS 500, 2023 Lexus IS 500, and 2022 Lexus IS 500. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK HARNESS AND TRANSMISSION WIRE (TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL1, 2, 3, 4 AND 5) - TCM) 
    1. Disconnect the F156 TCM connector.
      GTY1083066Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to TCM)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F156-6 (SL1+) - F156-5 (SL1-) 20°C (68°F) 5.0 to 5.6 Ω
      F156-4 (SL2+) - F156-14 (SL2-) 20°C (68°F) 5.0 to 5.6 Ω
      F156-26 (SL3+) - F156-25 (SL3-) 20°C (68°F) 5.0 to 5.6 Ω
      F156-17 (SL4+) - F156-16 (SL4-) 20°C (68°F) 5.0 to 5.6 Ω
      F156-3 (SL5+) - F156-10 (SL5-) 20°C (68°F) 5.0 to 5.6 Ω
      F156-6 (SL1+) or F156-5 (SL1-) - Body ground Always 10 kΩ or higher
      F156-4 (SL2+) or F156-14 (SL2-) - Body ground Always 10 kΩ or higher
      F156-26 (SL3+) or F156-25 (SL3-) - Body ground Always 10 kΩ or higher
      F156-17 (SL4+) or F156-16 (SL4-) - Body ground Always 10 kΩ or higher
      F156-3 (SL5+) or F156-10 (SL5-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  3

    Result: 

    OK 

    See step  2

  2. REPLACE TCM 
    1. Replace the TCM.

      Refer to COMPONENTS [11/2021 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    PERFORM A/T CODE REGISTRATION. Refer to  REGISTRATION [11/2021 - ] 

  3. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - TCM) 
    1. Disconnect the F175 transmission wire connector.
    2. Disconnect the F156 TCM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F175-23 (SL1+) - F156-6 (SL1+) Always Below 1 Ω
      F175-24 (SL1-) - F156-5 (SL1-) Always Below 1 Ω
      F175-28 (SL2+) - F156-4 (SL2+) Always Below 1 Ω
      F175-29 (SL2-) - F156-14 (SL2-) Always Below 1 Ω
      F175-25 (SL3+) - F156-26 (SL3+) Always Below 1 Ω
      F175-26 (SL3-) - F156-25 (SL3-) Always Below 1 Ω
      F175-15 (SL4+) - F156-17 (SL4+) Always Below 1 Ω
      F175-16 (SL4-) - F156-16 (SL4-) Always Below 1 Ω
      F175-5 (SL5+) - F156-3 (SL5+) Always Below 1 Ω
      F175-6 (SL5-) - F156-10 (SL5-) Always Below 1 Ω
      F175-23 (SL1+) or F156-6 (SL1+) - Body ground Always 10 kΩ or higher
      F175-24 (SL1-) or F156-5 (SL1-) - Body ground Always 10 kΩ or higher
      F175-28 (SL2+) or F156-4 (SL2+) - Body ground Always 10 kΩ or higher
      F175-29 (SL2-) or F156-14 (SL2-) - Body ground Always 10 kΩ or higher
      F175-25 (SL3+) or F156-26 (SL3+) - Body ground Always 10 kΩ or higher
      F175-26 (SL3-) or F156-25 (SL3-) - Body ground Always 10 kΩ or higher
      F175-15 (SL4+) or F156-17 (SL4+) - Body ground Always 10 kΩ or higher
      F175-16 (SL4-) or F156-16 (SL4-) - Body ground Always 10 kΩ or higher
      F175-5 (SL5+) or F156-3 (SL5+) - Body ground Always 10 kΩ or higher
      F175-6 (SL5-) or F156-10 (SL5-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - TCM) 

    Result: 

    OK 

    See step  4

  4. INSPECT SHIFT SOLENOID VALVE SL1, 2, 3, 4 AND 5 
    1. Remove the shift solenoid valves.
      GTY464572Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Shift Solenoid Valves SL1, 2, 3, 4 and 5)

      Refer to DISASSEMBLY [11/2021 - ]

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Terminal 1 of the shift solenoid valve SL1 - terminal 2 20°C (68°F) 5.0 to 5.6 Ω
      Terminal 1 of the shift solenoid valve SL2 - terminal 2 20°C (68°F) 5.0 to 5.6 Ω
      Terminal 1 of the shift solenoid valve SL3 - terminal 2 20°C (68°F) 5.0 to 5.6 Ω
      Terminal 1 of the shift solenoid valve SL4 - terminal 2 20°C (68°F) 5.0 to 5.6 Ω
      Terminal 1 of the shift solenoid valve SL5 - terminal 2 20°C (68°F) 5.0 to 5.6 Ω
    3. Connect a positive (+) lead from the battery with a 21 W bulb to terminal 2 and a negative (-) lead to terminal 1 of the solenoid valve connector. Check that the valve moves and makes an operating sound.

      OK

      Valve moves and makes an operating sound.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPAIR OR REPLACE TRANSMISSION WIRE. Refer to  COMPONENTS [11/2021 - ] 

    Result: 

    NG 

    REPLACE SHIFT SOLENOID VALVE. Refer to  COMPONENTS [11/2021 - ] 

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