Vehicle Issue Diagnosis
174
EPS fault diagnosis and solution
No
Failure
Phenomenon
Probable Reason
Troubleshooting
1
S t e e r i n g w i t h o u t
assistance
1.Connectors of wire is bad contact
2.The fuse blew out
3.Relay damage
4.Thecontroller,motor or sensor is damaged
1.Check whether wire connectors are fully
inserted
2.Replace the fuse(30A)
3.Replace the relay
4.Contact with suppliers and replace it
2
Power don’t weighs the
same for left and right
1.The median output voltage have deviation
2.Controller,motor or sensor is damaged
1.Disconnect motor connectors,loosen the
sensor adjustment screw,adjust the sensor
position to keep the voltage in 1.65V±0.05V
2.Contact with suppliers and replace it
3
when system is on, the
steering wheel swings
on both sides
1.Motor is mounted backwards
2.Controller or sensor is damaged
1.Exchange the position of ( thick line) red line
and black line at the motor terminal 2.Contact
with suppliers and replace it
4
Steering becomes
heavy
1.Battery have power loss
2.Motor damage (power reduction)
3.air pressure of the tires (front) is insufficient.
1.Charge
2.Contact with suppliers and replace it
3.Inflate tires
5
System has noise
1.Motor damage
2.Gap of lower steering shaft assembly or
mechanical steering assembly is too large
3.Installation of lower steering shaft assembly or
mechanical steering assembly is unfirm
1.Replace
2.Replace
3.Check whether the installation screw is tight,
reinforcement