2009 Toyota Avalon LimitedFACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. CHECK VACUUM HOSES 
    1. If the hose is damaged, replace the vacuum hose assembly.
    2. Check the air and vacuum hoses for looseness, disconnection and blockage.

      NG: REPAIR OR REPLACE VACUUM HOSES 

      Fig 1: Checking Vacuum Hoses
      G04973753Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to next step 

  2. CHECK VACUUM 
    1. Start the engine.
    2. Disconnect the vacuum hose from the air cleaner cap.
    3. Check that the disconnected port located on the vacuum tank applies suction to your finger.

      OK: 

      Vacuum pressure exists. 

    4. Reconnect the vacuum hose.

      NG: CHECK AND REPLACE VACUUM SOURCE AND HOSES 

      Fig 2: Identifying Vacuum Hose
      G04973754Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to next step 

  3. INSPECT DUTY VACUUM SWITCHING VALVE (OPERATION) 
    1. Remove the VSV for ACM.
    2. Check operation of the VSV for ACM when positive battery voltage is applied to the terminals of the VSV for the ACM connector.

      Positive battery voltage is not applied: 

      The air from pipe G is flowing out through pipes E and H. 

      Positive battery voltage is applied: 

      The air from pipe F is flowing out through pipes E and H. 

    3. Reinstall the VSV for ACM.

      NG: REPLACE DUTY VACUUM SWITCHING VALVE 

      Fig 3: Checking Vacuum Switching Valve Operation
      G04973755Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to next step 

  4. INSPECT DUTY VACUUM SWITCHING VALVE (RESISTANCE) 
    1. Disconnect the VSV for ACM connector.
    2. Measure the resistance between terminals 1 and 2.

      Standard resistance: 

      19 to 21 Ω at 20°C (68°F) 

    3. Reconnect the VSV for ACM connector.

      NG: REPLACE DUTY VACUUM SWITCHING VALVE 

      Fig 4: Identifying B15 VSV For ACM Connector Terminals
      G05404702Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to next step 

  5. INSPECT ENGINE MOUNTING INSULATOR ASSEMBLY FRONT 
    1. Disconnect the vacuum hose from the front engine mount insulator.
    2. Using a vacuum pump, apply vacuum of 80 kPa (600 mmHg, 25 in.Hg) and wait for 1 minute.
    3. Check that there is no change in the needle movement of the vacuum pump gauge.
    4. Check that there is no fluid leakage caused by a break in the diaphragm.

      OK: 

      Vacuum pressure exists. 

    5. Reconnect the vacuum hose.
      Fig 5: Checking Engine Mounting Insulator Assembly
      G04973757Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPLACE FRONT ENGINE MOUNTING INSULATOR ASSEMBLY 

      OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (VSV FOR ACM - ECM) 
    1. Check the wire harness between the VSV for ACM connector and the ECM connector.
      1. Disconnect the VSV for ACM connector.
      2. Disconnect the ECM connector.
      3. Measure the resistance between the wire harness side connectors.

        Standard resistance (Check for open) 

        RESISTANCE SPECIFIED CONDITIONS

        Tester Connections Specified Conditions
        VSV for ACM (B15-2) - ACM (B50-42) Below 1 Ω

        Standard resistance (Check for open) 

        RESISTANCE SPECIFIED CONDITIONS

        Tester Connections Specified Conditions
        VSV for ACM (B15-2) or ACM (B50-42) - Body ground 10 kΩ or higher
      4. Reconnect the ECM connector.
      5. Reconnect the VSV connector.

        NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

        Fig 6: Identifying B15 VSV For ACM And B50 ECM Connector Terminals
        G05404704Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        OK: Go to next step 

  7. INSPECT DUTY VACUUM SWITCHING VALVE (VOLTAGE) 
    1. Disconnect the VSV for ACM connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage between the terminals.

      Standard voltage 

      VOLTAGE SPECIFIED CONDITION

      Tester Connection Specified Condition
      B15-1 - Body ground 9 to 14 V

      NG: Go to step 8 

      Fig 7: Identifying B15 VSV For ACM Connector Terminals
      G05404705Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: REPLACE ECM (See  REMOVAL   ) 

  8. CHECK HARNESS AND CONNECTOR (VSV FOR ACM - ENGINE JUNCTION BLOCK (EFI RELAY)) 
    1. Check the wire harness between the VSV for ACM and the EFI relay.
      1. Disconnect the VSV for ACM connector.
      2. Remove the engine room junction block.
      3. Measure the resistance between the wire harness side connectors.

        Standard resistance (Check for open) 

        RESISTANCE SPECIFIED CONDITIONS

        Tester Connections Specified Condition
        VSV for ACM (B15-1) - 1D-5 (Engine room relay block) Below 1 Ω

        Standard resistance (Check for short) 

        RESISTANCE SPECIFIED CONDITIONS

        Tester Connections Specified Condition
        VSV for ACM (B15-1) or 1D-5 (Engine room relay block) - Body ground 10 kΩ or higher
      4. Reconnect the VSV for ACM connector.
      5. Reinstall the engine room junction block.

        NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

        Fig 8: Identifying Engine Room Junction Block And VSV For ACM Connector
        G05404706Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        OK: OK REPLACE ECM (See  REMOVAL   ) 

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.