Goes Cobalt - EPS Fault Diagnosis and Solution

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No.
Failure Phenomenon
Probable Reason
Troubleshooting
Steering without
assistance
Power don’t weighs
the same for left and
right
when system is on,
the steering wheel
swings on both sides
Steering becomes
heavy
System has noise
1、connectors of wire is bad contact
2、The fuse blew out
3、Relay damage
4、The controller、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
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
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
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
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
1、The median output voltage have
deviation
2、controller、motor or sensor is
damaged
EPS fault diagnosis and solution
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