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Home >> Infiniti >> 2010 >> M35 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 158 (Can Communication System) >> Can Communication System >> Main Body ECU Communication Stop Mode >> Inspection Procedure
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Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
      CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
      NOTE: After the ignition switch is turned OFF, the navigation system requires approximately 90 seconds to record various types of memory and settings. As a result, after turning the ignition switch OFF, wait 90 seconds or more before disconnecting the cable from the negative (-) battery terminal.
  2. CHECK FOR OPEN IN CAN BUS WIRE (MAIN BODY ECU BRANCH WIRE) 
    1. Disconnect the J2 main body ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION TABLE

      Tester Connection Switch Condition Specified Condition
      J2-5 (CANH) - J2-6 (CANL) Ignition switch OFF 54 to 69 Ω
      Fig 1: Identifying J2 Main Body ECU Connector Terminals
      G05163449Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE MAIN BODY ECU BRANCH WIRE OR CONNECTOR (CANH, CANL) 

    OK: Go to Next Step 

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY GROUND) 
    1. Reconnect the cable to the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
    2. Disconnect the DA, DB and DD main body ECU connectors.
    3. Measure the resistance according to the value(s) in the table below.
      Fig 2: Identifying DA, DB And DD Main Body ECU Connector Terminals
      G05163432Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION TABLE

      Tester Connection Condition Specified Condition
      DD-62 (GND1) - Body ground Always Below 1 Ω
    4. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION TABLE

      Tester Connection Condition Specified Condition
      DA-1 (ALTB) - Body ground Always 11 to 14 V
      DB-13 (BECU) - Body ground

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE MAIN BODY ECU 

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