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Home >> Lexus >> 2008 >> IS F >> 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 following table shows normal operation of the shift solenoid valves SL1, 2, 3, 4 and 5 when the shift lever is in D

Shift Solenoid Valve Operation

SHIFT SOLENOID VALVE OPERATION

Gear 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 according to the value (s) in the table below

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      E59-6 (SL1+) - E59-5 (SL1-) 20°C (68°F) 5.0 to 5.6 Ω
      E59-4 (SL2+) - E59-14 (SL2-) 20°C (68°F) 5 0 to 5 6 Ω
      E59-26 (SL3+) - E59-25 (SL3-) 20°C (68°F) 5 0 to 5 6 Ω
      E59-17 (SL4+) - E59-16 (SL4-) 20°C (68°F) 5 0 to 5 6 Ω
      E59-3 (SL5+) - E59-10 (SL5-) 20°C (68°F) 5 0 to 5.6 Ω
      E59-6 (SL1+) or E59-5 (SL1-) - Body ground Always 10 kΩ or higher
      E59-4 (SL2+) or E59-14 (SL2-) - Body ground Always 10 kΩ or higher
      E59-26 (SL3+) or E59-25 (SL3-) - Body ground Always 10 kΩ or higher
      E59-17 (SL4+) or E59-16 (SL4-) - Body ground Always 10 kΩ or higher
      E59-3 (SL5+) or E59-10 (SL5-) - Body ground Always 10 kΩ or higher
      3. Fig 1: Identifying E59 TCM Connector Terminal
      G05750729Courtesy 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 according to the value (s) in the table below
      Fig 2: Identifying E47 Transmission Wire And E59 TEM Connector Terminal
      G05750730Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      E47-23 (SL1+) - E59-6 (SL1+) Always Below 1 Ω
      E47-24 (SL1-) - E59-5 (SL1-) Always Below 1 Ω
      E47-28 (SL2+) - E59-4 (SL2+) Always Below 1 Ω
      E47-29 (SL2-) - E59-14 (SL2-) Always Below 1 Ω
      E47-25 (SL3+) - E59-26 (SL3+) Always Below 1 Ω
      E47-26 (SL3-) - E59-25 (SL3-) Always Below 1 Ω
      E47-15 (SL4+) - E59-17 (SL4+) Always Below 1 Ω
      E47-16 (SL4-) - E59-16 (SL4-) Always Below 1 Ω
      E47-5 (SL5+) - E59-3 (SL5+) Always Below 1 Ω
      E47-6 (SL5-) - E59-10 (SL5-) Always Below 1 Ω
      E47-23 (SL1+) or E59-6 (SL1+) - Body ground Always 10 kΩ or higher
      E47-24 (SL1-) or E59-5 (SL1-) - Body ground Always 10 kΩ or higher
      E47-28 (SL2+) or E59-4 (SL2+) - Body ground Always 10 kΩ or higher
      E47-29 (SL2-) or E59-14 (SL2-) - Body ground Always 10 kΩ or higher
      E47-25 (SL3+) or E59-26 (SL3+) - Body ground Always 10 kΩ or higher
      E47-26 (SL3-) or E59-25 (SL3-) - Body ground Always 10 kΩ or higher
      E47-15 (SL4+) or E59-17 (SL4+) - Body ground Always 10 kΩ or higher
      E47-16 (SL4-) or E59-16 (SL4-) - Body ground Always 10 kΩ. or higher
      E47-5 (SL5+) or E59-3 (SL5+) - Body ground Always 10 kΩ or higher
      E47-6 (SL5-) or E59-10 (SL5-) - Body ground Always 10 kΩ or higher

    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 according to the value (s) in the table below

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      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 battery positive (+) lead with a 21 W bulb to terminal 2 and a 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 an operating sound. 

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

    NG: REPLACE SHIFT SOLENOID VALVE  (See DISASSEMBLY  )

    OK: REPAIR OR REPLACE TRANSMISSION WIRE  (See REMOVAL  )

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