Click here

SFI SYSTEM(w/o Canister Pump Module) VC Output Circuit

Click here
Click here Click here
DTC Code DTC Name
  VC Output Circuit
Click here

DESCRIPTION

The ECM constantly generates 5 V power source voltage from the battery voltages supplied to the +B, +B2 (BATT) terminal to operate the microprocessor. The ECM also provides this power to the sensors through the VC output circuit.

When the VC circuit has a short circuit, the microprocessor in the ECM and sensors that are supplied power through the VC circuit are deactivated because power is not supplied from the VC circuit. When the system is in this condition, it will not start.

B00652EE03
B0067V4E03
Click here

WIRING DIAGRAM

Click here

CAUTION / NOTICE / HINT

Note:

Inspect the fuses for circuits related to this system before performing the following procedure.

Click here

PROCEDURE


  1. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Tip:

      It can be checked using the "Engine" item of the Data List.

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

  2. *1 No. 2 Engine Room Relay Block and No. 2 Junction Block Assembly *2 EFI NO. 2 Fuse
    Click here

    CHECK EFI NO. 2 FUSE VOLTAGE


    1. Turn the engine switch on (IG).

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      1 (EFI NO. 2 fuse) - Body ground Engine switch on (IG) 11 to 14 V
      Tip:

      • Check the fuse with it installed to the No. 2 engine room relay block and No. 2 junction block assembly.

      • If the result is not as specified, since current is not flowing to the +B and +B2 terminals of the ECM, the system may not be started.

      Result
      Proceed to
      OK
      NG

  3. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (THROTTLE POSITION SENSOR)


    1. Disconnect the throttle body with motor assembly connector.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Tip:

      It can be checked using the "Engine" item of the Data List.

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

      Perform "Inspection After Repair" after replacing the throttle body with motor assembly.

      Click here


  4. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (ACCELERATOR PEDAL SENSOR)


    1. Disconnect the accelerator pedal sensor assembly connector.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Tip:

      It can be checked using the "Engine" item of the Data List.

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

  5. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (MASS AIR FLOW METER SUB-ASSEMBLY)


    1. Disconnect the mass air flow meter sub-assembly connector.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Tip:

      It can be checked using the "Engine" item of the Data List.

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

      Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

      Click here


  6. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (FUEL PRESSURE SENSOR)


    1. Disconnect the fuel pressure sensor connector.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Tip:

      It can be checked using the "Engine" item of the Data List.

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

  7. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (VVT SENSOR (FOR INTAKE CAMSHAFT OF BANK 1))


    1. Disconnect the VVT sensor (for intake camshaft of bank 1) connector.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Tip:

      It can be checked using the "Engine" item of the Data List.

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

  8. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (VVT SENSOR (FOR INTAKE CAMSHAFT OF BANK 2))


    1. Disconnect the VVT sensor (for intake camshaft of bank 2) connector.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Tip:

      It can be checked using the "Engine" item of the Data List.

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

  9. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (VVT SENSOR (FOR EXHAUST CAMSHAFT OF BANK 1))


    1. Disconnect the VVT sensor (for exhaust camshaft of bank 1) connector.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Tip:

      It can be checked using the "Engine" item of the Data List.

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

  10. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (VVT SENSOR (FOR EXHAUST CAMSHAFT OF BANK 2))


    1. Disconnect the VVT sensor (for exhaust camshaft of bank 2) connector.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Tip:

      It can be checked using the "Engine" item of the Data List.

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

  11. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (CAMSHAFT POSITION SENSOR)


    1. Disconnect the camshaft position sensor connector.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Tip:

      It can be checked using the "Engine" item of the Data List.

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

  12. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (CRANKSHAFT POSITION SENSOR)


    1. Disconnect the crankshaft position sensor connector.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Tip:

      It can be checked using the "Engine" item of the Data List.

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

  13. Click here

    CHECK HARNESS AND CONNECTOR


    1. Disconnect the throttle body with motor assembly connector.

    2. Disconnect the accelerator pedal sensor assembly connector.

    3. Disconnect the mass air flow meter sub-assembly connector.

    4. Disconnect the fuel pressure sensor connector.

    5. Disconnect the VVT sensor for intake camshaft of bank 1 connector.

    6. Disconnect the VVT sensor for intake camshaft of bank 2 connector.

    7. Disconnect the VVT sensor for exhaust camshaft of bank 1 connector.

    8. Disconnect the VVT sensor for exhaust camshaft of bank 2 connector.

    9. Disconnect the camshaft position sensor connector.

    10. Disconnect the crankshaft position sensor connector.

    11. Disconnect the ECM connectors.

    12. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      F2-26 (VC) - Body ground Always 10 kΩ or higher
      F2-34 (VCTA) - Body ground Always 10 kΩ or higher
      A77-20 (VCPA) - Body ground Always 10 kΩ or higher
      A77-22 (VCP2) - Body ground Always 10 kΩ or higher
      F1-21 (VCVG) - Body ground Always 10 kΩ or higher
      F7-28 (VCPR) - Body ground Always 10 kΩ or higher
      1 (EFI NO. 2 fuse) - A77-7 (+B) Always Below 1 Ω
      1 (EFI NO. 2 fuse) - A77-6 (+B2) Always Below 1 Ω
      A77-7 (+B) - Body ground Always 10 kΩ or higher
      A77-6 (+B2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE ECMClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR