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Home >> Lexus >> 2015 >> GS 350 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnostic Codes (4 Of 4) & Circuit Tests >> SFI System >> Circuit Tests >> VC Output Circuit [09/2014 - 10/2015] >> Procedure
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VC Output Circuit [09/2014 - 10/2015]: Procedure

  1. CHECK MIL 
    1. Check that Malfunction Indicator Lamp (MIL) illuminates when turning the engine switch on (IG).

      OK

      MIL lights up.

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

    (Refer to PROBLEM SYMPTOMS TABLE [09/2014 - 10/2015] )

    Result: 

    NG 

    See step  2

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

      Result

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

    Result: 

    B 

    GO TO MIL CIRCUIT 

    (Refer to MIL Circuit [09/2014 - 10/2015] )

    Result: 

    A 

    See step  3

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

      HINT: 

      Perform "Inspection After Repair" after replacing the throttle body assembly (Refer to INITIALIZATION [09/2014 - 10/2015] ).

    Result: 

    B 

    REPLACE THROTTLE BODY ASSEMBLY 

    (Refer to REMOVAL [09/2014 - 10/2015] )

    Result: 

    A 

    See step  4

  4. CHECK MIL (ACCELERATOR PEDAL 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 does not illuminate A
      MIL illuminates B
    4. Reconnect the accelerator pedal position sensor connector.

    Result: 

    B 

    REPLACE ACCELERATOR PEDAL ASSEMBLY 

    (Refer to REMOVAL [09/2014 - 10/2015] )

    Result: 

    A 

    See step  5

  5. CHECK MIL (VVT SENSOR FOR INTAKE SIDE BANK 1) 
    1. Disconnect the VVT sensor for intake side bank 1 connector.
    2. Turn the engine switch on (IG).
    3. Check the MIL.

      Result

      Result Proceed to
      MIL does not illuminate A
      MIL illuminates B
    4. Reconnect the VVT sensor for intake side bank 1 connector.

    Result: 

    B 

    REPLACE VVT SENSOR FOR INTAKE SIDE BANK 1 

    (Refer to REMOVAL [09/2014 - 10/2015] )

    Result: 

    A 

    See step  6

  6. CHECK MIL (VVT SENSOR FOR EXHAUST SIDE BANK 1) 
    1. Disconnect the VVT sensor for exhaust side bank 1 connector.
    2. Turn the engine switch on (IG).
    3. Check the MIL.

      Result

      Result Proceed to
      MIL does not illuminate A
      MIL illuminates B
    4. Reconnect the VVT sensor for exhaust side bank 1 connector.

    Result: 

    B 

    REPLACE VVT SENSOR FOR EXHAUST SIDE BANK 1 

    (Refer to REMOVAL [09/2014 - 10/2015] )

    Result: 

    A 

    See step  7

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

      Result

      Result Proceed to
      MIL does not illuminate A
      MIL illuminates B
    4. Reconnect the VVT sensor for intake side bank 2 connector.

    Result: 

    B 

    REPLACE VVT SENSOR FOR INTAKE SIDE BANK 2 

    (Refer to REMOVAL [09/2014 - 10/2015] )

    Result: 

    A 

    See step  8

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

      Result

      Result Proceed to
      MIL does not illuminate A
      MIL illuminates B
    4. Reconnect the VVT sensor for exhaust side bank 2 connector.

    Result: 

    B 

    REPLACE VVT SENSOR FOR EXHAUST SIDE BANK 2 

    (Refer to REMOVAL [09/2014 - 10/2015] )

    Result: 

    A 

    See step  9

  9. CHECK MIL (FUEL PRESSURE SENSOR) 
    1. Disconnect the fuel pressure sensor connector.
    2. Turn the engine switch on (IG).
    3. Check the MIL.

      Result

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

    Result: 

    B 

    REPLACE FUEL DELIVERY PIPE SUB-ASSEMBLY (FUEL PRESSURE SENSOR) 

    (Refer to REMOVAL [09/2014 - 10/2015] )

    Result: 

    A 

    See step  10

  10. CHECK MIL (CANISTER PUMP MODULE) 
    1. Disconnect the canister pump module connector.
    2. Turn the engine switch on (IG).
    3. Check the MIL.

      Result

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

    Result: 

    B 

    REPLACE CANISTER PUMP MODULE 

    (Refer to REMOVAL [09/2014 - 10/2015] )

    Result: 

    A 

    See step  11

  11. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the throttle body connector.
    2. Disconnect the accelerator pedal position sensor connector.
    3. Disconnect the VVT sensor for intake side bank 1 connector.
    4. Disconnect the VVT sensor for exhaust side bank 1 connector.
    5. Disconnect the VVT sensor for intake side bank 2 connector.
    6. Disconnect the VVT sensor for exhaust side bank 2 connector.
    7. Disconnect the fuel pressure sensor connector.
    8. Disconnect the canister pump module connector.
    9. Disconnect the ECM connectors.
    10. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      F1-18 (VC) - Body ground Always 10 kΩ or higher
      F2-34 (VCTA) - Body ground Always 10 kΩ or higher
      A19-23 (VCPA) - Body ground Always 10 kΩ or higher
      A19-22 (VCP2) - Body ground Always 10 kΩ or higher
    11. Reconnect the ECM connectors.
    12. Reconnect the canister pump module connector.
    13. Reconnect the fuel pressure sensor connector.
    14. Reconnect the VVT sensor for exhaust side bank 2 connector.
    15. Reconnect the VVT sensor for intake side bank 2 connector.
    16. Reconnect the VVT sensor for exhaust side bank 1 connector.
    17. Reconnect the VVT sensor for intake side bank 1 connector.
    18. Reconnect the accelerator pedal position sensor connector.
    19. Reconnect the throttle body connector.

    Result: 

    OK 

    REPLACE ECM 

    (Refer to REMOVAL [09/2014 - 10/2015] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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