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Home >> Lexus >> 2007 >> SC 430 >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication >> Can Communication System >> Gateway ECU Communication Stop Mode >> Inspection Procedure

Inspection Procedure

  1. CHECK CAN BUS LINE FOR DISCONNECTION 
    1. Disconnect the G3 gateway ECU connector.
      Fig 1: Identifying G3 Gateway ECU Connector Terminals
      G05294550Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      G3-17 (CA1H) - G3-18 (CA1L) Ignition switch OFF 54 to 69 Ω

    NG: REPAIR OR REPLACE GATEWAY ECU SUB BUS LINE AND CONNECTOR 

    OK: Go to Next step 

  2. CHECK WIRE HARNESS (GATEWAY ECU - BATTERY AND BODY GROUND) 
    1. Disconnect the G3 gateway ECU connector.
      Fig 2: Identifying G3 Gateway ECU Connector Terminals
      G05294551Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      G3-24 (GND) - Body ground Always Below 1 Ω
    3. Measure the voltage of the wire harness side connector.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      G3-10 (BATT) - Body ground Always 10 to 14 V
      G3-2 (ACC) - Body ground Ignition switch ACC 10 to 14 V
      G3-1 (IG) - Body ground Ignition switch ON 10 to 14 V

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: REPLACE GATEWAY ECU 

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