EPS CM controls EPS solenoid current accurately according to vehicle speed. 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 CM sets this code and turns on warning lamp if excessive low voltage caused by faulty alternator or poor connention in power supply circuit is detected.
Item
Detecting Condition
Possible cause
DTC strategy
Battery Voltage Monitoring
Open/short in power.
Contact resistance in connections.
Poor contact of fail-safe relay.
Faulty charging system.
Low idle rpm.
Loose alternator belt tension.
Enable conditions
Engine "ON"
Threshold value
Fail-safe relay contact voltage < 9 V
Fail Safe
EPS warning lamp "ON"
Restoration conditions
Motor : Current decrease 45A / 2.9sec
Relay : ON
Fail lamp : ON
Restoration condition : Fail-safe relay voltage = 10 V
Bat. Voltage
IG Key ON
ENG. ON
Approx. 11.8 [V] ~ 12.5 [V]
Approx. 12.5 [V] ~ 14.5 [V]