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Home › Lexus › 2005 › SC 430 › Repair and Diagnosis › Body & Frame › Door Locks › Engine Immobilizer System - Diagnostics › Ecu Power Source Circuit › Inspection Procedure

Inspection Procedure

  1. INSPECT FUSE (AM2, MPX-B1 IG2, IG2 MAIN, D/C CUT, IGN) 
    1. Remove the MPX-B1 and IG2 fuses from the passenger side J/B.
    2. Remove the AM2 M-fuse, D/C CUT and IG2 MAIN fuses from the engine room No. 1 R/B.
    3. Remove the IGN fuse from the engine room No. 2 R/B.
    4. Measure the resistance of the fuse.

      Standard: Below 1 Ω 

    1. NG: REPLACE FUSE 
    2. OK: Go to next step. 
  2. INSPECT RELAY (Marking: IG2) 
    1. Remove the IG2 relay from the engine room No. 1 R/B.
    2. Measure the resistance of the relay.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      3 - 5 10 k ohms or higher
      3 - 5 Below 1 ohms (when battery voltage is applied to terminals 1 and 2)
      Fig 1: Identifying IG2 Relay
      G02957059Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE RELAY 
    2. OK: Go to next step. 
  3. CHECK WIRE HARNESS (TRANSPONDER KEY ECU ASSY - BATTERY AND BODY GROUND) 
    1. Disconnect the T13 ECU connector.
    2. Measure the resistance and voltage of the wire harness side connector.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      T13-1 (CPUB) - Body ground Always 10 to 14 V
      T13-2 (IG2) - Body ground Ignition switch OFF 0 V
      T13-2 (IG2) - Body ground Ignition switch ON 10 to 14 V
      T13-14 (GND) - Body ground Always Below 1 ohms
      Fig 2: Disconnecting T13 Transponder Key ECU Connector
      G02957060Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: REPLACE TRANSPONDER KEY ECU ASSY 
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