EPS CM receives vehicle speed and engine RPM signal from EMS(Engine Management System) via CAN line and controls motor current accurately according to driver's steering intention. EPS CM monitors that operating voltage supplied as IG S/W is too high or too low on "power supply terminal". If excessive high voltage or low voltage is detected, EPS CM stops current supply to solenoid to prevent unexpected operation or damage.
EPS is designed to operate only at engine "ON" because it's current attrition rate is high. It decides whether engine operates or not from vehicle speed and engine RPM. EPS CM sets this code and turns on warning lamp if IG S/W turns off when engine is operating.
Item
Detecting Condition
Possible cause
DTC Strategy
? Voltage Monitoring
? Faulty ground circuit
? Poor connection in ground circuit
? Open in IG circuit
Enable conditions
? Engine RPM > 500 & Vehicle speed > 2.7Km/h
Threshold value
? IG S/W Off
Fail Safe
? EPS warning lamp "ON"(Back up function maintained for 310sec)
Restoration conditions
? IG On