There is no hardware difference of the HECU according to the vehicle’s specification, just software is changed by the vehicle parameter used for ESP control. The HECU stores a classified varient code value according to the received data(a kind of engine, engine displacement, a kind of T/M). After then the HECU read a various parameter according to the stored varient value in the memory to use for the ESP control.
The HECU checks the varient code after ignition. If a inappropriate varient code is detected or there is no varient code, a fault is detected.
Item
Detecting Condition
Possible cause
DTC Strategy
? Internal monitoring
? Faulty HECU
? Replacement of EMS, T/M ECU
Monitoring Period
? Once during startup.
Enable Conditions
? During intialization, there is no inputed valid varient code.
? The EEPROM didn’t have variant coed.
? Receieved variant code is invalid.
? There is a difference between pre-inputted variant code and re-inputted variant code.
Fail Safe
? The ABS/EBD/ESP functions are inhibited.
? The ABS/EBD/ESP warning lamps are activated.