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Home >> Lexus >> 2006 >> IS 250 RWD, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 12 (Automatic Transmission) >> Automatic Transmission System >> DTC P0973 Shift Solenoid "A" Control Circuit Low (Shift Solenoid Valve S1); DTC P0974 Shift Solenoid "A" Control Circuit High (Shift Solenoid Valve S1) >> Wiring Diagram

DTC P0973 Shift Solenoid "A" Control Circuit Low (Shift Solenoid Valve S1); DTC P0974 Shift Solenoid "A" Control Circuit High (Shift Solenoid Valve S1): Wiring Diagram

WARNING: This page is about a different car, the 2006 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Wiring Diagram - Shift Solenoid "A" Control Circuit Low (Shift Solenoid Valve S1)
G04052904Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The shift solenoid valve S1 is turned on/off normally when the shift lever is in the D position:

SHIFT LEVER POSITION

ECM command gearshift 1st 2nd 3rd 4th 5th 6th
Shift solenoid valve S1 OFF ON ON ON ON ON
  1. INSPECT TRANSMISSION WIRE (S1) 
    1. Disconnect the transmission wire connector from the transmission.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      20°C (68°F) 8 - Body ground 11 to 15 Ω
      Fig 2: Inspecting Transmission Wire (S1)
      G04052905Courtesy 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 transmission.
    2. Disconnect the connector from the ECM.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition 20°C (68°F)
      E4-19 (S1) - Body ground 11 to 15 Ω
      Fig 3: Disconnecting E4 Connector From ECM
      G04052906Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK : REPLACE ECM 

  3. INSPECT SHIFT SOLENOID VALVE S1 
    1. Remove the shift solenoid valve S1.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition 20°C (68°F)
      Solenoid Connector (S1) - Solenoid Body (S1) 11 to 15 Ω
      Fig 4: Inspecting Shift Solenoid Valve S1
      G04052907Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Connect positive (+) lead to the terminal of the solenoid connector, and the negative (-) lead to the solenoid body.

      OK: The solenoid makes an operating sound. 

    NG : REPLACE SHIFT SOLENOID VALVE S1 

    OK : REPAIR OR REPLACE TRANSMISSION WIRE 

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