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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 50 (Engine Control System (A25A-FXS) - Diagnostic Codes (P0400-P0450)) >> SFI System >> DTC P0450-11: Evaporative Emission System Pressure Sensor/Switch Circuit Short to Ground; DTC P0450-15: Evaporative Emission System Pressure Sensor/Switch Circuit Short to Battery or Open; DTC P0450-2F: Evaporative Emission System Pressure Sensor/Switch Signal Erratic [11/2023 - ] >> Procedure

DTC P0450-11: Evaporative Emission System Pressure Sensor/Switch Circuit Short to Ground; DTC P0450-15: Evaporative Emission System Pressure Sensor/Switch Circuit Short to Battery or Open; DTC P0450-2F: Evaporative Emission System Pressure Sensor/Switch Signal Erratic [11/2023 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CONFIRM DTC AND EVAP PRESSURE 
    1. Read the DTCs.

      Powertrain > Engine > Trouble Codes 

    2. Read the EVAP (Evaporative Emission) pressure displayed on the GTS.

      Powertrain > Engine > Data List 

      Tester Display
      Vapor Pressure Pump

      Result

      Display (DTC Output) Test Result Suspected Trouble Area Proceed to
      P0450-11 Less than 42.110 kPa (abs) [6.106 psi (abs)]
      • Wire harness/connector (canister pressure sensor - ECM)
      • Canister pressure sensor
      • Short in ECM circuit
      		 A
      P0450-15 Higher than 123.761 kPa (abs) [17.945 psi (abs)]
      • Wire harness/connector (canister pressure sensor - ECM)
      • Canister pressure sensor
      • Open in ECM circuit
      		 B
      P0450-2F - Canister pressure sensor C

    Result: 

    B 

    See step  5

    Result: 

    C 

    See step  6

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) 
    1. Disconnect the ECM connector.
    2. Measure the resistance according to the value(s) in the table below.

      Result

      Tester Connection Condition Specified Condition Suspected Trouble Area Proceed to
      A27-50 (PPMP) - Body ground Always Below 10 Ω
      • Wire harness/connector (canister pressure sensor - ECM)
      • Short in canister pressure sensor circuit
      		 A
      10 kΩ or higher
      • Wire harness/connector (canister pressure sensor - ECM)
      • Short in ECM circuit
      		 B

    Result: 

    B 

    See step  4

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) 
    1. Disconnect the canister pump module connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Result

      Tester Connection Condition Specified Condition Suspected Trouble Area Proceed to
      A27-50 (PPMP) - Body ground Always 10 kΩ or higher Short in canister pressure sensor circuit A
      Below 10 Ω Short in wire harness/connector (canister pressure sensor - ECM) B

    Result: 

    A 

    See step  6

    Result: 

    B 

    See step  7

  4. REPLACE ECM 

    Refer to REMOVAL [11/2023 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  8

  5. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) 
    1. Disconnect the canister pump module connector.
      GTY855314Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Canister Pump Module)      		 - -
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Q1-8 (SGND) - Body ground Always 100 Ω or less
    3. Turn the ignition switch to ON.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      Q1-6 (VCC) - Body ground Ignition switch ON 4.5 to 5.5 V
      Q1-7 (VOUT) - Body ground Ignition switch ON 4.5 to 5.5 V

      Result

      Test Result Suspected Trouble Area Proceed to
      Voltage and resistance within standard ranges Open in canister pressure sensor circuit A
      Voltage and/or resistance outside standard ranges Open in wire harness/connector (canister pressure sensor - ECM) B

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  6

  6. REPLACE CANISTER PUMP MODULE 

    Refer to REMOVAL [12/2019 - ]

    NOTE:
    • When replacing the canister pump module, check the inside of the canister pump module and canister, and related pipes for water, fuel and other liquids. If liquids are present, check for disconnections and/or cracks in the following: 1) the pipe from the air inlet port to the canister pump module; 2) the canister filter; and 3) the fuel tank vent hose. If liquids are present in the inside of the canister, replace the canister and canister pump module.
    • Check for filter blockage in the canister. If the charcoal filter inside the canister is clogged, replace the canister and canister pump module.
    • Check for filter blockage in the canister filter. If there is blockage in the canister filter, replace the canister filter.
    GTY928942Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *1 Fuel Tank Vent Hose *2 Air Inlet Port
    *3 Vent Hose *4 Fuel Tank
    *5 Canister Pump Module
    • Canister Pressure Sensor
    • Leak Detection Pump
    • Vent Valve
    		 *6 Canister
    *7 Canister Filter *8 Fuel Tank Pressure Sensor
    *9 Fuel Tank Cap Assembly *10 Fuel Vapor-containment Valve
    *a Inspection Area
    (Check for disconnection and/or cracks)    		 - -

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  8

  7. REPAIR OR REPLACE HARNESS OR CONNECTOR (CANISTER PUMP MODULE - ECM) 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  8

  8. CLEAR DTC 
    1. Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

    2. Turn the ignition switch off and wait for at least 30 seconds.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  9

  9. CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR) 
    1. Perform the Evaporative System Check using the GTS, referring to the Confirmation Driving Pattern.
    2. Check the DTC judgment result.

      Powertrain > Engine > Utility 

      Tester Display
      All Readiness

      Result

      GTS Display Description
      NORMAL
      • DTC judgment completed
      • System normal
      ABNORMAL
      • DTC judgment completed
      • System abnormal
      INCOMPLETE
      • DTC judgment not completed
      • Perform driving pattern after confirming DTC enabling conditions
    3. Input the DTC: P0450-11, P0450-15 or P0450-2F.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    END 

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