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Home >> Toyota >> 2008 >> Sequoia Platinum, RWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (3UR-FE) - Circuit Testing, Component On-Vehicle Inspection, Removal, Inspection & Installation >> VC Output Circuit >> Inspection Procedure

Inspection Procedure

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

      OK: MIL lights up 

    NG: Go to step 2 

    OK: END 

  2. CHECK COMMUNICATION BETWEEN TECHSTREAM AND ECM 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Check the communication between the Techstream and ECM.

      Result 

      RESULT REFERENCE

      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 to ON.
    3. Check the MIL.

      Result 

      RESULT REFERENCE

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A: REPLACE THROTTLE BODY ASSEMBLY  (See REMOVAL  )

    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 to ON.
    3. Check the MIL

      Result 

      RESULT REFERENCE

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A: REPLACE ACCELERATOR PEDAL POSITION SENSOR  (See REMOVAL  )

    B: Go to Next Step. 

  5. CHECK MIL (CANISTER PUMP MODULE) 
    1. Disconnect the canister pump module connector.
    2. Turn the ignition switch to ON.
    3. Check the MIL.

      Result 

      RESULT REFERENCE

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A: REPLACE CHARCOAL CANISTER ASSEMBLY  (See REMOVAL )

    Fig 1: Identifying Canister Pump Module Connector Terminals
    G05644682Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    B: Go to Next Step. 

  6. CHECK MIL (AIR SWITCHING VALVE for Bank 1) 
    1. Disconnect the air switching valve connector.
    2. Turn the ignition switch to ON.
    3. Check the MIL

      Result 

      RESULT REFERENCE

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A: REPLACE AIR SWITCHING VALVE  (See REMOVAL )

    B: Go to Next Step. 

  7. CHECK MIL (AIR SWITCHING VALVE for Bank 2) 
    1. Disconnect the air switching valve connector.
    2. Turn the ignition switch to ON.
    3. Check the MIL.

      Result 

      RESULT REFERENCE

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A: REPLACE AIR SWITCHING VALVE  (See REMOVAL )

    B: Go to Next Step. 

  8. CHECK MIL (POWER STEERING OIL PRESSURE SENSOR) 
    1. Disconnect the power steering oil pressure sensor connector.
    2. Turn the ignition switch to ON.
    3. Check the MIL

      Result 

      RESULT REFERENCE

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A: REPLACE POWER STEERING OIL PRESSURE SENSOR 

    B: Go to Next Step. 

  9. CHECK MIL (CAMSHAFT POSITION SENSOR) 
    1. Disconnect the camshaft position sensor connector.
    2. Turn the ignition switch to ON.
    3. Check the MIL.

      Result 

      RESULT REFERENCE

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A: REPLACE CAMSHAFT POSITION SENSOR  (See INSTALLATION  )

    B: Go to Next Step. 

  10. CHECK MIL (CRANKSHAFT POSITION SENSOR) 
    1. Disconnect the crankshaft position sensor connector.
    2. Turn the ignition switch to ON.
    3. Check the MIL.

      Result 

      RESULT REFERENCE

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A: REPLACE CRANKSHAFT POSITION SENSOR  (See INSTALLATION  )

    B: Go to Next Step. 

  11. CHECK MIL (VVT SENSOR for Intake Side of Bank 1) 
    1. Disconnect the VVT sensor (for Intake Side of Bank 1) connector.
    2. Turn the ignition switch to ON.
    3. Check the MIL.

      Result 

      RESULT REFERENCE

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A: REPLACE VVT SENSOR (for Intake Side of Bank 1)  (See INSTALLATION  )

    B: Go to Next Step. 

  12. CHECK MIL (VVT SENSOR for Exhaust Side of Bank 1) 
    1. Disconnect the VVT sensor (for Exhaust Side of Bank 1) connector.
    2. Turn the ignition switch to ON.
    3. Check the MIL

      Result 

      RESULT REFERENCE

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A: REPLACE VVT SENSOR (for Exhaust Side of Bank 1)  (See INSTALLATION  )

    B: Go to Next Step. 

  13. CHECK MIL (VVT SENSOR for Intake Side of Bank 2) 
    1. Disconnect the VVT sensor (for Intake Side of Bank 2) connector.
    2. Turn the ignition switch to ON.
    3. Check the MIL.

      Result 

      RESULT REFERENCE

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A: REPLACE VVT SENSOR (for Intake Side of Bank 2)  (See INSTALLATION  )

    B: Go to Next Step. 

  14. CHECK MIL (VVT SENSOR for Exhaust Side of Bank 2) 
    1. Disconnect the VVT sensor (for Exhaust Side of Bank 2) connector.
    2. Turn the ignition switch to ON.
    3. Check the MIL.

      Result 

      RESULT REFERENCE

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A: REPLACE VVT SENSOR (for Exhaust Side of Bank 2)  (See INSTALLATION  )

    B: Go to Next Step. 

  15. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the throttle body connector.
    2. Disconnect the accelerator pedal position sensor connector.
    3. Disconnect the canister pump module connector.
    4. Disconnect the air switching valve connector.
    5. Disconnect the air switching valve connector.
    6. Disconnect the power steering oil pressure sensor connector.
    7. Disconnect the camshaft position sensor connector.
    8. Disconnect the crankshaft position sensor connector. (i) Disconnect the VVT sensor (for Intake Side of Bank 1) connector.
    9. Disconnect the VVT sensor (for Exhaust Side of Bank 1) connector.
    10. Disconnect the VVT sensor (for Intake Side of Bank 2) connector.
    11. Disconnect the VVT sensor (for Exhaust Side of Bank 2) connector.
    12. Disconnect the ECM connectors.
    13. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      D56-80 (VCTA) - Body ground Always 10 kΩ or higher
      A27-57 (VCPA) - Body ground Always 10 kΩ or higher
      A27-59 (VCP2) - Body ground Always 10 kΩ or higher
      D56-66 (VCV2) - Body ground Always 10 kΩ or higher
      D56-67 (VCV1) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 2: Identifying ECM Connector Terminals
    G05644683Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE ECM  (See REMOVAL  )

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