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Inspection Procedure

NOTE:
  • When a vehicle is brought into the workshop, leave it as it is. Do not change the vehicle condition. For example, do not tighten the fuel tank cap.
  • Do not disassemble the pump module.
  • The intelligent tester is required to conduct the following diagnostic troubleshooting procedure.
  1. CONFIRM DTC AND EVAP PRESSURE 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch to the ON position (do not start the engine).
    3. Turn the tester on.
    4. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
    5. Read the DTCs.
    6. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / VAPOR PRESSURE.
    7. Read the EVAP (Evaporative Emission) pressure displayed on the tester.

      Result 

      RESULT CHART

      Display (DTC Output) Test Result Suspected Trouble Area Proceed to
      P0451 - Pressure sensor C
      P0452 Less than 45 kpa (338 mmHg)
      • Wire harness/connector (ECM - pressure sensor)
      • Pressure sensor
      • Short in ECM circuit
      		 A
      P0453 More than 120 kPa (900 mmHg)
      • Wire harness/connector (ECM - pressure sensor)
      • Pressure sensor
      • Open in ECM circuit
      		 B

    B: Go to step  4

    C:  GO TO EVAP SYSTEM 

    A: Go to Next Step 

  2. CHECK HARNESS AND CONNECTOR (PUMP MODULE - ECM) 
    1. Turn the ignition switch off.
    2. Disconnect the E5 ECM connector.
    3. Measure the resistance between the PPMP terminal of the ECM connector and body ground.
      Fig 1: Identifying PPMP Terminal Of ECM Connector
      G05268124Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result 

      RESULT CHART

      Test Result Suspected Trouble Area Proceed to
      10 Ω or less
      • Wire harness/connector (ECM - pressure sensor)
      • Short in pressure sensor circuit
      		 A
      10 Ω or more
      • Wire harness/connector (ECM - pressure sensor)
      • Short in ECM circuit
      		 B
    4. Reconnect the ECM connector.

    B: Go to step  8

    A: Go to Next Step 

  3. CHECK HARNESS AND CONNECTOR (PUMP MODULE - ECM) 
    1. Disconnect the L5 canister connector.
    2. Disconnect the E5 ECM connector.
    3. Measure the resistance between the PPMP terminal of the ECM connector and body ground.
      Fig 2: Identifying PPMP Terminal Of ECM Connector
      G05268125Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result 

      RESULT CHART

      Test Result Suspected Trouble Area Proceed to
      10 kΩ or more Short in pressure sensor circuit A
      10 kΩ or less Short in wire harness/connector (ECM - pressure sensor) B
    4. Reconnect the canister connector.
    5. Reconnect the ECM connector.

    B: Go to step  6

    A: Go to Next Step 

  4. REPLACE CHARCOAL CANISTER ASSEMBLY 
    1. Replace the charcoal canister assembly (See REMOVAL ).
    2. Connect the intelligent tester to the DLC3.
    3. Turn the ignition switch to the ON position and turn the tester on.
    4. Wait for at least 60 seconds.
    5. Select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.

      HINT:

      If no pending DTC is displayed on the tester, the repair has been successfully completed.

    NEXT: COMPLETED 

  5. CHECK HARNESS AND CONNECTOR (PUMP MODULE - ECM) 
    1. Disconnect the L5 canister connector.
    2. Turn the ignition switch to the ON position.
    3. Measure the voltage and resistance of the L5 canister connector.

      Standard 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      L5-4 - Body ground Between 4.5 V and 5.5 V
      L5-3 - Body ground Between 4.5 V and 5.5 V
      L5-2 - Body ground 100 Ω or less
      Fig 3: Identifying Canister Connector
      G05268126Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result 

      RESULT CHART

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

    B: Go to step  7

    A: Go to Next Step 

  6. REPLACE CHARCOAL CANISTER ASSEMBLY 
    1. Replace the charcoal canister assembly (See REMOVAL ).
    2. Connect the intelligent tester to the DLC3.
    3. Turn the ignition switch to the ON position and turn the tester on.
    4. Wait for at least 60 seconds.
    5. Select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.

      HINT:

      If no pending DTC is displayed on the tester, the repair has been successfully completed.

    NEXT: COMPLETED 

  7. REPAIR OR REPLACE WIRE HARNESS OR CONNECTORS 
    1. Repair or replace the wire harness or connectors.
    2. Connect the intelligent tester to the DLC3.
    3. Turn the ignition switch to the ON position and turn the tester on.
    4. Wait for at least 60 seconds.
    5. Select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.

      HINT:

      If no pending DTC is displayed on the tester, the repair has been successfully completed.

    NEXT: COMPLETED 

  8. REPLACE ECM 
    1. Replace the ECM (See REMOVAL  ).
    2. Connect the intelligent tester to the DLC3.
    3. Turn the ignition switch to the ON position and turn the tester on.
    4. Wait for at least 60 seconds.
    5. Select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.

      HINT:

      If no pending DTC is displayed on the tester, the repair has been successfully completed.

    NEXT: COMPLETED 

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