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

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		IIn case of reoccurrence, replace motor.
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.

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

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 (-)
MDPS Power	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.

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