CAN COMMUNICATION SYSTEM, Diagnostic DTC:U0327

DTC Code DTC Name
U0327 Software Incompatibility with Vehicle Security Control Module

DESCRIPTION

The main body ECU will store this DTC when no signals can be received from the certification ECU while the CAN MS main bus is normal.

DTC No. DTC Detection Condition Trouble Area
U0327 No communication from certification ECU continues

  • Certification ECU power source circuit

  • Certification ECU

  • Certification ECU branch wire or connector

WIRING DIAGRAM

A017E2TE01

INSPECTION PROCEDURE

Note


  • Turn the ignition switch off before measuring the resistances of CAN bus main wires and CAN bus branch wires.

  • 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 any doors need to be opened in order to check connectors, open the doors and leave them open.

Tech Tips


  • Operating the ignition 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 will help determine the cause of the malfunction.

PROCEDURE


  1. CHECK THE VEHICLE TYPE

    Result
    Result Proceed to
    w/ Power back door system A
    w/o Power back door system B

    B

    GO TO DTC CHART (U1002) Click here

    A

  2. CHECK FOR DTC


    1. Check for DTC.

      Tech Tips

      If the CAN MS bus communication error DTC U1002 is output, troubleshoot for U1002 and check for malfunctions in the CAN MS main bus circuit Click here.

      Result
      Result Proceed to
      U1002 is not output A
      U1002 is output B

    B

    GO TO DTC CHART (U1002) Click here

    A

  3. CHECK CAN MS BUS WIRE (CERTIFICATION ECU)


    1. Turn the ignition switch off.

    2. A017BXQE08

      Disconnect the connector from the certification ECU.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      D36-27 (CANH) - D36-28 (CANL) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MS BUS BRANCH WIRE OR CONNECTOR (CERTIFICATION ECU)

    OK

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A017BXQE09

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

      Standard resistance
      Tester Connection Condition Specified Condition
      D36-17 (E) - Body ground Always Below 1 Ω

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

      Standard voltage
      Tester Connection Condition Specified Condition
      D36-18 (IG) - Body ground Ignition switch on (IG) 10 to 14 V
      D36-1 (+B) - Body ground Always 10 to 14 V
      D36-19 (ACC) - Body ground Ignition switch on (ACC) 10 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE CERTIFICATION ECU