Ecd System Vc Output Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK MIL

CHECK COMMUNICATION BETWEEN INTELLIGENT TESTER AND ECM

CHECK MIL (ACCELERATOR PEDAL POSITION SENSOR)

CHECK MIL (THROTTLE POSITION SENSOR)

CHECK MIL (FUEL PRESSURE SENSOR)

CHECK MIL (EGR VALVE POSITION SENSOR)

CHECK MIL (MANIFOLD ABSOLUTE PRESSURE SENSOR)

CHECK MIL (NOZZLE VANE POSITION SENSOR)

CHECK HARNESS AND CONNECTOR

ECD SYSTEM - VC Output Circuit


DESCRIPTION

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

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Kd-Ftv Engine Control.Ecd System.Ecd 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 ON. The MIL goes off when the engine is started.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Kd-Ftv Engine Control.Ecd System.Ecd System Vc Output Circuit


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Kd-Ftv Engine Control.Ecd System.Ecd System Vc Output Circuit


INSPECTION PROCEDURE

NOTICE:
After replacing the ECM, the new ECM needs registration (LandCruiser RM0000012XK0ARX.html) and initialization (LandCruiser RM000000TIN08CX.html).
1.CHECK MIL

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

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


A
END
B


2.CHECK COMMUNICATION BETWEEN INTELLIGENT TESTER AND ECM

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON 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 (LandCruiser RM000000WZ11A8X.html)
B


3.CHECK MIL (ACCELERATOR PEDAL POSITION SENSOR)

  1. Disconnect the accelerator pedal position sensor connector.

  1. Turn the ignition switch to ON.

  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 (LandCruiser RM00000463000BX.html)
B


4.CHECK MIL (THROTTLE POSITION SENSOR)

  1. Disconnect the throttle position sensor connector.

  1. Turn the ignition switch to ON.

  1. Check the MIL.

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

  1. Reconnect the throttle position sensor connector.



A
REPLACE DIESEL THROTTLE BODY ASSEMBLY (LandCruiser RM0000013ZD02OX.html)
B


5.CHECK MIL (FUEL PRESSURE SENSOR)

  1. Disconnect the fuel pressure sensor connector.

  1. Turn the ignition switch to ON.

  1. Check the MIL.

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

  1. Reconnect the fuel pressure sensor connector.



A
REPLACE COMMON RAIL (LandCruiser RM0000044W3015X.html)
B


6.CHECK MIL (EGR VALVE POSITION SENSOR)

  1. Disconnect the EGR valve position sensor connector.

  1. Turn the ignition switch to ON.

  1. Check the MIL.

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

  1. Reconnect the EGR valve position sensor connector.



A
REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY (LandCruiser RM000002RK903UX.html)
B


7.CHECK MIL (MANIFOLD ABSOLUTE PRESSURE SENSOR)

  1. Disconnect the manifold absolute pressure sensor connector.

  1. Turn the ignition switch to ON.

  1. Check the MIL.

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

  1. Reconnect the manifold absolute pressure sensor connector.



A
REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR (LandCruiser RM0000045B300IX.html)
B


8.CHECK MIL (NOZZLE VANE POSITION SENSOR)

  1. Disconnect the nozzle vane position sensor connector.

  1. Turn the ignition switch to ON.

  1. Check the MIL.

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

  1. Reconnect the nozzle vane position sensor connector.



A
REPLACE TURBOCHARGER SUB-ASSEMBLY (LandCruiser RM000002S6F00ZX.html)
B


9.CHECK HARNESS AND CONNECTOR

  1. Disconnect the accelerator pedal position sensor connector.

  1. Disconnect the throttle position sensor connector.

  1. Disconnect the fuel pressure sensor connector.

  1. Disconnect the EGR position sensor connector.

  1. Disconnect the nozzle vane position sensor connector.

  1. Disconnect the manifold absolute pressure sensor 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
    G58-6 (VCPA) - Body ground
    		Always
    		10 kΩ or higher
    G58-4 (VCP2) - Body ground
    		Always
    		10 kΩ or higher
    C91-8 (VCVL) - Body ground
    		Always
    		10 kΩ or higher
    C90-14 (VCM) - Body ground
    		Always
    		10 kΩ or higher
    C90-13 (VCS) - Body ground
    		Always
    		10 kΩ or higher
    C91-13 (VCEG) - Body ground
    		Always
    		10 kΩ or higher
    C91-12 (VCPM) - Body ground
    		Always
    		10 kΩ or higher
    C91-11 (VNVC) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the accelerator pedal position sensor connector.

  1. Reconnect the throttle position sensor connector.

  1. Reconnect the fuel pressure sensor connector.

  1. Reconnect the EGR position sensor connector.

  1. Reconnect the nozzle vane position sensor connector.

  1. Reconnect the manifold absolute pressure sensor connector.

  1. Reconnect the ECM connectors.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (LandCruiser RM0000013Z002CX.html)