The HECU send requirement data, such as Torque reduction, the number of fuel cut cylinders, and ESP 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 ESP control time, 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 a PCM(ECM) message is not received within predefined time.
Item
Detecting Condition
Possible Cause
DTC Strategy
CAN message monitoring
Faulty PCM(ECM)
Faulty HECU
Monitoring Period
Continuous
Enable Conditions
Faults are detected if PCM(ECM) message was not received on time by the CAN controller of HECU.
Fail-Safe
Inhibit the ESP control and allow the ABS/EBD control.