LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2007 >> GS 450h >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Engine Immobilizer >> Engine Immobiliser System >> Certification ECU Power Source Circuit >> Inspection Procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Inspection Procedure

  1. INSPECT FUSE (SECURITY) 
    1. Remove the SECURITY fuse from the main body ECU RH.
    2. Measure the resistance of the fuse.

      Standard resistance: 

      Below 1 Ω 

    NG: REPLACE FUSE 

    OK: GO TO Next Step 

  2. CHECK WIRE HARNESS (CERTIFICATION ECU - BATTERY AND BODY GROUND) 
    1. Disconnect the U28 ECU connector.
    2. Measure the resistance and voltage of the wire harness side connector.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      U28-17 (E) - Body ground Below 1 Ω

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Specified Condition
      U28-1 (+B1) - Body ground 10 to 14 V
      Fig 1: Identifying U28 ECU Connector
      G05306659Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

scientia non olet · About LEMON Manuals