MDPS System A/S Workflow

Fig 1: A/S Workflow

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Noise / malfunction Inspection

Fig 2: Noise / Malfunction Inspection
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Warning lamp (DTC) / CAN Line error

2 - 1 Checking Connectors and Wiring

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.
  
  Fig 3: Battery and Vehicle Signal Connector
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2. Check the wiring on the ECU side (motor 3 - phase power).
  - Check for open / short - circuit due to faulty connection, damage, or foreign substance.
  
  Fig 4: ECU Side (motor 3 - Phase Power).
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3. Check the motor connector.
  - Terminal Expansion and damage
  
  Fig 5: Motor Connector
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  NOTE: * Must be replaced the MDPS motor if occur terminal expansion and damage.
4. Check the motor wiring.
  
  Fig 6: Motor Wiring
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  NOTE: * Must be replaced the MDPS motor if occur damage or problem.

2 - 2 Inspection Items per DTC

DTC	Problem	First analysis method	How to repair
C1290	Torque sensor signal error	First erase DTC, check connector connection.	In case of reoccurrence, replace column & housing.
C1112	Torque sensor voltage error	Check connector between torque sensor and ECU.
C1705	ECU hardware error	First erase DTC and then check, check ECU connector.
C1604	ECU over/discharge error
C2413	ECU hardware error
C2400	Motor signal error		In case of reoccurrence, replace ECU.
C2401	Motor circuit error		In case of reoccurrence, replace ECU.
C2412	Motor voltage supply error	First erase DTC and check, Check ECU/motor connector.	In case of reoccurrence, replace motor.
C1259	Angle sensor signal error	After Resetting zero point & erasing DTC, check connector connection condition.	In case of reoccurrence, replace column & Housing.
C1261	Zero-setting error	After Resetting zero point, recheck.	Reset the zero-setting.
C1102	Battery voltage problem	Check battery voltage condition.	Recharge battery voltage.
C1696, C1697	SPAS signal error	Check SPAS.	Erase DTC (MDPS is not to be replaced).
C1612, C1646	TCU signal error	Check TCU.
C1628, C1656	Instrument cluster signal error	Check instrument cluster.
C1692, C1693	VSM signal error	Check VSM.
C1260	Angle sensor signal error	After resetting the angle, recheck. If C1259 does not occur, check CAN line.	Reset Angle sensor. Erase DTC.
C1611	CAN time out EMS	Check G-SCAN condition. Check connector connection Check ECU CAN line Check MDPS ground line	Check the EMS CAN Line.
C1616	CAN BUS OFF		Check the chassis CAN Line.
C1622	Vehicle speed signal error		Check the EMS (Engine ECU).

MDPS Performance Inspection

- This bulletin provides Motor Driven Power Steering (MDPS) diagnostic procedure using GDS to diagnose the heavy steering effort, abnormal position of steering parts and MIL illumination in steering system.

- GDS judges the MDPS normal / abnormal state by calculating the MDPS motor torque generated when turning the steering wheel to left and right at 360° per 3 seconds.

Fig 7: GDS Judges The MDPS

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Connect self - diagnosis connector (16 pins) located in the lower of driver side crash pad to self - diagnosis device.
Turn the self - diagnosis device after key is ON.
After Selecting the "vehicle model" and "system", select the "MDPS TEST" on GDS vehicle selection screen.

Fig 8: "MDPS TEST" On GDS Vehicle Selection Screen
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Prepare a vehicle according to the required vehicle's conditions.

Fig 9: Prepare Vehicle According To Required Vehicle'S Conditions
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Search the DTCs relevant to the MDPS and then erase them if found.

Fig 10: Search DTCs Relevant To MDPS
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Perform the MDPS TEST.

Fig 11: Perform the MDPS TEST
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If the results of MDPS performance inspection are "OK", click "OK" and then finish the service work.

Fig 12: MDPS Performance Inspection
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If the results of MDPS inspection are "Check", click "Inspection" and then inspect below items.

MDPS Warning light illuminated

Fig 13: MDPS Warning light illuminated
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- Inspect DTCs relevant to the steering system.
Vibration and Noise
- Inspect MDPS portions where are mounted to the body. (Checking tightening conditions of bolts and nuts)

- Inspect universal joint mounting bolts.

Inspection for heavy steering effort

- Inspect tire pressure and width.

- Check that the heavy steering effort occurs or not when vehicle speed is not received.

- Check DTCs relevant to the CAN communication error.

DTC	Type	Service action
C1611, C1616, C1622 C1692, C1628, C1693 C1614, C1969, C1697 C1812, C1817	DTCs relevant to the CAN communication	- Conduct diagnosis if DTCs do not recur after erasing DTCs - Inspect CAN line if DTCs recur after erasing DTCs.

MDPS common problems

Case 1	Case 2	Case 3

Multifunction switch noise	Clock spring noise	DAB / Wire noise
Replace multifunction switch	Replace clock spring	Rearrange and replace DAB

Case 4	Case 5	Case 6

Multifunction switch noise	MB nut mount defect	M10 nut mount defect
Replace multifunction switch	Retighten nut	Retighten nut

Case 7	Case 8

Cowl top bolt mount defect	Cowl bar nut mount defect
Retighten cowl top bolt	Replace clock spring

CAUTION:

Cautions to be taken when handling the MDPS (Motor Driven Power Steering)

Failure occurs due to internal damage because of the drop of and shock and excessive external force on the new partial component.
→ Be cautious of shock on the partial component and replace the damaged part (due to drop, etc.) with a new one.
When fastening the steering, excessive impact may result in twisting the center point of the torque sensor.
When removing/installing the connector the wiring may be damaged (deformed) by excessive external force.
Be cautious when storing and replacing the partial components under the abnormal temperature and humidity conditions.