SFI SYSTEM, Diagnostic DTC:U1103

DTC Code DTC Name
U1103 Lost Communication with Stop and Start Control Module

DESCRIPTION

The engine stop and start computer and ECM perform 2-way communication with each other via the Controller Area Network (CAN). If the engine stop and start computer cannot communicate with the ECM, the engine stop and start computer will conclude that there is a malfunction in the CAN system, illuminate the MIL and set a DTC.

DTC No. DTC Detection Condition Trouble Area
U1103 No communication between ECM and engine stop and start computer

  • ECM to engine stop and start computer circuit

  • ECM

  • CAN communication system

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC U1103)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / DTC.

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC U1103 is output A
      DTC U1103 and other DTCs are output B

      Tech Tips

      If any DTCs other than U1103 are output, troubleshoot those DTCs first.


    A

    GO TO CAN COMMUNICATION SYSTEM Click here

    B

    GO TO DTC CHART Click here