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Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle >> Automatic Transmission System >> DTC P0873 Transmission Fluid Pressure Sensor / Switch "C" Circuit High >> Inspection Procedure

Inspection Procedure

  1. CHECK DTC OUTPUT (IN ADDITION TO DTC P0746 AND P0873) 
    1. Connect the intelligent tester or Techstream to the DLC3.
    2. Turn the engine switch on (IG) and push the tester main switch ON.
    3. Enter the following menus:
      1. Intelligent tester - Select: DIAGNOSIS / OBD/MOBD / ECT / DTC INFO / CURRENT CODES.
      2. Techstream - Select: Powertrain / ECT / Trouble Codes.
    4. Read the DTCs using the tester.

      Result 

      RESULT CHART

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

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

    A: GO TO NEXT STEP 

  2. CHECK OIL PRESSURE SWITCH CIRCUIT 
    Fig 1: Checking Oil Pressure Switch Circuit
    G04948344Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      E6-25 (TPS1) - Body ground Always 10 kΩ or higher

      HINT:

      Do not disconnect the connectors of the TCM.

    NG: Go to step   6 

    OK: GO TO NEXT STEP 

  3. INSPECT SHIFT SOLENOID VALVE SL1 
    Fig 2: Checking Shift Solenoid Valve SL1
    G04948326Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the shift solenoid valve SL1 (see DISASSEMBLY  ).
    2. Measure the resistance of the shift solenoid valve.

      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
    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 noise.

      OK : 

      Valve moves and makes operating noise. 

    NG: REPLACE SHIFT SOLENOID VALVE SL1 (See  DISASSEMBLY   ) 

    OK: GO TO NEXT STEP 

  4. INSPECT TRANSMISSION VALVE BODY ASSEMBLY 
    1. Check the transmission valve body assembly (see REMOVAL  ).

      OK : 

      There are no foreign objects on each valve. 

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

    OK: GO TO NEXT STEP 

  5. INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY 
    1. Check the torque converter clutch assembly (see TORQUE CONVERTER AND DRIVE PLATE  ).

      OK : 

      The torque converter clutch operates normally. 

    NG: REPLACE TORQUE CONVERTER CLUTCH ASSEMBLY (See  REMOVAL   ) 

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

  6. READ VALUE OF DATA LIST (TPS 1 SW SIGNAL) 
    Fig 3: Checking Value Of Data List (TPS 1 SW Signal)
    G04948341Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Connect terminals TPS1 and E1 of the E5 and E6 TCM connectors.

      HINT:

      Before checking, do visual and contact pressure checks on the TCM connector.

    2. Connect the intelligent tester or Techstream to the DLC3.
    3. Turn the engine switch on (IG) and push the tester main switch ON.
    4. Enter the following menus:
      1. Intelligent tester - Select: DIAGNOSIS / OBD/MOBD / ECT / DATA LIST.
      2. Techstream - Select: Powertrain / ECT / Data List.
    5. Read the value displayed on the tester.

      Result 

      Intelligent tester 

      RESULT CHART

      Tester Display Proceed to
      TPS 1 SW OFF A
      TPS 1 SW ON B

      Techstream 

      TESTER DISPLAY REFERENCE

      Tester Display Proceed to
      TPS 1 Switch OFF A
      TPS 1 Switch ON B

    B: Go to step   8 

    A: GO TO NEXT STEP 

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

    NEXT 

    PERFORM AT REGISTRATION (See  REGISTRATION   ) 

  8. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - TCM) 
    Fig 4: Checking Harness And Connector (Transmission Wire - TCM)
    G04948342Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E50 transmission wire connector.
    2. Disconnect the E6 TCM connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      E50-17 (TPS1) - E6-25 (TPS1) Always Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP 

  9. INSPECT TRANSMISSION WIRE (OIL PRESSURE SWITCH) 
    Fig 5: Checking Transmission Wire (Oil Pressure Switch)
    G04948343Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the oil pressure switch connector.
    2. Disconnect the E50 transmission wire connector.
    3. Measure the resistance of the transmission wire.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      Oil pressure switch connector -17 (TPS1) Always Below 1Ω
      Oil pressure switch connector or 17 (TPS1) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE TRANSMISSION WIRE (See  REMOVAL   ) 

    OK: REPLACE OIL PRESSURE SWITCH (See  DISASSEMBLY   ) 

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