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Home >> Lexus >> 2011 >> GX 460 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P1604-P2610) & Circuit Tests)) >> SFI System >> Circuit Tests >> VC Output Circuit >> Procedure

VC Output Circuit: Procedure

  1. CHECK MIL 
    1. Check that the Malfunction Indicator Lamp (MIL) lights up when the engine switch is turned on (IG).

      OK

      MIL lights up.

    NG → See step   2 

    OK → See step   17 

  2. CHECK COMMUNICATION BETWEEN TECHSTREAM AND ECM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Check the communication between the Techstream and ECM.
      RESULT

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

    A → See step   18 

    B: Go to next step 

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

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A → See step   19 

    B: Go to next step 

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

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A → See step   20 

    B: Go to next step 

  5. CHECK MIL (CANISTER PUMP MODULE) 
    1. Disconnect the canister pump module connector.
      Fig 1: Identifying Canister Pump Module Connector
      GTY223561Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the engine switch on (IG).
    3. Check the MIL.
      RESULT

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A → See step   21 

    B: Go to next step 

  6. CHECK MIL (AIR SWITCHING VALVE ASSEMBLY FOR BANK 1) 
    1. Disconnect the air switching valve connector.
    2. Turn the engine switch on (IG).
    3. Check the MIL.
      RESULT

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A → See step   23 

    B: Go to next step 

  7. CHECK MIL (AIR SWITCHING VALVE ASSEMBLY FOR BANK 2) 
    1. Disconnect the air switching valve connector.
    2. Turn the engine switch on (IG).
    3. Check the MIL.
      RESULT

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A → See step   24 

    B: Go to next step 

  8. CHECK MIL (POWER STEERING OIL PRESSURE SWITCH) 
    1. Disconnect the power steering oil pressure switch connector.
    2. Turn the engine switch on (IG).
    3. Check the MIL.
      RESULT

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A → See step   25 

    B: Go to next step 

  9. CHECK MIL (CAMSHAFT POSITION SENSOR) 
    1. Disconnect the camshaft position sensor connector.
    2. Turn the engine switch on (IG).
    3. Check the MIL.
      RESULT

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A → See step   26 

    B: Go to next step 

  10. CHECK MIL (CRANKSHAFT POSITION SENSOR) 
    1. Disconnect the crankshaft position sensor connector.
    2. Turn the engine switch on (IG).
    3. Check the MIL.
      RESULT

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A → See step   27 

    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 engine switch on (IG).
    3. Check the MIL.
      RESULT

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A → See step   28 

    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 engine switch on (IG).
    3. Check the MIL.
      RESULT

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A → See step   29 

    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 engine switch on (IG).
    3. Check the MIL.
      RESULT

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A → See step   30 

    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 engine switch on (IG).
    3. Check the MIL.
      RESULT

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A → See step   31 

    B: Go to next step 

  15. CHECK MIL (MANIFOLD ABSOLUTE PRESSURE SENSOR) 
    1. Disconnect the manifold absolute pressure sensor connector.
    2. Turn the engine switch on (IG).
    3. Check the MIL.
      RESULT

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A → See step   32 

    B: Go to next step 

  16. 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 (for Bank 1).
    5. Disconnect the air switching valve connector (for Bank 2).
    6. Disconnect the power steering oil pressure switch connector.
    7. Disconnect the camshaft position sensor connector.
    8. Disconnect the crankshaft position sensor connector.
    9. Disconnect the VVT sensor (for Intake Side of Bank 1) connector.
    10. Disconnect the VVT sensor (for Exhaust Side of Bank 1) connector.
    11. Disconnect the VVT sensor (for Intake Side of Bank 2) connector.
    12. Disconnect the VVT sensor (for Exhaust Side of Bank 2) connector.
    13. Disconnect the manifold absolute pressure sensor connector.
    14. Disconnect the ECM connectors.
    15. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C30-13 (VCTA) - Body ground Always 10 kΩ or higher
      G45-4 (VCPA) - Body ground Always 10 kΩ or higher
      G45-2 (VCP2) - Body ground Always 10 kΩ or higher
      C28-16 (VCV2) - Body ground Always 10 kΩ or higher
      C28-15 (VCV1) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   22 

  17. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
  18. GO TO MIL CIRCUIT. Refer to  MIL Circuit  
  19. REPLACE THROTTLE BODY ASSEMBLY. Refer to  REMOVAL 
  20. REPLACE ACCELERATOR PEDAL POSITION SENSOR ASSEMBLY. Refer to  REMOVAL 
  21. REPLACE CANISTER. Refer to  REMOVAL 
  22. REPLACE ECM. Refer to  REMOVAL 
  23. REPLACE AIR SWITCHING VALVE ASSEMBLY. Refer to  REMOVAL 
  24. REPLACE AIR SWITCHING VALVE ASSEMBLY. Refer to  REMOVAL 
  25. REPLACE POWER STEERING OIL PRESSURE SWITCH. Refer to  REMOVAL 
  26. REPLACE CAMSHAFT POSITION SENSOR. Refer to  REMOVAL 
  27. REPLACE CRANKSHAFT POSITION SENSOR. Refer to  REMOVAL 
  28. REPLACE VVT SENSOR (FOR INTAKE SIDE OF BANK 1). Refer to  REMOVAL 
  29. REPLACE VVT SENSOR (FOR EXHAUST SIDE OF BANK 1). Refer to  REMOVAL 
  30. REPLACE VVT SENSOR (FOR INTAKE SIDE OF BANK 2). Refer to  REMOVAL 
  31. REPLACE VVT SENSOR (FOR EXHAUST SIDE OF BANK 2). Refer to  REMOVAL 
  32. REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR. Refer to  REMOVAL 
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