MDPS (Motor Driven Power Steering) system uses an electric motor to assist the
steering force and it is an engine operation independent steering system.
MDPS control module controls the motor operation according to information received
from the each sensor and CAN (Controller Area Network), resulting in a more
precise and timely control of steering assist than conventional engine-driven
hydraulic systems.
Components (Torque Sensor, Fail-safe relay, etc.) of the MDPS system are located
inside the steering column & MDPS unit assembly and the steering column & MDPS
unit assembly must not be disassemble to inspect or replace them.
Trouble factor
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Check item
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Trouble symtom
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Explanation
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Note
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Drop, impact, and overload
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Motor
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Abnormal noise
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Visable or unvisable damage can occur.The steering wheel could
pull to one side by using the dropped parts.
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Precise parts of motor/ECU are sensitive to vibration and impact.
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| – |
Overload can cause unexpected damage
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Do not use the impacted MDPS.
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Do not overload each parts.
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ECU
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Circuit damage
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Torque sensor
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Insufficient steering effort
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Overload to INPUT shaft can cause malfunction of the torque sensor
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| – |
Do not impact the connecting parts (When inserting and torquing)
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Use the specified tool to remove the steering wheel. (Do not
hammer on it)
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Do not use the impacted MDPS
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Shaft
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Insufficient steering effort (Uneven between LH and RH)
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Do not use the impacted MDPS
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Pull / Dent
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Harness
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Malfunction-impossible power operation
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Disconnection between harness connecting portion and harness
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Do not overload the harness
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Abnormal storage temperature
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Motor/ECU
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Abnormal steering effort by improper operation of the motor/ECU
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Waterproof at the normal condition
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Even a little moisture can cause malfunction of the precise
parts of the motor/ECU
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Keep the normal temperature and proper moisture, while storaging
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