CAN COMMUNICATION SYSTEM(for LHD), Diagnostic DTC:U0198

DTC Code DTC Name
U0198 Lost Communication with Telematic Control Module

DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
U0198 Lost Communication with Telematic Control Module There is no communication from the telematics transceiver.

  • Power source circuit of telematics transceiver

  • Telematics transceiver ground circuit

  • Telematics transceiver CAN branch wire or connector

  • Telematics transceiver

 Network gateway ECU

For vehicles with a telematics transceiver.

WIRING DIAGRAM

A01XOCIE06

CAUTION / NOTICE / HINT

Note


  • Before measuring the resistance of the CAN bus, turn the engine switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here

  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

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  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

  • DTC check procedure: Turn the engine switch on (IG) and wait at least 8.2 seconds.

  • After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed.

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  • Inspect the fuses for circuits related to this system before performing the following procedure.

Tech Tips


  • Operating the engine switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE


  1. RECONFIRM DTC OUTPUT


    1. Check for DTCs.


      Body Electrical > Gateway > Trouble Codes

      Tech Tips

      If DTC U1002 is output from the gateway of the network gateway ECU, this indicates a sub bus 2 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 2.

      Result
      Result Proceed to
      U1002 is not output from network gateway ECU A
      U1002 is output from network gateway ECU B

    B

    GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC Click here

    A

  2. CHECK FOR OPEN IN CAN BUS WIRE (TELEMATICS TRANSCEIVER BRANCH WIRE)


    1. B005BDBC06
      *a

      Front view of wire harness connector

      (to Telematics Transceiver)

      Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect the telematics transceiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I40-15 (CANP) - I40-16 (CANN) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (TELEMATICS TRANSCEIVER)

    OK

  3. CHECK HARNESS AND CONNECTOR (TELEMATICS TRANSCEIVER - BODY GROUND)


    1. A01XOD0C28
      *a

      Front view of wire harness connector

      (to Telematics Transceiver)

      Reconnect the cable to the negative (-) battery terminal.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I40-4 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (TELEMATICS TRANSCEIVER - BATTERY)


    1. A01XOD0C29
      *a

      Front view of wire harness connector

      (to Telematics Transceiver)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I40-1 (+B) - Body ground Always 11 to 14 V
      I40-7 (IG2) - Body ground Engine switch on (IG) 11 to 14 V
      I40-8 (ACC) - Body ground Engine switch on (ACC) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TELEMATICS TRANSCEIVER Click here

    NG

  5. CHECK HARNESS AND CONNECTOR (TELEMATICS TRANSCEIVER - ENGINE STOP AND START ECU)


    1. Disconnect the I57 engine stop and start ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I40-1 (+B) - I57-2 (BO1) Always Below 1 Ω
      I40-7 (IG2) - I57-12 (IGO1) Always Below 1 Ω
      I40-8 (ACC) - I57-3 (ACO) Always Below 1 Ω
      I40-1 (+B) or I57-2 (BO1) - Body ground Always 10 kΩ or higher
      I40-7 (IG2) or I57-12 (IGO1) - Body ground Always 10 kΩ or higher
      I40-8 (ACC) or I57-3 (ACO) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STOP AND START SYSTEM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR