Sfi System Vc Output Circuit

Двигатель. Toyota Rav4. Aca30, 33, 38 Ala30
Система Управления Двигателем 2Az-Fe. Toyota Rav4. Aca30, 33, 38 Ala30

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK MIL CONDITION

CHECK CONNECTION BETWEEN INTELLIGENT TESTER AND ECM

CHECK MIL (BATTERY CURRENT SENSOR ASSEMBLY)

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.

Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Az-Fe.Система Sfi.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.
УКАЗАНИЕ:
Under normal conditions, the MIL is illuminated for several seconds when the ignition switch is first turned on (IG). The MIL goes off when the engine is started.

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Az-Fe.Система Sfi.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 on (IG).

    OK:
    MIL lights up


OK
SYSTEM OK
NG


2.CHECK CONNECTION BETWEEN INTELLIGENT TESTER AND ECM

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and tester ON.

  1. Check the 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 (BATTERY CURRENT SENSOR ASSEMBLY)

  1. Disconnect the B31 battery current sensor connector.

  1. Turn the ignition switch on (IG).

  1. Check the MIL.

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

  1. Reconnect the battery current sensor connector.



A
REPLACE BATTERY CURRENT SENSOR ASSEMBLY
B


4.CHECK MIL (THROTTLE POSITION SENSOR)

  1. Disconnect the B3 throttle body connector.

  1. Turn the ignition switch on (IG).

  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


5.CHECK MIL (ACCELERATOR PEDAL POSITION SENSOR)

  1. Disconnect the A6 accelerator pedal position sensor connector.

  1. Turn the ignition switch on (IG).

  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 ROD ASSEMBLY
B


6.CHECK HARNESS AND CONNECTOR

  1. Disconnect the B31 battery current sensor connector.

  1. Disconnect the B3 throttle body connector.

  1. Disconnect the A6 accelerator pedal position sensor connector.



    Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Az-Fe.Система Sfi.Sfi System Vc Output Circuit

  1. Disconnect the A12 and B32 ECM connectors.

  1. Measure the resistance.

    Standard resistance (check for short):
    Tester Connection
    		Specified Condition
    VCIB (B32-69) - Body ground
    		10 kΩ or higher
    VCTA (B32-67) - Body ground
    VCPA (A12-57) - Body ground
    VCP2 (A12-58) - Body ground

  1. Reconnect the battery current sensor connector.

  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