Hyundai Accent: Motor Driven Power Steering / Description and Operation
- Description
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.
- Operation
Note With Regard to diagnosis
| Trouble factor | Check item | Trouble symtom | Explanation | Note |
| Drop, impact, and overload | Motor | Abnormal noise | | – | Visable or unvisable damage can occur.The steering wheel could pull to one side by using the dropped parts. |
| – | Precise parts of motor/ECU are sensitive to vibration and impact. |
| – | Overload can cause unexpected damage |
| | – | Do not use the impacted MDPS. |
| – | Do not overload each parts. |
|
| ECU | Circuit damage
|
| Torque sensor | Insufficient steering effort | Overload to INPUT shaft can cause malfunction of the torque sensor | | – | Do not impact the connecting parts (When inserting and torquing) |
| – | Use the specified tool to remove the steering wheel. (Do not hammer on it) |
| – | Do not use the impacted MDPS |
|
| Shaft | Insufficient steering effort (Uneven between LH and RH) | | Do not use the impacted MDPS |
| Pull/Dent | Harness | | – | Malfunction-impossible power operation |
| Disconnection between harness connecting portion and harness | Do not overload the harness |
| Abnormal storage temperature | Motor/ECU | Abnormal steering effort by improper operation of the motor/ECU | | – | Waterproof at the normal condition |
| – | Even a little moisture can cause malfunction of the precise parts of the motor/ECU |
| | – | Keep the normal temperature and proper moisture, while storaging |
|
Other information:
Hyundai Accent (HC) (2017 - 2022) Service Manual: Heater & A/C Control Unit (FATC)
- Components
ConnectorPin NOFunctionConnectorPin NOFunction
A1Battery (+)A21IGN2
2ADS Sensor (PWM)22IGN1
3ILL+ (TAIL)23HTD (Rear defog indicator)
4C_CAN High24PAB off signal
5C_CAN Low25PAB IGN1
6Defrost actuator (Open)26Sensor ground REF (+5V)
7Defrost actuator (Close)27Detent out (-)
8Mode control actuator (Vent)28Ambient Temperature Sensor (+)
9Mode control actuator (Def)29Evaporator Temperature Sensor (+)
10Temperature control actuator (Cool)30Photo sensor (-)
11Temperature control actuator (Warm)31-
12Intake actuator (Fresh)32-
13Intake actuator (Recirculation)33Hazard signal
14Mode control actuator (Feedback)34Rear defog swich
15Tmperature control actuator (Feedback)35-
16Intake actuator (Feedback)36Blower motor (+)
17Defrost actuator (Feedback)37Fet (Drain feedback)
18ECV+38Fet (Gate)
19ECV- (Ground)39Sensor ground
20ILL- (RHEO)40Ground
- Self Diagnosis
1.
Hyundai Accent (HC) (2017 - 2022) Service Manual: Repair procedures
- A/S Repair produres
MDPS System A/S Workflow
① Noise / malfunction Inspection
② Warning lamp (DTC) / CAN Line error
2 - 1 Checking Connectors and Wiring
1.Checking Connectors and Wiring.Check for damage, push-back, or improper connection in each connector and wiring.(1)Check the wiring on the vehicle side. – Check for open / short - circuit due to faulty connection, damage, or foreign substance.
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