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
System power ON
Threshold value
Engine RPM > 525 & Ignition voltage is continuously low for more than 4 seconds
Fail Safe
EPS warning lamp "ON"
Restoration conditions
IG On.