CAN COMMUNICATION SYSTEM(for LHD), Diagnostic DTC:U0202

DTC Code DTC Name
U0202 Lost Communication with "Door Control Module D"

DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area Note
U0202 Lost Communication with "Door Control Module D" No communication from the slide door motor unit LH continues.

  • Slide door motor unit LH branch line or connector

  • Power source circuit of slide door motor unit LH

  • Slide door motor unit LH ground circuit

  • Slide door motor unit LH

Tech Tips

The main body ECU (multiplex network body ECU) stores DTCs when it detects a communication stop or network communication error for ECUs connected to sub bus 1.

Tech Tips

This diagnostic procedure is for when DTC U0202 is output by the main body ECU (multiplex network body ECU) (GTS display: Main Body).

WIRING DIAGRAM

B006R0IE26
*a No. 5 CAN Junction Connector
*b from Battery
*c ECU-B NO. 1
*d Slide Door Motor Unit LH

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

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 or any 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.

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  • 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 for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.

  • 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. Reconfirm DTCs.


      Body Electrical > Main Body > Trouble Codes

      Tech Tips

      If DTC U1002 is output from Main Body of the main body ECU (multiplex network body ECU), this indicates a sub bus 1 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 1.

      Result
      Result Proceed to
      DTC U1002 is not output from the main body ECU (multiplex network body ECU) (GTS display: Main Body) A
      DTC U1002 is output from the main body ECU (multiplex network body ECU) (GTS display: Main Body) B

    B

    GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC Click here

    A

  2. CHECK FOR OPEN IN SUB BUS 1 LINES (SLIDE DOOR MOTOR UNIT LH BRANCH LINE)


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

    2. Disconnect the K19 slide door motor unit LH connector.

    3. B006P4OC29
      *a

      Front view of wire harness connector

      (to Slide Door Motor Unit LH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K19-7 (MPX1) - K19-6 (MPX2) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Result
      OK
      NG

    NG

    REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (SLIDE DOOR MOTOR UNIT LH)

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. B006P4OC31
      *a

      Front view of wire harness connector

      (to Slide Door Motor Unit LH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K19-3 (GND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω

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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K19-1 (B) - Body ground Always 11 to 14 V
      K19-5 (ECUB) - Body ground Always 11 to 14 V
      Result
      Result
      OK
      NG

    OK

    REPLACE SLIDE DOOR MOTOR UNIT LH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)