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Home >> Lexus >> 2008 >> GS 460 >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle >> 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) >> Inspection Procedure

Inspection Procedure

HINT:

The shift solenoid valves SL1, 2, 3, 4 and 5 turn ON/OFF normally when the shift lever is on D:

Shift Solenoid Valve Operation:

GEAR POSITIONS REFERENCE

Gear Position 1st 2nd 3rd 4th 5th 6th 7th 8th
Shift Solenoid Valve SL1 ON ON ON ON ON OFF OFF OFF
Shift Solenoid Valve SL2 OFF OFF OFF OFF ON ON ON ON
Shift Solenoid Valve SL3 OFF OFF ON OFF OFF OFF ON OFF
Shift Solenoid Valve SL4 OFF OFF OFF ON OFF ON OFF OFF
Shift Solenoid Valve SL5 OFF ON OFF OFF OFF OFF OFF ON
  1. CHECK HARNESS AND TRANSMISSION WIRE (TRANSMISSION WIRE - TCM, TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL1, 2, 3,4 AND 5)) 
    1. Disconnect the TCM connector.
    2. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      E88-6 (SL1+) - E88-5 (SL1-) 20°C (68°F) 5.0 to 5.6 Ω
      E88-4 (SL2+) - E88-14 (SL2-) 20°C (68°F) 5.0 to 5.6 Ω
      E88-26 (SL3+) - E88-25 (SL3-) 20°C (68°F) 5.0 to 5.6 Ω
      E88-17 (SL4+) - E88-16 (SL4-) 20°C (68°F) 5.0 to 5.6 Ω
      E88-3 (SL5+) - E88-10 (SL5-) 20°C (68°F) 5.0 to 5.6 Ω
      E88-6 (SL1+) or E88-S (SL1-) - Body ground Always 10 kΩ or higher
      E88-4 (SL2+) or E88-14 (SL2-) - Body ground Always 10 kΩ or higher
      E88-26 (SL3+) or E88-25 (SL3-) - Body ground Always 10 kΩ or higher
      E88-17 (SL4+) or E88-16 (SL4-) - Body ground Always 10 kΩ or higher
      E88-3 (SL5+) or E88-10 (SL5-) - Body ground Always 10 kΩ or higher
      Fig 1: Identifying Terminals Of E88 TCM Connector
      G05806252Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG :  Go to step  3

    OK : Go to Next Step 

  2. REPLACE TCM 
    1. Replace the TCM (see REMOVAL  ).

    NEXT : PERFORM A/T CODE REGISTRATION  (See REGISTRATION  )

  3. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - TCM) 
    1. Disconnect the transmission wire connector.
    2. Disconnect the TCM connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      E105-23 (SL1+) - E88-6 (SL1+) Always Below 1 Ω
      E105-24 (SL1-) - E88-5 (SL1-) Always Below 1 Ω
      E105-28 (SL2+) - E88-4 (SL2+) Always Below 1 Ω
      E105-29 (SL2-) - E88-14 (SL2-) Always Below 1 Ω
      E105-25 (SL3+) - E88-26 (SL3+) Always Below 1 Ω
      E105-26 (SL3-) - E88-25 (SL3-) Always Below 1 Ω
      E105-15 (SL4+) - E88-17 (SL4+) Always Below 1 Ω
      E105-16 (SL4-) - E88-16 (SL4-) Always Below 1 Ω
      E105-5 (SL5+) - E88-3 (SL5+) Always Below 1 Ω
      E105-6 (SL5-) - E88-10 (SL5-) Always Below 1 Ω
      E105-23 (SL1+) or E88-6 (SL1+) - Body ground Always 10 kΩ or higher
      E105-24 (SL1-) or E88-5 (SL1-) - Body ground Always 10 kΩ or higher
      E105-28 (SL2+) or E88-4 (SL2+) - Body ground Always 10 kΩ or higher
      E105-29 (SL2-) or E88-14 (SL2-) - Body ground Always 10 kΩ or higher
      E105-25 (SL3+) or E88-26 (SL3+) - Body ground Always 10 kΩ or higher
      E105-26 (SL3-) or E88-25 (SL3-) - Body ground Always 10 kΩ or higher
      E105-15 (SL4+) or E88-17 (SL4+) - Body ground Always 10 kΩ or higher
      E105-16 (SL4-) or E88-16 (SL4-) - Body ground Always 10 kΩ or higher
      E105-5 (SL5+) or E88-3 (SL5+) - Body ground Always 10 kΩ or higher
      E105-6 (SL5-) or E88-10 (SL5-) - Body ground Always 10 kΩ or higher
      Fig 2: Identifying Terminals Of E105 Transmission Wire Connector
      G05806253Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK : Go to Next Step 

  4. INSPECT SHIFT SOLENOID VALVE SL1, 2, 3, 4 AND 5 
    1. Remove the shift solenoid valves (see DISASSEMBLY  ).
    2. Measure the resistance of the shift solenoid valves.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      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 the battery's positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector. Then check that the valve moves and makes an operating sound.

      OK: 

      Valve moves and makes operating sound. 

    NG : REPLACE SHIFT SOLENOID VALVE  (See DISASSEMBLY  )

    Fig 3: Inspecting Shift Solenoid Valve SL1, 2, 3, 4 And 5
    G04948331Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : REPAIR OR REPLACE TRANSMISSION WIRE  (See REMOVAL  )

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