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Home >> Toyota >> 2019 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Automatic Transmission (U660F) - Diagnostic Codes & Circuit Tests) >> Automatic Transaxle System >> DTC P0989: Transmission Fluid Pressure Sensor / Switch "E" Circuit Low; DTC P0990: Transmission Fluid Pressure Sensor / Switch "E" Circuit High [12/2013 - 11/2016] >> Procedure

DTC P0989: Transmission Fluid Pressure Sensor / Switch "E" Circuit Low; DTC P0990: Transmission Fluid Pressure Sensor / Switch "E" Circuit High [12/2013 - 11/2016]: Procedure

WARNING: This page is about a different car, the 2016 Toyota Highlander, 2015 Toyota Highlander, and 2014 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0989 OR P0990) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / ECT / Trouble Codes.

      Powertrain > ECT > Trouble Codes 

    5. Read the DTCs using the Techstream.

      Result

      Result Proceed to
      Only DTC P0990 is output A
      Only DTC P0989 is output B
      P0989 or P0990 and other DTCs are output C

      HINT: 

      If a solenoid is stuck OFF, DTCs for several solenoids including the malfunctioning solenoid will be stored.

    Result:  2

    B 

    See step  4

    Result:  3

    C 

    GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2013 - 08/2014]  Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2014 - 11/2015]  Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2015 - 11/2016] 

    Result:  1

    A 

    See step  2

  2. CHECK TRANSMISSION WIRE (SHORT TO GROUND) 
    1. Remove the TCM.
      GTY450703Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Transmission Wire)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      19 (TPS3) - Body ground (Valve body assembly) and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE TCM. Refer to  COMPONENTS [12/2013 - 11/2016] 

    Result:  2

    NG 

    See step  3

  3. CHECK ATF TEMPERATURE SENSOR ASSEMBLY (ATF PRESSURE SWITCH NO. 3) 
    1. Remove the oil strainer assembly.
    2. Disconnect the connector from the ATF temperature sensor assembly.
      GTY111440Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (TPS3) - Body ground (Valve body assembly) and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE TRANSMISSION WIRE. Refer to  COMPONENTS [12/2013 - 11/2016] 

    Result:  2

    NG 

    REPLACE ATF TEMPERATURE SENSOR ASSEMBLY. Refer to  COMPONENTS [12/2013 - 11/2016] 

  4. CHECK TRANSMISSION WIRE 
    1. Remove the oil strainer assembly.
    2. Remove the TCM.
      GTY440066Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Transmission Wire))
      *b TCM Side
      *c ATF Temperature Sensor Side
    3. Disconnect the connector from the ATF temperature sensor assembly.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      19 (TPS3) TCM side - 1 (TPS3) sensor side Always Below 1 Ω
      1 (TPS3) sensor side - Body ground (Valve body assembly) and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPLACE TRANSMISSION WIRE. Refer to  COMPONENTS [12/2013 - 11/2016] 

    Result:  1

    OK 

    See step  5

  5. REPLACE ATF TEMPERATURE SENSOR ASSEMBLY 

    Refer to COMPONENTS [12/2013 - 11/2016]

    Result

    Proceed to
    NEXT

    Result:  1

    NEXT 

    See step  6

  6. CHECK IF DTC OUTPUT RECURS 
    1. Connect the Techstream to the DLC3.
    2. Start the engine and turn the Techstream on.
    3. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [12/2013 - 11/2016]

      Powertrain > ECT > Clear DTCs 

      HINT: 

      Write down the currently output DTCs before clearing them.

    4. Perform the monitor drive pattern.

      Refer to MONITOR DRIVE PATTERN [12/2013 - 11/2016]

    5. Enter the following menus: Powertrain / ECT / Trouble Codes.

      Powertrain > ECT > Trouble Codes 

    6. Read the DTCs using the Techstream.

      Result

      Result Proceed to
      Only DTC P0989 is output A
      DTCs are not output B

    Result:  1

    A 

    REPLACE TCM. Refer to  COMPONENTS [12/2013 - 11/2016] 

    Result:  2

    B 

    END 

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