Sfi System Vc Output Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING GTS

CHECK TERMINAL VOLTAGE (POWER SOURCE OF ECM)

CHECK CONNECTION BETWEEN GTS AND ECM (THROTTLE POSITION SENSOR)

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

CHECK CONNECTION BETWEEN GTS AND ECM (AIR PRESSURE SENSOR)

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

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

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

CHECK HARNESS AND CONNECTOR

SFI SYSTEM - VC Output Circuit


DESCRIPTION

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

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.2Tr-Fe Engine Control.Sfi System.Sfi System Vc Output Circuit

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.
HINT:
Under normal conditions, the MIL is illuminated for several seconds when the ignition switch is first turned to ON. The MIL goes off when the engine is started.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.2Tr-Fe Engine Control.Sfi System.Sfi System Vc Output Circuit


INSPECTION PROCEDURE

1.READ VALUE USING GTS

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the GTS on.

  1. Check the communication between the GTS and ECM.

    HINT:
    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


B
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
A


2.CHECK TERMINAL VOLTAGE (POWER SOURCE OF ECM)
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.2Tr-Fe Engine Control.Sfi System.Sfi System Vc Output Circuit

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    G180-1(+B) - Body ground
    		Ignition switch ON
    		11 to 14 V
    G180-2(+B2) - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Component with harness connected
    (ECM)
    HINT:
    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.


NG
GO TO MIL CIRCUIT (LandCruiser RM000000WZ11AGX.html)
OK


3.CHECK CONNECTION BETWEEN GTS AND ECM (THROTTLE POSITION SENSOR)

  1. Disconnect the throttle body with motor assembly connector.

  1. Turn the ignition switch to ON.

  1. Turn the GTS on.

  1. Check the communication between the GTS and ECM.

    HINT:
    It can be checked using the "Engine and ECT" item of the Data List.
    Result
    Result
    		Proceed to
    Communication is not possible
    		A
    Communication is possible
    		B
    HINT:
    Perform "Inspection After Repair" after cleaning the throttle body (LandCruiser RM000004NJC03XX.html).


B
REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY (LandCruiser RM000000VWO038X.html)
A


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

  1. Disconnect the accelerator pedal position sensor connector.

  1. Turn the ignition switch to ON.

  1. Turn the GTS on.

  1. Check the communication between the GTS and ECM.

    HINT:
    It can be checked using the "Engine and ECT" item of the Data List.
    Result
    Result
    		Proceed to
    Communication is not possible
    		A
    Communication is possible
    		B


B
REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY (LandCruiser RM00000111V00GX.html)
A


5.CHECK CONNECTION BETWEEN GTS AND ECM (AIR PRESSURE SENSOR)

  1. Disconnect the air pressure sensor connector.

  1. Turn the ignition switch to ON.

  1. Turn the GTS on.

  1. Check the communication between the GTS and ECM.

    HINT:
    It can be checked using the "Engine and ECT" item of the Data List.
    Result
    Result
    		Proceed to
    Communication is not possible
    		A
    Communication is possible
    		B


B
REPLACE AIR PRESSURE SENSOR (LandCruiser RM000004XDW00CX.html)
A


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

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

  1. Turn the ignition switch to ON.

  1. Turn the GTS on.

  1. Check the communication between the GTS and ECM.

    HINT:
    It can be checked using the "Engine and ECT" item of the Data List.
    Result
    Result
    		Proceed to
    Communication is not possible
    		A
    Communication is possible
    		B


B
REPLACE MASS AIR FLOW METER SUB-ASSEMBLY
A


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

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

  1. Turn the ignition switch to ON.

  1. Turn the GTS on.

  1. Check the communication between the GTS and ECM.

    HINT:
    It can be checked using the "Engine and ECT" item of the Data List.
    Result
    Result
    		Proceed to
    Communication is not possible
    		A
    Communication is possible
    		B


B
REPLACE CAMSHAFT POSITION SENSOR (FOR INTAKE SIDE) (LandCruiser RM0000017EC00LX_01_0002.html)
A


8.CHECK CONNECTION BETWEEN GTS AND ECM (CAMSHAFT POSITION SENSOR (FOR EXHAUST SIDE))

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

  1. Turn the ignition switch to ON.

  1. Turn the GTS on.

  1. Check the communication between the GTS and ECM.

    HINT:
    It can be checked using the "Engine and ECT" item of the Data List.
    Result
    Result
    		Proceed to
    Communication is not possible
    		A
    Communication is possible
    		B


B
REPLACE CAMSHAFT POSITION SENSOR (FOR EXHAUST SIDE) (LandCruiser RM0000017EC00LX_01_0004.html)
A


9.CHECK HARNESS AND CONNECTOR

  1. Disconnect the throttle body with motor assembly connector.

  1. Disconnect the accelerator pedal sensor assembly connector.

  1. Disconnect the air pressure sensor connector (with air pressure sensor).

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

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

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

  1. Disconnect the ECM connectors.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    C153-29 (VCTA) - Body ground
    		Always
    		10 kΩ or higher
    G180-20 (VCPA) - Body ground
    		Always
    		10 kΩ or higher
    G180-22 (VCP2) - Body ground
    		Always
    		10 kΩ or higher
    C153-20 (VCAI) - Body ground
    		Always
    		10 kΩ or higher
    C153-31 (VCE1) - Body ground
    		Always
    		10 kΩ or higher
    C153-21 (VCV1) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (LandCruiser RM000000VW203EX.html)