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Home >> Scion >> 2009 >> xD Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication >> Can Communication System >> Check CAN Bus Line >> Inspection Procedure

Inspection Procedure

NOTE:
  • Turn the ignition switch off before measuring the resistances of the CAN main wire and the CAN branch wire.
  • After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.
  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If doors need to be opened in order to check connectors, open the doors and leave them open.

    HINT:

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

  1. CHECK CAN BUS WIRE (MAIN WIRE FOR DISCONNECTION, CAN BUS LINES FOR SHORT CIRCUIT) 
    1. Turn the ignition switch off.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Switch Condition Specified Condition Proceed to
      F16-6 (CANH) - F16-14 (CANL) Ignition switch off 54 to 69 Ω OK
      F16-6 (CANH) - F16-14 (CANL) Ignition switch off 69 Ω or higher NG-A
      F16-6 (CANH) - F16-14 (CANL) Ignition switch off 54 Ω or less NG-B

    NG-A : CHECK CAN MAIN WIRE FOR DISCONNECTION  (See CAN MAIN WIRE FOR DISCONNECTION  )

    NG-B : CHECK CAN BUS LINES FOR SHORT CIRCUIT  (See CHECK CAN BUS LINES FOR SHORT CIRCUIT  )

    Fig 1: Identifying DLC3 Connector Terminals
    G05403861Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  2. CHECK CAN BUS LINE FOR SHORT TO +B 
    1. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Switch Condition Specified Condition
      F16-6 (CANH) - F16-16 (BAT) Ignition switch off 6 kΩ or higher
      F16-14 (CANL) - F16-16 (BAT) Ignition switch off 6 kΩ or higher

    NG: CHECK CAN BUS LINE FOR SHORT TO +B  (See CHECK CAN BUS LINE FOR SHORT TO +B  )

    Fig 2: Identifying DLC3 Connector Terminals
    G05403862Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  3. CHECK CAN BUS LINE FOR SHORT TO GND 
    1. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Switch Condition Specified Condition
      F16-6 (CANH) - F16-4 (CG) Ignition switch off 200 Ω or higher
      F16-14 (CANL) - F16-4 (CG) Ignition switch off 200 Ω or higher

    NG: CHECK CAN BUS LINE FOR SHORT TO GND  (See CHECK CAN BUS LINE FOR SHORT TO GND  )

    Fig 3: Identifying DLC3 Connector Terminals
    G05403863Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : HOW TO PROCEED WITH TROUBLESHOOTING  (See HOW TO PROCEED WITH TROUBLESHOOTING  )

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