CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM, Diagnostic DTC:U1103

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

DESCRIPTION

The ECM and engine stop and start ECU send and receive signals via CAN communication.

If a communication error occurs between the ECM and engine stop and start ECU, the ECM stores this DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
U1103 Lost Communication with Stop and Start Control Module

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other


  1. The ignition switch is ON.

  2. There is no communication between the ECM and engine stop and start ECU.

  3. 1.25 seconds or more

  4. 1-trip detection logic

  • ECM

  • Engine Stop and Start ECU

  • CAN Communication System

 Does not come on DTC stored

PROCEDURE


  1. CLEAR DTC AND PERFORM ROAD TEST


    1. Clear the DTCs.

      Click here


      Powertrain > Engine and ECT > Clear DTCs

      Tech Tips

      Write down the currently output DTCs before clearing them.

    2. Start the engine and drive the vehicle at a low speed.

      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK DTC OUTPUT (DTC U1103)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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


      Powertrain > Engine and ECT > Trouble Codes

    5. Read the DTCs using the GTS.

      Result
      Result Proceed to
      DTC U1103 is not output A
      DTC U1103 is output B

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    GO TO CAN COMMUNICATION SYSTEM for LHD: Click here for RHD: Click here