|DTC Code||DTC Name|
|U1103||Lost Communication with Stop and Start Control Module|
The ECM and engine stop and start ECU communicate with each other via CAN communication. The engine stop and start ECU also communicates with other computers through the ECM. If there is a problem with this communication, the ECM illuminates the MIL and stores this DTC.
|DTC No.||Detection Item||DTC Detection Condition||Trouble Area||MIL||Memory|
|U1103||Lost Communication with Stop and Start Control Module||No communication between ECM and engine stop and start ECU (1 trip detection logic).||
|DTC No.||DTC Detection Drive Pattern|
|U1103||Ignition switch ON|
|*a||Engine Stop and Start ECU|
|*b||CAN Communication Line|
CAUTION / NOTICE / HINT
When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system first.
Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
If the CAN communication system is malfunctioning, there is no data output from the ECM. In this case, some of the freeze frame data will not be correct and not identical with the ECM data, but the ECM data are correct.
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC U1103)
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Enter the following menus: System Select / Health Check.
Read the DTCs.
If any DTCs other than U1103 are output, troubleshoot those DTCs first.
GO TO CAN COMMUNICATION SYSTEM FOR TROUBLESHOOTING Click hereНажмите здесь
GO TO DTC CHART