CAN COMMUNICATION SYSTEM, Diagnostic DTC:U1122

DTC Code DTC Name
U1122 Lost Communication with EGR Valve

DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
U1122 There is no communication from the EGR valve assembly.

  • Power source or inside of EGR valve assembly

  • EGR valve assembly CAN branch wire or connector

  • EGR valve assembly

WIRING DIAGRAM

A01CJ1SE03

INSPECTION PROCEDURE

Tech Tips

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE


  1. PRECAUTION

    Note

    After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.


    NEXT

  2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


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

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the airbag system.

      Note

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


    NEXT

  3. CHECK FOR OPEN IN CAN BUS WIRE (EGR VALVE ASSEMBLY CAN BRANCH WIRE)


    1. A01CJCIE06
      Text in Illustration
      *a

      Front view of wire harness connector

      (to EGR Valve Assembly)

      Disconnect the EGR valve assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E31-5 (CANH) - E31-2 (CANL) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE EGR VALVE ASSEMBLY CAN BRANCH WIRE OR CONNECTOR (CANH, CANL)

    OK

  4. CHECK HARNESS AND CONNECTOR (EGR VALVE ASSEMBLY - BATTERY AND BODY GROUND)


    1. A01CJCIE07
      Text in Illustration
      *a

      Front view of wire harness connector

      (to EGR Valve Assembly)

      Connect 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
      E31-1 (E) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E31-4 (+B) - Body ground Ignition switch ON 20 to 28 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE EGR VALVE ASSEMBLY Click here