Hyundai Santa Fe: Motor Driven Power Steering / Repair procedures

Hyundai Santa Fe (TM) 2019-2024 Service Manual / Steering System / Motor Driven Power Steering / Repair procedures

A/S Repair produres [C-MDPS]
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

  
•
Must be replaced the MDPS motor if occur terminal expansion and damage.
(4)
Check the motor wiring.

  
•
Must be replaced the MDPS motor if occur damage or problem.
(5)
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.

  
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
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.
In case of reoccurrence, replace 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
 IIn case of reoccurrence, replace motor.
C2401
 Motor circuit error
C2412
 Motor voltage supply error
 First erase DTC and check, Check ECU/motor connector.
 First replace ECU. 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
 1. Check G-SCAN condition.
2. Check connector connection.
3. Check ECU CAN line.
4. 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).
C1623,C1687,C1688
 Can time out Steering angle sensor
1. Check MDPS Power Connector & FUSE
2. Check MDPS Ground line
3. Check MDPS ECU / VSM CAN line
4. Communication status with diagnostic tool
 In case of reoccurrence, replace ECU
(Heavy steering and no communication)

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
Case 2
Case 3

U-Joint noise
 Clock spring noise
 DAB / Wire noise
Retighten the bolt
 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

  
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.
A/S Repair Procedures [R-MDPS]
Column & Housing Noise Repair Guide

R-MDPS Warning lamp Diagnosis Guide

Inspection Items per DTC
NO
DTC
Problem
Items to check
1
 C110117
 High battery voltage
 1. Generator
2. Battery
3. MDPS ECU
2
 C110216
 Low battery voltage
 1. Generator
2. Battery
3. MDPS ECU
3
 C110921
 IG1 voltage error
 1. Generator
2. IGN Line
3.MDPS ECU
4
 C111201
 Torque sensor supply voltage error
 1. MDPS ECU
5
 C120286
Wheel speed sensor signal error
1. CAN Line
C120586
 2. MDPS ECU
C120886
 3. Wheel sensor line
C121186
6
 C125901
 Steering angle circuit error
 1. MDPS ECU
C125929
C125938
7
 C126154
 Steering angle sensor zero point error
 1. Whether to initialize steering angle
2. Battery
8
 C126204
 Temperature sensor error
 1. Temperature sensor
(MDPS ECU)
9
 C129002
 Torque sensor main signal error
1. Main torque sensor
2. Torque sensor connector
10
 C16034B
 Out put descent (Prevent overheating)
 1. MDPS ECU
11
 C160404
 ECU hardware error
 1. MDPS ECU
12
 C160604
 MDPS ECU software error
 1. MDPS ECU
13
 C161187
 ECU CAN communication response delay
 1. Check engine ECU CAN line  
2. Check CAN Line
14
 C161386
 ECU CAN communication signal error
 1. Check engine ECU CAN line  
2. Check CAN Line
15
 C161487
 HCU CAN communication response delay
 1. Check engine ECU CAN line  
2. Check CAN Line
16
 C161688
 CAN BUS error
 1. Check CAN Line
17
 C161C86
 HCU CAN communication signal error
 1. Check engine ECU CAN line  
2. Check CAN Line
18
 C162887
 CLU CAN communication response delay
 1. CAN Line
2. MDPS ECU
3. Cluster
19
 C162986
 CLU CAN  communication signal error
 1. CAN Line
2. MDPS ECU
3. Cluster
20
 C163386
 CLU CAN communication signal error
 1. CAN Line
2. MDPS ECU
3. Cluster
21
 C165987
 CAN SAS signal not entered
 1. SAS Delivery UNIT
2. CAN Line
22
 C169287
 VSM CAN signal not entered
 1. CAN Line
2. MDPS ECU
3. BCM (IPM)
23
 C169386
 VSM CAN signal error
 1. CAN Line
2. MDPS ECU
3. BCM (IPM)
24
 C169687
 PA CAN signal not entered
 1. CAN Line
2. MDPS ECU
3. SPAS ECU
25
 C169786
 PA CAN signal error
 1. CAN Line
2. MDPS ECU
3. SPAS ECU
26
 C170004
 Specification recognition not applied (BYTE)
 1. MDPS ECU
27
 C170255
 Specification recognition not applied (Variant)
 1. Select regional specifications
28
 C170401
 ECU safety relay error
 1. MDPS ECU
29
 C170504
 ECU spare charge circuit error
 1. Motor relay
2. MDPS ECU
30
 C171101
 Abnormal power OFF accumulate
 1. Generator
2. Battery
3. MDPS ECU
31
 C180487
 LKAS CAN signal not entered
 1. CAN Line
2. MDPS ECU
3. LKAS ECU
32
 C180586
 LKAS CAN signal error
 1. CAN Line
2. MDPS ECU
3. LKAS ECU
33
 C181483
 CAN SAS signal error
 1. SAS Delivery UNIT
C181486
 1. CAN Line
34
 C240162
 Motor circuit error
 1. Motor location sensor
2. Motor connector
35
 C241216
 Motor short/break
 1. Motor     
C241262
 2. Motor connector
36
 C186687
 ICSC CAN Not received
 1. ICSC (Integrated controller)
37
 C166B87
 Wheel speed sensor signal Not received
 1. Wheel speed sensor
2. CAN Line
38
 C16B286
 Wheel speed sensor signal error
 1. Wheel speed sensor
2. CAN Line
39
 C16BF64
 Wheel speed sensor monitoring error
 1. Wheel speed sensor
2. CAN Line
40
 C241319
 Motor current error
 1. Motor current sensor
C241328
C241396

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.

Classification
Pin no
Pin name
MDPS Power
 1
 Battery (-)
2
 Battery (+)
MDPS Unit
 1
 -
2
 -
3
 IG 1
4
 C-CAN [High]
5
 C-CAN [Low]
6
 -

  
The following phenomena are not malfunctions when the MDPS warning lamp is not lit.
•
There is no auxiliary steering force temporarily during the MDPS system self-diagnosis time (about 2 seconds) immediately after the engine starts, but this is not a malfunction.
•
There is noise due to relay connection when the engine is on or off, but this is a normal operation sound.
•
There is noise caused by motor rotation when operating the steering wheel in a stationary or low-speed driving state, but this is a normal operating sound.
MDPS(Motor Driven Power Steering) Handling precautions
1.
A failure may occur due to the internal damage when a new partial part is dropped, impacted or excessive external load is applied.
→ If a partial part is impacted or is dropped, replace it with a new part.
2.
If excessive impact is applied when assembling the steering wheel, center point of the torque sensor may be warped.
→ Caution is needed when tightening by excessive impact.
3.
Be careful for the damage to the wiring due to deformation, when detaching/attaching the contactor or excessive external force is applied.
→ Excessive insertion of the connector or using after removal is prohibited.
4.
Caution is needed for partial part storage and replacement work under abnormal condition of the temperature and humidity.

    Schematic diagrams

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