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 communcation lines for normal TCS control, and sets this code if an ECM message is not received within predefined time.
Item
Detecting Condition
Possible cause
DTC Strategy
? CAN massage monitoring
? Faulty EMS
? Faulty HECU
Monitoring Period
? Continuous
Enable Conditions
? Faults are detected if EMS message was not received on time by the CAN controller of HECU.
Fail Safe
? Inhibit the ESP control and allow the ABS/EBD control.
Meanwhile, stop checking the ESP switch failure under the ESP control.