Sfi System (For Sedan) Mil Circuit

Engine Hybrid System. Yaris. Ncp93, 131
1Nz-Fe Engine Control. Yaris. Ncp93, 131

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 - ECM)

CHECK THAT MIL IS ILLUMINATED

CHECK THAT ENGINE STARTS

INSPECT COMBINATION METER ASSEMBLY (MIL CIRCUIT)

SFI SYSTEM (for Sedan) - MIL Circuit


DESCRIPTION

The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunction detections by the ECM. When the ignition switch is turned to ON, 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 ignition switch is first turned to ON, the MIL should be illuminated and should then turn off. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using a Techstream.

WIRING DIAGRAM


Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Mil Circuit


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.CHECK THAT MIL IS ILLUMINATED

  1. Perform troubleshooting in accordance with the table below.

    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 Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

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

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

    Result
    Result
    		Proceed to
    No DTC detected
    		A
    Any DTC detected
    		B


B
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (YARIS_NCP93 RM000000PDF0E6X.html)
A


3.CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS)
Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Mil Circuit

  1. Disconnect the A21 ECM connector.

  1. Turn the ignition switch to ON.

  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 (YARIS_NCP93 RM000001CN002AX.html)

4.CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM)
Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Mil Circuit

  1. Disconnect the A21 ECM connector.

  1. Disconnect the D76 combination meter connector.

  1. Check the resistance.

    Standard resistance (Check for short):
    Tester Connections
    		Specified Conditions
    W (A21-24) or combination meter (D76-4) - Body ground
    		10 kΩ or higher

  1. Reconnect the ECM connector.

  1. Reconnect the combination meter connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPAIR OR REPLACE COMBINATION METER ASSEMBLY

5.CHECK THAT MIL IS ILLUMINATED

  1. Check if the MIL is illuminated when the ignition switch is turned to ON.

    OK:
    MIL should be illuminated.


NG
Go to step 6
OK

CHECK FOR INTERMITTENT PROBLEMS (YARIS_NCP93 RM000000PDQ0NOX.html)

6.CHECK THAT ENGINE STARTS

  1. Turn the ignition switch to ON.

  1. Start the engine.

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


B
GO TO VC OUTPUT CIRCUIT (YARIS_NCP93 RM000001D6V0H7X.html)
A


7.INSPECT COMBINATION METER ASSEMBLY (MIL CIRCUIT)

  1. Check the MIL circuit (YARIS_NCP93 RM000001DAG00QX.html).



NG
REPAIR OR REPLACE COMBINATION METER ASSEMBLY
OK

CHECK AND REPLACE HARNESS OR CONNECTOR (COMBINATION METER - ECM)