CAN COMMUNICATION SYSTEM, Diagnostic DTC:U0327

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

DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
U0327 No communication from certification ECU (smart key ECU assembly) continues.

  • Power source circuit of the certification ECU (smart key ECU assembly)

  • Certification ECU (Smart key ECU assembly) branch wire or connector

  • Certification ECU (Smart key ECU assembly)

WIRING DIAGRAM

A01CC0ZE02
A01CFYCE01

INSPECTION PROCEDURE

Note


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

  • After the engine 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 engine switch, any other switches or doors. If any doors need to be opened in order to check the connectors, open the doors and leave them open.

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 will help determine the cause of the malfunction.

PROCEDURE


  1. CHECK FOR DTC


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Check for DTCs Click here.

      Tech Tips

      If the CAN MS bus communication DTC U1002 (Lost Communication with Gateway Module (Main body ECU)) is output, perform troubleshooting for U1002 and check for malfunctions in the CAN MS bus.

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

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

  2. CHECK CAN BUS WIRE FOR DISCONNECTION (CERTIFICATION ECU BRANCH WIRE)


    1. A01CB15E01

      Turn the engine switch off.

    2. Disconnect the connector of the certification ECU (smart key ECU assembly).

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G20-27 (CANH) - G20-28 (CANL) Engine switch off 54 to 69 Ω

    NG

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

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)


    1. A01CB15E02

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G20-1 (+B) - Body ground Always 11 to 14 V
      G20-19 (ACC) - Body ground Engine switch on (ACC) 11 to 14 V
      G20-18 (IG) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  4. CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)


    1. A01CB15E04

      Turn the engine switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G20-17 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)