ENGINE IMMOBILISER SYSTEM > ECU Power Source Circuit

for Preparation Click here


DESCRIPTION

This circuit provides power to the transponder key ECU.

WIRING DIAGRAM


B111577E02


B111830E02


INSPECTION PROCEDURE

1.CHECK FUSES (MPX-B, IGN, AM2 No.1)

  1. Remove the MPX-B, IGN fuses from the instrument panel J/B.

  1. Remove the AM2 No.1 (LHD, RHD) and AM2 No.2 (RHD) fuses from the fusible link block.

  1. Measure the resistance of the fuse(s).

    Resistance:
    Below 1 Ω



NG
CHECK FOR SHORT IN ALL HARNESS AND CONNECTOR CONNECTED TO FUSE AND REPLACE FUSE
OK


2.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - BATTERY)


    B111587E15

  1. Disconnect T8 ECU connector.

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

    Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    T8-2 (IG2) - Body ground
    		Ignition switch off
    		Below 1 V
    T8-2 (IG2) - Body ground
    		Ignition switch on
    		10 to 14 V
    T8-1 (CPUB) - Body ground
    		Always
    		0 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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


    B111587E14

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

    Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    T8-14 (GND) - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE