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 control module for normal ESP control, and sets this code if CAN control module malfunction is detected.
Item
Detecting Condition
Possible Cause
DTC Strategy
CAN control module monitoring
Faulty HECU
Monitoring Period
Immediate during start up
Enable Conditions
Faults are detected immediately if the initialization software can't have write access to the configuration registers of the CAN-controller module.
Fail-Safe
Inhibit the ESP control and allow the ABS/EBD control.