Ecd System Mil Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK MIL CONDITION

CHECK IF MIL TURNS OFF

CHECK HARNESS AND CONNECTOR (FOR SHORT)

CHECK HARNESS AND CONNECTOR (ECM - COMBINATION METER)

CHECK IF MIL ILLUMINATES

INSPECT COMBINATION METER (MIL CIRCUIT)

ECD SYSTEM - MIL Circuit


DESCRIPTION

The MIL is used to inform the user when the ECM has detected a vehicle malfunction.
By turning the ignition switch ON, power is supplied to the MIL circuit, and the ECM provides the circuit ground that illuminates the MIL.
Operation of the MIL should be checked visually:
When the ignition switch is first turned ON, the MIL should illuminate. When the engine is started, the MIL should turn off.

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System.Ecd System Mil Circuit


INSPECTION PROCEDURE

1.CHECK MIL CONDITION
HINT:
Use the table below to troubleshoot each problem symptom.
Result:
Condition
Proceed to
MIL remains ON
A
MIL does not illuminate
B


B
Go to step 5
A


2.CHECK IF MIL TURNS OFF

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and turn the tester ON.

  1. Check if DTCs have been stored (Toyota Fortuner RM000000VR6004X.html). If DTCs are present, write them down.

  1. Clear the DTCs using the intelligent tester (Toyota Fortuner RM000000VR6004X.html).

  1. Check that the MIL turns off.

    OK:
    The MIL turns off.


OK
REPAIR CIRCUIT INDICATED BY OUTPUT DTC
NG


3.CHECK HARNESS AND CONNECTOR (FOR SHORT)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System.Ecd System Mil Circuit

  1. Disconnect the E23 ECM connector.

  1. Turn the ignition switch ON.

  1. Check that the MIL is not illuminated.

    OK:
    The MIL is not illuminated.


OK
REPLACE ECM
NG


4.CHECK HARNESS AND CONNECTOR (ECM - COMBINATION METER)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System.Ecd System Mil Circuit

  1. Disconnect the E23 ECM connector.

  1. Disconnect the C10 combination meter connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    E23-5 (W) - C10-39
    		Below 1 Ω
    E23-5 (W) or C10-39 - Body ground
    		10 kΩ or higher


OK
REPAIR OR REPLACE HARNESS OR CONNECTOR
NG

REPLACE COMBINATION METER

5.CHECK IF MIL ILLUMINATES

  1. Check that the MIL illuminates when turning the ignition switch ON.

    OK:
    The MIL illuminates.


OK
NORMAL
NG


6.INSPECT COMBINATION METER (MIL CIRCUIT)

  1. See the combination meter troubleshooting procedures (Toyota Fortuner RM0000011IT006X.html).



NG
REPAIR OR REPLACE COMBINATION METER
OK

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