Ecd System Mil Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK THAT MIL IS ILLUMINATED

CHECK WHETHER DTC OUTPUT RECURS

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

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)

CHECK THAT ENGINE STARTS

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)

ECD 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 turned to on (IG), the MIL should be illuminated and should turn off after engine is started. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the GTS.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System.Ecd System Mil Circuit


INSPECTION PROCEDURE

NOTICE:
  1. Inspect the fuses of circuits related to this system before performing the following inspection procedure.
  2. After replacing the ECM, the new ECM needs registration (LandCruiser RM0000012XK0AVX.html) and initialization (LandCruiser RM000000TIN08IX.html).
1.CHECK THAT MIL IS ILLUMINATED

  1. Turn the engine switch to on (IG).

  1. Check the illumination condition of the MIL.

    Result
    Result
    		Proceed to
    MIL remains on
    		A
    MIL does not illuminate
    		B
    Illuminates → Turns off
    		C


B
Go to step 5

C
CHECK FOR INTERMITTENT PROBLEMS (LandCruiser RM000000PDQ1A0X.html)
A


2.CHECK WHETHER DTC OUTPUT RECURS

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG).

  1. Turn the GTS on.

  1. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

  1. Check if any DTCs have been detected. Note down any DTCs.

    Result
    Result
    		Proceed to
    DTC is not output
    		A
    Any DTCs is output
    		B
    HINT:
    Check for detected DTCs output from other ECUs which relate to the MIL.


B
REPAIR CIRCUIT INDICATED BY OUTPUT DTC
A


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.


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

  1. Reconnect the ECM connector.



B
REPLACE ECM (LandCruiser RM0000013Z002DX.html)
A


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

  1. Disconnect the combination meter assembly connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    G7-7 (CHK) or G184-7 (W) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the combination meter assembly connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE COMBINATION METER ASSEMBLY (LandCruiser RM000003QKY01CX.html)

5.CHECK THAT ENGINE STARTS

  1. Turn the engine switch to on (IG).

  1. Start the engine.

    Result
    Result
    		Proceed to
    Engine starts
    		A
    Engine does not start
    		B


B
GO TO VC OUTPUT CIRCUIT (LandCruiser RM000001D6V0X2X.html)
A


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

  1. Disconnect the combination meter assembly connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    G7-7 (CHK) - G184-7 (W)
    		Always
    		Below 1 Ω

  1. Reconnect the combination meter assembly connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE COMBINATION METER ASSEMBLY (LandCruiser RM000003QKY01CX.html)