Can Communication System (W/ Vsc) How To Proceed With Troubleshooting

  1. VEHICLE BROUGHT TO WORKSHOP

  2. INSPECT BATTERY VOLTAGE

  3. CHECK AND CLEAR DTC*

  4. CHECK INSTALLED SYSTEMS (ECU AND SENSOR) THAT USE CAN COMMUNICATION

  5. CHECK DLC3 BRANCH WIRE AND CAN BUS CIRCUIT MAIN WIRE (CANH - CANL)

  6. CHECK CAN BUS CIRCUIT +B (CANH, CANL - BAT)

  7. CHECK CAN BUS CIRCUIT GND (CANH, CANL - CG)

  8. CHECK ECUS CONNECTED TO CAN BUS*

  9. CHECK COMMUNICATION MALFUNCTION DTC (PAST DTC CHECK)*

  10. CHECK DTC COMBINATION TABLE (CAN BUS CIRCUIT BRANCH WIRE OPEN PAST MALFUNCTION)

  11. PERFORM MALFUNCTION SIMULATION TEST (CAN BUS CIRCUIT MAIN WIRE PAST MALFUNCTION)*

  12. ADJUST, REPAIR AND REPLACE

  13. CONFIRMATION TEST

Can Communication System (W/ Vsc) -- How To Proceed With Troubleshooting


CAUTION:
For vehicles with SRS:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
NOTICE:
  1. DTCs for the CAN communication system are as follows: U0073, U0100, U0123, U0124 and U0126.
  2. Refer to the troubleshooting procedures of each system if DTCs regarding the CAN communication system are not output.
  3. Before measuring the resistance, leave the vehicle for at least 1 minute and do not operate the ignition switch, any switches or any doors. If doors need to be opened in order to check connectors, open the doors and leave them open.
  4. When disconnecting the cable from the negative (-) battery terminal, some systems need to be initialized after the cable is reconnected (Toyota Fortuner RM000004W63000X.html).
HINT:
  1. Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
  2. *: Use the intelligent tester.


1.VEHICLE BROUGHT TO WORKSHOP

    NEXT


    2.INSPECT BATTERY VOLTAGE
      Standard voltage:
      11 to 14 V
      If the voltage is below 11 V, recharge or replace the battery before proceeding.

    NEXT


    3.CHECK AND CLEAR DTC*

    1. Using the intelligent tester, perform the all DTC check.

      NOTICE:
      1. If a CAN communication trouble code that indicates that an ECU or sensor has a power malfunction or interior malfunction which is causing a communication stop, the problem may not be in the communication line. There is a high possibility that the ECU or sensor has a signal transmission failure. Therefore, first troubleshoot any DTCs related to the ECU or sensor.
      2. When CAN communication related connectors are disconnected with the ignition switch ON or ACC, the ECU related to the connector and ECUs of related systems will store a CAN communication DTC.

    NEXT


    4.CHECK INSTALLED SYSTEMS (ECU AND SENSOR) THAT USE CAN COMMUNICATION

    1. Based on the vehicle equipment and specifications, confirm the systems that use CAN communication (Toyota Fortuner RM000002VT900NX.html).


    NEXT


    5.CHECK DLC3 BRANCH WIRE AND CAN BUS CIRCUIT MAIN WIRE (CANH - CANL)

    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.



      2. Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Can Communication.Can Communication System (W/ Vsc).Can Communication System (W/ Vsc) How To Proceed With Troubleshooting

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance:
      Tester Connection
      		Switch Condition
      		Specified Condition
      		Proceed to
      D3-6 (CANH) - D3-14 (CANL)
      		Ignition switch off
      		OK (54 to 69 Ω)
      		A
      D3-6 (CANH) - D3-14 (CANL)
      		Ignition switch off
      		NG (70 Ω or higher)
      		B
      D3-6 (CANH) - D3-14 (CANL)
      		Ignition switch off
      		NG (less than 54 Ω)
      		C


    		B.
    GO TO OPEN IN CAN MAIN BUS LINE (Toyota Fortuner RM000002VTL00PX.html)

    		C.
    GO TO CHECK CAN BUS LINES FOR SHORT CIRCUIT (Toyota Fortuner RM000002L7Z06QX.html)
    A


    6.CHECK CAN BUS CIRCUIT +B (CANH, CANL - BAT)


      Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Can Communication.Can Communication System (W/ Vsc).Can Communication System (W/ Vsc) How To Proceed With Troubleshooting

    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance:
      Tester Connection
      		Switch Condition
      		Specified Condition
      D3-6 (CANH) - D3-16 (BAT)
      		Ignition switch off
      		6 kΩ or higher
      D3-14 (CANL) - D3-16 (BAT)
      		Ignition switch off
      		6 kΩ or higher


    		NG.
    GO TO CHECK CAN BUS LINE FOR SHORT TO +B (Toyota Fortuner RM000002L80023X.html)
    OK


    7.CHECK CAN BUS CIRCUIT GND (CANH, CANL - CG)


      Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Can Communication.Can Communication System (W/ Vsc).Can Communication System (W/ Vsc) How To Proceed With Troubleshooting

    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance:
      Tester Connection
      		Switch Condition
      		Specified Condition
      D3-6 (CANH) - D3-4 (CG)
      		Ignition switch off
      		200 Ω or higher
      D3-14 (CANL) - D3-4 (CG)
      		Ignition switch off
      		200 Ω or higher


    		NG.
    GO TO CHECK CAN BUS LINE FOR SHORT TO GND (Toyota Fortuner RM000002L8101VX.html)
    OK


    8.CHECK ECUS CONNECTED TO CAN BUS*

    1. Connect the cable to the negative (-) battery terminal.

      NOTICE:
      When disconnecting the cable from the negative (-) battery terminal, some systems need to be initialized after the cable is reconnected (Toyota Fortuner RM000004W63000X.html).

    2. Select "Bus Check" from "System Select".

    3. Wait 1 minute and then check the display of the connected ECUs and sensors.

      Inspection Result
      		Proceed to
      All ECUs and sensors connected to CAN communication system displayed on screen.
      		A
      ECU or sensor that should be connected to CAN communication is not displayed (ECU or sensor branch wire open).
      		B
      ECU or sensor that should be connected to CAN communication is not displayed or display is intermittent during check (ECU or sensor branch wire open on one side).
      		C
      NOTICE:
      ECUs and sensors that are not present will not be displayed. Be careful not to mistake them for communication stop malfunctions.
      HINT:
      If the display of an ECU is intermittent during the check, one side of an ECU or sensor branch wire is open. (The signal of the ECU is treated as noise, which affects the response and display of the intelligent tester.)


    		B.
    GO TO PROBLEM SYMPTOMS TABLE (Toyota Fortuner RM000002VT400OX.html)

    		C.
    GO TO OPEN IN ONE SIDE OF CAN BRANCH WIRE FLOWCHART (Toyota Fortuner RM000002VTG00PX.html)
    A


    9.CHECK COMMUNICATION MALFUNCTION DTC (PAST DTC CHECK)*

    1. Select "Bus Check" from "System Select".

    2. Write down all of the DTCs stored in each ECU.

      HINT:
      1. If there are communication malfunction DTCs stored but the intelligent tester's "Bus Check - Communication Bus Check" screen displays all of the ECUs and sensors connected to the CAN system, the communication malfunction DTCs may be past malfunctions that are no longer present.
      2. For CAN bus main wire malfunctions, related ECUs are also detected. Therefore, determine the malfunctioning area based on all of the DTCs that are output.

    NEXT


    10.CHECK DTC COMBINATION TABLE (CAN BUS CIRCUIT BRANCH WIRE OPEN PAST MALFUNCTION)

    1. Based on the combination of stored CAN communication system DTCs, determine which ECUs and sensors have a communication stop malfunction (Toyota Fortuner RM000002VT900NX.html).


    NEXT


    11.PERFORM MALFUNCTION SIMULATION TEST (CAN BUS CIRCUIT MAIN WIRE PAST MALFUNCTION)*

    1. Using the intelligent tester, clear all DTCs.

    2. Perform a malfunction simulation test on all harnesses and connectors related to the CAN bus circuit main wire.

    3. Check the DTCs that were stored as a result of the malfunction simulation test. Then determine the malfunctioning area.


    NEXT


    12.ADJUST, REPAIR AND REPLACE

      NEXT


      13.CONFIRMATION TEST

        NEXT

        END