Sfi System Mil Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK THAT MIL IS ILLUMINATED

CHECK WHETHER MIL TURNS OFF

CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS)

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)

CHECK THAT MIL IS ILLUMINATED

CHECK THAT ENGINE STARTS

INSPECT COMBINATION METER ASSEMBLY (MIL CIRCUIT)

SFI SYSTEM - MIL Circuit


DESCRIPTION

The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunctions detected by the ECM. When the engine switch is turned to on (IG), power is supplied to the MIL circuit and the ECM provides the circuit ground which illuminates the MIL.
The MIL operation can be checked visually: When the engine switch is first turned to on (IG), the MIL should be illuminated, and should then turn off when the engine is started. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the GTS.

WIRING DIAGRAM

  1. for Automatic Transmission

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gr-Fe Engine Control.Sfi System.Sfi System Mil Circuit

  1. for Manual Transmission

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gr-Fe Engine Control.Sfi System.Sfi System Mil Circuit


INSPECTION PROCEDURE

1.CHECK THAT MIL IS ILLUMINATED

  1. Check that the MIL is illuminated.

    Result
    Result
    		Proceed to
    MIL remains on
    		A
    MIL does not illuminate
    		B


B
Go to step 5
A


2.CHECK WHETHER MIL TURNS OFF

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG) and turn the GTS on.

  1. Check for DTCs (LandCruiser RM000000PDK1DIX.html). If DTCs are output, write them down.

  1. Clear the DTCs (LandCruiser RM000000PDK1DIX.html).

  1. Check that the MIL turns off.

    OK:
    MIL turns off.


NG
Go to step 3
OK

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (LandCruiser RM000002ZSO015X.html)

3.CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS)

  1. Disconnect the ECM connector.

  1. Turn the engine switch on (IG).

  1. Check that the MIL is not illuminated.

    OK:
    MIL is not illuminated.

  1. Reconnect the ECM connector.



NG
Go to step 4
OK

REPLACE ECM (LandCruiser RM00000329203TX.html)

4.CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)

  1. Disconnect the ECM connector.

  1. Disconnect the combination meter assembly connector.

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

    Standard Resistance (Check for Open):
    for Automatic Transmission
    Tester Connection
    		Condition
    		Specified Condition
    G7-7 (CHK) - G56-21 (W)
    		Always
    		Below 1 Ω
    for Manual Transmission
    Tester Connection
    		Condition
    		Specified Condition
    G7-7 (CHK) - G55-13 (W)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    for Automatic Transmission
    Tester Connection
    		Condition
    		Specified Condition
    G7-7 (CHK) or G56-21 (W) - Body ground
    		Always
    		10 kΩ or higher
    for Manual Transmission
    Tester Connection
    		Condition
    		Specified Condition
    G7-7 (CHK) or G55-13 (W) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the ECM connector.

  1. Reconnect the combination meter connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE COMBINATION METER ASSEMBLY (LandCruiser RM000003QKY01CX.html)

5.CHECK THAT MIL IS ILLUMINATED

  1. Check if the MIL is illuminated when the engine switch is turned to on (IG).

    OK:
    MIL is illuminated.


NG
Go to step 6
OK

SYSTEM OK

6.CHECK THAT ENGINE STARTS

  1. Turn the engine switch on (IG).

  1. Start the engine.

    Result
    Result
    		Proceed to
    Engine starts
    		A
    Engine does not start*
    		B
    HINT:
    *: The GTS cannot communicate with the ECM.


B
GO TO VC OUTPUT CIRCUIT (LandCruiser RM000001D6V0W8X.html)
A


7.INSPECT COMBINATION METER ASSEMBLY (MIL CIRCUIT)

  1. Refer to the combination meter troubleshooting procedure (LandCruiser RM0000012GB0COX.html).



NG
REPLACE COMBINATION METER ASSEMBLY (LandCruiser RM000003QKY01CX.html)
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION METER ASSEMBLY - ECM)