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Home >> Lexus >> 2007 >> RX 400h AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 314 (Engine Immobilizer) >> Engine Immobilizer System >> ECU Power Source Circuit >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota FJ Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If the transponder key ECU is replaced, register the key and ECU communication ID.
  1. INSPECT FUSE (IGN FUSE) 
    1. Remove the IGN fuse.
      2. Fig 1: Identifying IGN Fuse
      G05580393Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      IGN fuse Always Below 1 Ω
      1. Reinstall the IGN fuse.

    NG: CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

    OK: Go to Next Step 

  2. INSPECT FUSE (ECU-B FUSE) 
    1. Remove the ECU-B fuse.
      2. Fig 2: Identifying ECU-B Fuse
      G05580394Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      ECU-B fuse Always Below 1 Ω
      1. Reinstall the ECU-B fuse.

    NG: CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

    OK: Go to Next Step 

  3. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - BATTERY) 
    1. Disconnect the E73 transponder key ECU connector.
      2. Fig 3: Identifying E73 Transponder Key ECU Connector
      G05580395Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE

      Tester Connection Condition Specified Condition
      E73-1 (+B) - Body ground Always 11 to 14 V
      E73-2 (IG) - Body ground Ignition switch OFF Below 1 V
      Ignition switch ON 11 to 14 V
    3. Reconnect the transponder key ECU connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  4. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - BODY GROUND) 
    Fig 4: Identifying E73 Transponder Key ECU Connector
    G05580396Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      E73-16 (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 

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