Sfi System Vc Output Circuit

Engine. Camry. Acv40 Gsv40
2Az-Fe Engine Control System. Camry. Acv40 Gsv40

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK MIL CONDITION

CHECK CONNECTION BETWEEN INTELLIGENT TESTER AND ECM

CHECK MIL (THROTTLE POSITION SENSOR)

CHECK MIL (ACCELERATOR PEDAL POSITION SENSOR)

CHECK HARNESS AND CONNECTOR

SFI SYSTEM - VC Output Circuit


DESCRIPTION

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

Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System.Sfi System Vc Output Circuit

When the VC circuit is short-circuited, the microprocessor in the ECM and sensors that are supplied with power through the VC circuit are inactivated because the 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.
HINT:
Under normal conditions, the MIL is illuminated for several seconds when the ignition switch is first turned to the ON position. The MIL goes off when the engine is started.

WIRING DIAGRAM


Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System.Sfi System Vc Output Circuit


INSPECTION PROCEDURE

1.CHECK MIL CONDITION

  1. Check that the Malfunction Indicator Lamp (MIL) lights up when turning the ignition switch to the ON position.

    OK:
    MIL lights up.


NG
Go to step 2
OK

SYSTEM OK

2.CHECK CONNECTION BETWEEN INTELLIGENT TESTER AND ECM

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to the ON position and turn the tester on.

  1. Check for communication between the tester and ECM.

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


A
GO TO MIL CIRCUIT
B


3.CHECK MIL (THROTTLE POSITION SENSOR)

  1. Disconnect the C5 throttle body connector.

  1. Turn the ignition switch to the ON position.

  1. Check the MIL.

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

  1. Reconnect the throttle body connector.



A
REPLACE THROTTLE BODY ASSEMBLY
B


4.CHECK MIL (ACCELERATOR PEDAL POSITION SENSOR)

  1. Disconnect the A17 accelerator pedal position sensor connector.

  1. Turn the ignition switch to the ON position.

  1. Check the MIL.

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

  1. Reconnect the accelerator pedal position sensor connector.



A
REPLACE ACCELERATOR PEDAL POSITION SENSOR
B


5.CHECK HARNESS AND CONNECTOR

  1. Disconnect the C5 throttle body connector.

  1. Disconnect the A17 accelerator pedal position sensor connector.



    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System.Sfi System Vc Output Circuit

  1. Disconnect the A24 and C24 ECM connectors.

  1. Measure the resistance between the terminals of the wire harness side connectors.

    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    VCTA (C24-67) - Body ground
    		10 kΩ or higher
    VCPA (A24-57) - Body ground
    VCP2 (A24-58) - Body ground

  1. Reconnect the throttle body connector.

  1. Reconnect the accelerator pedal position sensor connector.

  1. Reconnect the ECM connectors.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM