ENGINE IMMOBILISER SYSTEM > ECU Power Source Circuit

for Preparation Click here


DESCRIPTION

This circuit provides power to operate the transponder key ECU assembly.

WIRING DIAGRAM


B125450E01


INSPECTION PROCEDURE

1.INSPECT FUSES (ECU-B AND IGN)

  1. Remove the ECU-B fuse from the engine room R/B and J/B.

  1. Remove the IGN fuse from the driver side J/B.

  1. Measure the resistance of the fuse.

    Standard resistance:
    Below 1Ω

  1. Reinstall fuses.



NG
REPLACE FUSE
OK


2.INSPECT IGNITION SWITCH ASSEMBLY


    B110407E04

  1. Remove the ignition switch.

  1. Measure the resistance of the switch.

    Standard resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    5 (AM2) - 6 (IG2)
    		LOCK, ACC
    		10 kΩ or higher
    ON, START
    		Below 1 Ω


NG
REPLACE IGNITION SWITCH ASSEMBLY
OK


3.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - BATTERY AND BODY GROUND)


    B110782E08

  1. Disconnect the T10 ECU connector.

  1. Measure the resistance and voltage of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    T10-16 (GND) - Body ground
    		Always
    		Below 1 Ω

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    T10-1 (+B) - Body ground
    		Always
    		10 to 14 V
    T10-2 (IG) - Body ground
    		Ignition switch OFF
    		Below 1 V
    Ignition switch ON
    		10 to 14 V

  1. Reconnect the ECU connector.



NG
REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR
OK

REPLACE TRANSPONDER KEY ECU ASSEMBLY (Click here)