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Home >> Lexus >> 2008 >> IS 250 RWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 22 (Automatic Transaxle) >> Automatic Transmission System >> DTC P0873: Transmission Fluid Pressure Sensor / Switch "C" Circuit High >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC OUTPUT (IN ADDITION TO DTC P0746 AND P0873) 
    1. Connect the Techstream to the DLC3
    2. Turn the engine switch on (IG)
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / ECT / Trouble Codes.
    5. Read the DTCs using the Techstream

      Result 

      RESULT REFERENCE

      Display (DTC Output) Proceed to
      Only P0746 and P0873 are output A
      P0746, P0873 and other DTCs are output B

      HINT:

      If any other codes besides P0746 and P0873 are output, perform troubleshooting for those DTCs first

    B: GO TO DTC CHART  (See DIAGNOSTIC TROUBLE CODE CHART  )

    A: Go to next Step 

  2. READ VALUE USING TECHSTREAM (TPS 1 SW SIGNAL) 
    1. Connect terminals TPS1 and E1 of the TCM connectors.

      HINT:

      Before checking, perform visual and contact pressure checks on the TCM connectors.

    2. Connect the Techstream to the DLC3
    3. Turn the engine switch on (IG).
    4. Turn the Techstream on.
    5. Enter the following menus. Powertrain / ECT / Data List.
    6. Read the value displayed on the Techstream.

      Standard 

      STANDARD SPECIFICATION

      Tester Display Condition
      TPS 1 Switch ON Gear is 1st to 5th
      TPS 1 Switch OFF Gear is 6th to 8th; or shift lever is in P, N or R
      7. Fig 1: Identifying Terminal TPS1 Of TCM Connector
      G05750744Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step  4

    OK: Go to next Step 

  3. REPLACE TCM 
    1. Replace the TCM (See REMOVAL  ).

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

  4. CHECK OIL PRESSURE SWITCH CIRCUIT 
    1. Turn the engine switch off.

      HINT:

      Before checking, perform visual and contact pressure checks on the TCM connectors.

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

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      E59-9 (TPS1) - Body ground Engine switch off 10 kΩ or higher

      Result 

      RESULT REFERENCE

      Result Proceed to
      OK B
      NG A
      3. Fig 2: Identifying Terminal TPS1 Of TCM Connector
      G05750744Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    B: Go to step  7

    A: Go to next Step 

  5. CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND) 
    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
      E59-9 (TPS1) - Body ground Engine switch off 10 kΩ or higher
      3. Fig 3: Identifying Terminal TPS1 Of TCM Connector
      G05750749Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step  9

    OK: Go to next Step 

  6. REPLACE TCM 
    1. Replace the TCM (See REMOVAL  )

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

  7. INSPECT SHIFT SOLENOID VALVE SL1 
    1. Remove the shift solenoid valve SL1 (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
    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. 

      Fig 4: Inspecting Shift Solenoid Valve SL1
      G04948326Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE SHIFT SOLENOID VALVE SL1  (See DISASSEMBLY  )

    OK: Go to next Step 

  8. INSPECT TRANSMISSION VALVE BODY ASSEMBLY 
    1. Check the transmission valve body assembly (See DISASSEMBLY  ).

      OK: There are no foreign objects on any valve. 

    NG: REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY  (See REMOVAL  )

    OK: REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY  (See REMOVAL  )

  9. 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.

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      E47-17 (TPS1) - E59-9 (TPS1) Always Below 1 Ω
      E47-17 (TPS1) or E59-9 (TPS1) - Body ground Always 10 kΩ or higher
      4. Fig 5: Identifying E47 Transmission Wire And E59 TCM Connector Terminal
      G05750745Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next Step 

  10. INSPECT TRANSMISSION WIRE (OIL PRESSURE SWITCH) 
    1. Disconnect the oil pressure switch connector (See REMOVAL  )
    2. Disconnect the transmission wire connector
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      Oil pressure switch connector-17 (TPS1) Always Below 1 Ω
      Oil pressure switch connector or 17 (TPS1) - Body ground Always 10 kΩ or higher
      4. Fig 6: Identifying Transmission Wire And Oil Pressure Switch Connector Terminal
      G04948343Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE TRANSMISSION WIRE  (See REMOVAL  )

    OK: REPLACE OIL PRESSURE SWITCH  (See DISASSEMBLY  )

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