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Home >> Lexus >> 2007 >> GS 430 >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication >> Can Communication System >> ECM Communication Stop Mode >> Inspection Procedure

Inspection Procedure

  1. CHECK CAN BUS LINE FOR DISCONNECTION (ECM SUB BUS LINE) 
    1. Turn the engine switch off.
    2. Disconnect the ECM connector (A6).
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Value
      A6-25 (CANH) - A6-24 (CANL) Engine switch off 54 to 69 Ω
    Fig 1: Identifying ECM Connector A6
    G05301390Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE ECM SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) 

    OK: Go to next step 

  2. CHECK WIRE HARNESS (+B1, +B, E) 
    1. Disconnect the ECM connector (A6).
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Value
      E7-7 (E1) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Value
      A6-5 (+B1) - Body ground Engine switch off 10 to 14 V
      A6-6 (+B) - Body ground Engine switch off 10 to 14 V
    Fig 2: Identifying ECM Connector A6 And E7
    G05301391Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ECM 

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