SFI SYSTEM(w/ GPF) VC Output Circuit

DESCRIPTION

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

B008GZCE19

When the VC circuit is short-circuited, the microprocessor in the ECM and the sensors that are supplied with power through the VC circuit are inactivated because power is not supplied from the VC circuit. Under this condition, the system does not start up and the MIL does not illuminate even if the system malfunctions.

Tech Tips

Under normal conditions, the MIL is illuminated for several seconds when the engine switch is turned on (IG). The MIL goes off when the engine is started.

WIRING DIAGRAM


B008I4UE02
B008IZPE01

PROCEDURE


  1. CHECK COMMUNICATION 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.

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

    B

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    A

  2. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ECM)


    1. Turn the engine switch on (IG).

    2. B008H53C01
      *1 NO. 1 ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY
      *2 EFI NO.1 fuse

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

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

      Tech Tips


      • Check the fuse with it installed to the No. 1 engine room relay block and junction block assembly.

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

      Result
      Proceed to
      OK
      NG

    NG

    GO TO ECM POWER SOURCE CIRCUIT Click here

    OK

  3. CHECK MIL (THROTTLE POSITION SENSOR)


    1. Disconnect the throttle with motor body assembly connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Result
      Result Proceed to
      MIL does not illuminate A
      MIL illuminates B

      Tech Tips

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

      Click here


    B

    REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY Click here

    A

  4. CHECK MIL (ACCELERATOR PEDAL POSITION SENSOR)


    1. Disconnect the accelerator pedal sensor assembly connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Result
      Result Proceed to
      MIL does not illuminate A
      MIL illuminates B

    B

    REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY Click here

    A

  5. 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 does not illuminate A
      MIL illuminates B

    B

    REPLACE CRANKSHAFT POSITION SENSOR Click here

    A

  6. CHECK MIL (CAMSHAFT POSITION SENSOR FOR INTAKE CAMSHAFT)


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

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Result
      Result Proceed to
      MIL does not illuminate A
      MIL illuminates B

    B

    REPLACE CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) Click here

    A

  7. CHECK MIL (CAMSHAFT POSITION SENSOR FOR EXHAUST CAMSHAFT)


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

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Result
      Result Proceed to
      MIL does not illuminate A
      MIL illuminates B

    B

    REPLACE CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT) Click here

    A

  8. CHECK MIL (OIL PRESSURE SENDER GAUGE ASSEMBLY)


    1. Disconnect the oil pressure sender gauge assembly.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Result
      Result Proceed to
      MIL does not illuminate A
      MIL illuminates B

    B

    REPLACE OIL PRESSURE SENDER GAUGE ASSEMBLY Click here

    A

  9. CHECK MIL (FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE))


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

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Result
      Result Proceed to
      MIL does not illuminate A
      MIL illuminates B

      Tech Tips

      Perform "Inspection After Repair" after replacing the fuel pressure sensor (for high pressure side).

      Click here


    B

    REPLACE FUEL DELIVERY PIPE SUB-ASSEMBLY (FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE)) Click here

    A

  10. CHECK MIL (FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE))


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

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Result
      Result Proceed to
      MIL does not illuminate A
      MIL illuminates B

      Tech Tips

      Perform "Inspection After Repair" after replacing the fuel pressure sensor (for low pressure side).

      Click here


    B

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

    A

  11. CHECK MIL (NO. 1 TURBO PRESSURE SENSOR)


    1. Disconnect the No. 1 turbo 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

    B

    REPLACE NO. 1 TURBO PRESSURE SENSOR Click here

    A

  12. CHECK MIL (NO. 2 TURBO PRESSURE SENSOR)


    1. Disconnect the No. 2 turbo 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

    B

    REPLACE NO. 2 TURBO PRESSURE SENSOR Click here

    A

  13. CHECK MIL (DIFFERENTIAL PRESSURE SENSOR)


    1. Disconnect the differential 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

    B

    REPLACE DIFFERENTIAL PRESSURE SENSOR Click here

    A

  14. CHECK HARNESS AND CONNECTOR


    1. Disconnect the throttle with motor body assembly connector.

    2. Disconnect the accelerator pedal sensor assembly connector.

    3. Disconnect the crankshaft position sensor connector.

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

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

    6. Disconnect the oil pressure sender gauge assembly connector.

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

    8. Disconnect the fuel pressure sensor (for low pressure side) connector.

    9. Disconnect the No. 1 turbo pressure sensor connector.

    10. Disconnect the No. 2 turbo pressure sensor connector.

    11. Disconnect the differential pressure sensor connector.

    12. Disconnect the ECM connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C20-121 (VCTA) - Body ground and other terminals Always 10 kΩ or higher
      A35-49 (VCPA) - Body ground and other terminals Always 10 kΩ or higher
      A35-52 (VCP2) - Body ground and other terminals Always 10 kΩ or higher
      C20-110 (VCNE) - Body ground and other terminals Always 10 kΩ or higher
      C20-113 (VCV1) - Body ground and other terminals Always 10 kΩ or higher
      C20-111 (VCE1) - Body ground and other terminals Always 10 kΩ or higher
      C20-130 (VCPE) - Body ground and other terminals Always 10 kΩ or higher
      C20-136 (VCPR) - Body ground and other terminals Always 10 kΩ or higher
      C20-134 (VCPF) - Body ground and other terminals Always 10 kΩ or higher
      C20-138 (VCPM) - Body ground and other terminals Always 10 kΩ or higher
      C20-140 (VPTA) - Body ground and other terminals Always 10 kΩ or higher
      C20-80 (VCPX) - Body ground and other terminals Always 10 kΩ or higher
      A35-2 (+B) - 1 (EFI NO. 1 fuse) Always Below 1Ω
      A35-3 (+B) - 1 (EFI NO. 1 fuse) Always Below 1Ω
      A35-2 (+B) - Body ground and other terminals Always 10 kΩ or higher
      A35-3 (+B) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR