ECU Power Source Circuit

ENGINE IMMOBILISER SYSTEM: ECU Power Source Circuit

ECU Power Source Circuit

DESCRIPTION

This circuit provides power to operate the transponder key ECU.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FUSE (IMB, IGN)
(a) Remove the IMB fuse and IGN fuse from the engine room relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





NG -- REPLACE FUSE
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - BATTERY AND BODY GROUND)





(a) Disconnect the J26 ECU connector.
(b) Measure the resistance and voltage according to the value(s) in the table below.
Standard resistance:
Standard voltage









NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE