The HECU sends requirement data, such as torque reduction, the number of fuel cut cylinders, and the ESP control request, to the PCM(ECM & TCM) through CAN bus line. The PCM(ECM) performs the fuel cut function according to a request signal from the HECU and then retards an ignition timing. The PCM(TCM) maintains current gear position during the ESP control period in order not to increase power which causes a Kickdown shift.
The HECU checks the CAN communcation lines for normal ESP control, and sets this code if an ECM message is not received within 500ms.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
CAN message monitoring | 1. Faulty ECM 2. Open or short in CAN communication line 3. Poor connection |
Enable Conditions |
•
In case that EMS1 or EMS2 message was not received for more than 500ms within normal voltage condition. | |
Fail Safe |
•
Inhibit the ESP/DBC control and allow the ABS/EBD control.
•
The ESP/DBC warning lamp is activated. |
