The HECU send requirement data, such as Torque reduction, the number of fuel cut cylinders, and TCS control requests, to the Engine ECU & TCU through CAN bus line. The Engine ECU performs fuel cut functions according to requests from the HECU and retards ignition timing by torque reduction requests. The TCU maintains current gear positions during TCS control time, in order not to increase power which causes a Kickdown shift.
The HECU checks the CAN communication lines for normal ESP control, and sets this code if re-initialization is tried for 15 times in sequence without success.
Item
Detecting Condition
Possible cause
DTC Strategy
Open or short monitoring
Open or short circuit in CAN line
Monitoring Period
Continuous
Enable Conditions
A CAN BUS off fault is established if re-initialization is tried for 15 times in sequence without success.
Fail Safe
Inhibit the ESP control and allow the ABS/EBD control.
Meanwhile, stop checking the ESP switch failure under the ESP control.