The HECU send requirement data, such as Torque reduction, the number of fuel cut cylinders, and VDC control requests, to the Engine PCM(ECM & TCM) through CAN bus line.
The Engine PCM(ECM) performs fuel cut functions according to requests from the HECU and retards ignition timing by torque reduction requests.
The PCM(TCM) maintains current gear positions during VDC control time, in order not to increase power which causes a Kickdown shift.
The HECU checks the CAN communication lines for normal TCS control, and sets this code if CAN BUS OFF status is detected for more than 100ms.
Item
Detecting Condition
Possible cause
DTC Strategy
? Open or short circuit monitoring
? Open or short circuit in CAN line
? Faulty HECU
Enable Conditions
? In case CAN BUS off state continued for more than 100ms.
Fail Safe
? Inhibit the VDC control and allow the ABS/EBD control.
? The VDC warning lamp is activated.