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Home >> Toyota >> 2007 >> Avalon Limited >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - System And Circuit Testing, On-Vehicle Inspection, Removal, Inspection And Installation >> VC Output Circuit >> Inspection Procedure
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Inspection Procedure

  1. CHECK MIL 
    1. Check that the Malfunction Indicator Lamp (MIL) lights up when turning the ignition switch on (IG).

      OK: 

      MIL lights up 

    OK: SYSTEM OK 

    NG: Go to Next Step 

  2. CHECK COMMUNICATION BETWEEN INTELLIGENT TESTER AND ECM 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch on (IG) and turn the tester on.
    3. Check the communication between the tester and ECM.

      Result 

    RESULT CHART

    Result Proceed to
    Communication is possible A
    Communication is not possible B

    A: GO TO  MIL CIRCUIT  

    B: Go to Next Step 

  3. CHECK MIL (THROTTLE POSITION SENSOR) 
    1. Disconnect the throttle body connector.
    2. Turn the ignition switch on (IG).
    3. Check the MIL

      Result 

      RESULT CHART

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B
    4. Reconnect the throttle body connector.

    A: REPLACE THROTTLE BODY ASSEMBLY 

    B: Go to Next Step 

  4. CHECK MIL (ACCELERATOR PEDAL POSITION SENSOR) 
    1. Disconnect the accelerator pedal position sensor connector.
    2. Turn the ignition switch on (IG).
    3. Check the MIL.

      Result 

      RESULT CHART

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B
    4. Reconnect the accelerator pedal position sensor connector.

    A: REPLACE ACCELERATOR PEDAL POSITION SENSOR 

    B: Go to Next Step 

  5. CHECK MIL (CANISTER PUMP MODULE) 
    1. Disconnect the canister pump module connector.
    2. Turn the ignition switch on (IG).
    3. Check the MIL
      Fig 1: Locating Canister Pump Module Connector
      G04996506Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Result 

      RESULT CHART

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B
    4. Reconnect the canister pump module connector.

    A: REPLACE CHARCOAL CANISTER ASSEMBLY 

    B: Go to Next Step 

  6. CHECK MIL (VVT SENSOR FOR BANK 1 INTAKE SIDE) 
    1. Disconnect the VVT sensor connector.
    2. Turn the ignition switch on (IG).
    3. Check the MIL.

      Result 

      RESULT CHART

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B
    4. Reconnect the VVT sensor connector.

    A: REPLACE VVT SENSOR (FOR BANK 1 INTAKE SIDE) 

    B: Go to Next Step 

  7. CHECK MIL (VVT SENSOR FOR BANK 2 INTAKE SIDE) 
    1. Disconnect the VVT sensor connector.
    2. Turn the ignition switch on (IG).
    3. Check the MIL.

      Result 

      RESULT CHART

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B
    4. Reconnect the VVT sensor connector.

    A: REPLACE VVT SENSOR (FOR BANK 2 INTAKE SIDE) 

    B: Go to Next Step 

  8. CHECK MIL (VVT SENSOR FOR BANK 1 EXHAUST SIDE) 
    1. Disconnect the VVT sensor connector.
    2. Turn the ignition switch on (IG).
    3. Check the MIL

      Result 

      RESULT CHART

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B
    4. Reconnect the VVT sensor connector.

    A: REPLACE VVT SENSOR (FOR BANK 1 EXHAUST SIDE) 

    B: Go to Next Step 

  9. CHECK MIL (VVT SENSOR FOR BANK 2 EXHAUST SIDE) 
    1. Disconnect the VVT sensor connector.
    2. Turn the ignition switch on (IG).
    3. Check the MIL.

      Result 

      RESULT CHART

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B
    4. Reconnect the VVT sensor connector.

    A: REPLACE VVT SENSOR (FOR BANK 2 EXHAUST SIDE) 

    B: Go to Next Step 

  10. CHECK WIRE HARNESS 
    1. Disconnect the throttle body connector.
    2. Disconnect the accelerator pedal position sensor connector.
    3. Disconnect the canister pump module connector.
    4. Disconnect the VVT sensor connectors.
    5. Disconnect the ECM connectors.
    6. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      B45-23 (VC) - Body ground 10 kΩ or higher
      A24-26 (VCPA) - Body ground 10 kΩ or higher
      A24-27 (VCP2) - Body ground 10 kΩ or higher
    7. Reconnect the throttle body connector.
    8. Reconnect the accelerator pedal position sensor connector.
    9. Reconnect the canister pump module connector.
    10. Reconnect the VVT sensor connectors.
    11. Reconnect the ECM connectors.
    Fig 2: Identifying ECM Connector Terminals
    G04996507Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ECM 

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