CAN COMMUNICATION SYSTEM, Diagnostic DTC:U1110

DTC Code DTC Name
U1110 Lost Communication with Clearance Sonar Module

DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area Note
U1110 Lost Communication with Clearance Sonar Module No communication from the clearance warning ECU assembly continues.

  • Clearance warning ECU assembly branch line or connector

  • Power source circuit of clearance warning ECU assembly

  • Clearance warning ECU assembly ground circuit

  • Clearance warning ECU assembly

Tech Tips

The power management control ECU stores DTCs when it detects a communication stop or network communication error for ECUs connected to sub bus 11.

Tech Tips

This diagnosis procedure is for when DTC U1110 is output by the power management control ECU (GTS display: PM1 Gateway).

WIRING DIAGRAM

A01G3OFE02

CAUTION / NOTICE / HINT

Note


  • Before measuring the resistance of the CAN bus, turn the power 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 (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

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

    Click here

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

  • DTC check procedure: Turn the power switch on (IG) and wait at least 16.08 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.

    Click here

Tech Tips


  • Operating the power 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.

      Tech Tips

      If DTC U1002 is output from PM1 Gateway of the power management control ECU, this indicates a sub bus 11 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 11.


      Body Electrical > PM1 Gateway > Trouble Codes
      Result
      Result Proceed to

      U1002 is not output from power management control ECU.

      (GTS display: PM1 Gateway)

      		 A

      U1002 is output from power management control ECU.

      (GTS display: PM1 Gateway)

      		 B

    B

    GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC Click here

    A

  2. CHECK FOR OPEN IN CAN BUS LINES (CLEARANCE WARNING ECU ASSEMBLY BRANCH LINE)


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

    2. Disconnect the E98 clearance warning ECU assembly connector.

    3. A01G39GC13
      *a

      Front view of wire harness connector

      (to Clearance Warning ECU Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E98-29 (R1) - E98-28 (R2) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Result
      Result
      OK
      NG

    NG

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY)

    OK

  3. CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT)


    1. A01G39GC15
      *a

      Front view of wire harness connector

      (to Clearance Warning ECU Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E98-16 (E) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      Result
      Result
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

    OK

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. Connect the cable to the negative (-) auxiliary battery terminal.

    2. A01G39GC16
      *a

      Front view of wire harness connector

      (to Clearance Warning ECU Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E98-18 (IG) - Body ground Power switch on (IG) 11 to 14 V
      Result
      Result
      OK
      NG

    OK

    REPLACE CLEARANCE WARNING ECU ASSEMBLY REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here for LHD: Click here for RHD: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)