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

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DTC Code DTC Name
  VC Output Circuit
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DESCRIPTION

The ECM constantly generates a 5 V power source voltage from the battery voltage supplied to the +B, +B2 (BATT) terminals 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.

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WIRING DIAGRAM


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CAUTION / NOTICE / HINT

Note:

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

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PROCEDURE


  1. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    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 Engine Room Relay Block and Junction Block Assembly *2 EFI NO. 1 Fuse
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    CHECK EFI NO. 1 FUSE VOLTAGE


    1. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      1 (EFI NO. 1 fuse) - Body ground Ignition switch ON 11 to 14 V
      Tip:

      • Check the fuse with it installed to the No. 1 engine room relay block and No. 1 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 ignition switch to ON.

    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.

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  4. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (ACCELERATOR PEDAL POSITION SENSOR)


    1. Disconnect the accelerator pedal sensor assembly connector.

    2. Turn the ignition switch to ON.

    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 (CRANKSHAFT POSITION SENSOR)


    1. Disconnect the crankshaft position sensor connector.

    2. Turn the ignition switch to ON.

    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

  6. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT))


    1. Disconnect the camshaft position sensor (for intake camshaft) connector.

    2. Turn the ignition switch to ON.

    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 (MANIFOLD ABSOLUTE PRESSURE SENSOR)


    1. Disconnect the manifold absolute pressure sensor connector.

    2. Turn the ignition switch to ON.

    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 (CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT))


    1. Disconnect the camshaft position sensor (for exhaust camshaft) connector.

    2. Turn the ignition switch to ON.

    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 (OIL PRESSURE SENSOR (OIL PRESSURE SENDER GAUGE ASSEMBLY))


    1. Disconnect the oil pressure sensor (oil pressure sender gauge assembly) connector.

    2. Turn the ignition switch to ON.

    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 (FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE))


    1. Disconnect the fuel pressure sensor (for high pressure side) connector.

    2. Turn the ignition switch to ON.

    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 fuel pressure sensor (for high pressure side).

      Click here


  11. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (FUEL PRESSURE SENSOR (FUEL DELIVERY PIPE WITH SENSOR ASSEMBLY) (FOR LOW PRESSURE SIDE))


    1. Disconnect the fuel pressure sensor (fuel delivery pipe with sensor assembly) (for low pressure side) connector.

    2. Turn the ignition switch to ON.

    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 fuel pressure sensor (fuel delivery pipe with sensor assembly) (for low pressure side).

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    • AClick here
    • B

      REPLACE FUEL PRESSURE SENSOR (FUEL DELIVERY PIPE WITH SENSOR ASSEMBLY) (FOR LOW PRESSURE SIDE)Click here

  12. 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 ignition switch to ON.

    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


  13. Click here

    CHECK HARNESS AND CONNECTOR


    1. Disconnect the throttle body with motor assembly connector.

    2. Disconnect the crankshaft position sensor connector.

    3. Disconnect the camshaft position sensor (for intake camshaft) connector.

    4. Disconnect the camshaft position sensor (for exhaust camshaft) connector.

    5. Disconnect the manifold absolute pressure sensor connector.

    6. Disconnect the oil pressure sensor (oil pressure sender gauge assembly) connector.

    7. Disconnect the accelerator pedal sensor assembly connector.

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

    9. Disconnect the fuel pressure sensor (for high pressure side) connector.

    10. Disconnect the fuel pressure sensor (fuel delivery pipe with sensor assembly) (for low pressure side) 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
      C57-109 (VCTA) - Body ground Always 10 kΩ or higher
      C57-116 (VCNE) - Body ground Always 10 kΩ or higher
      C57-88 (VCV1) - Body ground Always 10 kΩ or higher
      C57-113 (VCE1) - Body ground Always 10 kΩ or higher
      C57-121 (VCPM) - Body ground Always 10 kΩ or higher
      C57-99 (VCPE) - Body ground Always 10 kΩ or higher
      A24-57 (VCPA) - Body ground Always 10 kΩ or higher
      A24-60 (VCP2) - Body ground Always 10 kΩ or higher
      C57-78 (VCVG) - Body ground Always 10 kΩ or higher
      C57-98 (VCPR) - Body ground Always 10 kΩ or higher
      C57-84 (VCPF) - Body ground Always 10 kΩ or higher

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

      Tip:

      Remove the VVT, EFI-MAIN NO. 2 and EFI-MAIN NO. 3 relays connected between the checked terminals as the coil inside the relay influences the measurement value.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A24-9 (+B) - 1 (EFI NO. 1 fuse) Always Below 1 Ω
      A24-35 (+B2) - 1 (EFI NO. 1 fuse) Always Below 1 Ω
      A24-9 (+B) - Body ground Always 10 kΩ or higher
      A24-35 (+B2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE ECMClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR