The HECU is composed of a ECU (Electronic Control Unit ) and a HCU( Hydraulic Control Unit) , so the HECU hardware includes all solenoid valves inside the unit as well as the ECU.
The HECU monitors the operation of the IC components such as memory, register, A/D converter and so on. The HECU sets this code when the EEPROM data read by the master processor is different than prior data writed, or when the master/slave processor detects abnormal operation in RAM, Status Register, Interrupt, Timer, A/D converter or cycle time.
Item | Detecting Condition | Possible cause |
DTC Strategy | ● Internal monitoring | ● Faulty HECU |
Monitoring Period | ● Continuous | |
Enable Conditions | ● After the master processor writes the pre-defined data to EEPROM, read the data and compare each other.If they differ from each other. ● If the master/slave processor detects abnormal operation in RAM, status register, interrupt, timer, A/D converter and cycle time. - The control unit is continuously monitored for proper operation. | |
Fail Safe | ● No ABS control. ABS is switched off immediately. - The ABS and the EBD warning lamps are activated. |
