KIA Niro: Electric Power Steering / 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.

(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.

(3) Check the motor connector.

• Terminal Expansion and damage

Warning

Must be replaced the MDPS motor if occur terminal expansion and damage.

(4) Check the motor wiring.

Warning

Must be replaced the MDPS motor if occur damage or problem.

Remove the grommet (A) and then check the wiring on the TAS side (B) and ECU side (C).

• Check for damage, push-back, or improper connection in each connector and wiring.

Warning

Must be replaced the MDPS assembly if occur damage or problem.

Check the TAS wiring in case of C1259/C1290 DTC.

2 - 2 Inspection Items per DTC

3. MDPS Performance Inspection

1. Inspect steering angle and DTCs relevant to the steering system.
2. Inspection for heavy steering effort

(1) Inspect tire pressure and width.

(2) Check DTCs relevant to the CAN communication error.

(3) Check the wheel alignment.

4. MDPS common problems

Case 1

• Steering shaft noise
• Replace steering shaft

Case 2

• Clock spring noise
• Replace clock spring

Case 3

• DAB / Wire noise
• Rearrange and replace DAB

Case 4

• Multifunction switch noise
• Replace multifunction switch

Case 5

• MB nut mount defect
• Retighten nut

Case 6

• M10 nut mount defect
• Retighten nut

Case 7

• Cowl top bolt mount defect
• Retighten cowl top bolt

Case 8

• Cowl bar nut mount defect
• Replace clock spring

Warning

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.

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