Kia Picanto: Steering System / Motor Driven Power Steering

Kia Picanto JA 2017-2025 Service & Repair Manual / Steering System / 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 (Steering Angle Sensor, Torque Sensor, Fail-safe relay, etc.) of the MDPS system are located inside the steering column. MDPS unit assembly, steering column, and MDPS unit assembly must not be disassembled for inspection. They must be replaced if necessary.

Components and components location

Components

1. Steering column
2. Universal joint

3. MDPS motor
4. MDPS ECU

Schematic diagrams

Schematic Diagrams

Harness Connector

Type	Pin No	Description
Battery	1	Battery +
Battery	2	Battery -
VSS	1	IGN
	2	-
	3	-
	4	-
	5	-
	6	-
	7	HIGH CAN
	8	LOW CAN

Repair procedures

A/S Repair produres

MDPS System A/S Workflow

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.

② Inspection Items per DTC

Item	DTC	Description	Inspection	Service action
CAN Line	C1611	CAN TIME OUT EMS	1. Check the GDS 2. Check connector tightening. 3. Inspection the ECU CAN connector 4. Check MDPS vehicle grounding status	EMS CAN line inspection
	C1616	CAN BUS OFF		Check the chassis can line
	C1622	Vehicle speed signal error		EMS(Engine ECU) inspection
Torque sensor	C1290	Torque sensor signal error	Inspection after DTC clear. Check connector tightening.	Replace column & housing if phenomenon persists
Torque sensor	C1112	Torque sensor supply voltage error	Check torque sensor and ECU connection connector.	Replace ECU if phenomenon persists
ECU	C1604	ECU hardware error	Inspection the ECU connector after Clear DTC	Replace ECU if phenomenon persists
ECU	C1705	EPS Module pre-charge circuit malfunction	Inspection the ECU connector after Clear DTC.	Replace ECU if phenomenon persists
Motor	C2400	Motor signal error	Inspection the Motor connector after Clear DTC.	Replace Motor if phenomenon persists
Motor	C2401	Motor position sensor error	Inspection the Motor connector after Clear DTC.	Replace Motor if phenomenon persists
ECU/Motor	C2412	Motor current error	Inspection the Motor/ECU connector after Clear DTC.	First ECU replacement Replace Motor if phenomenon persists
Steering angle sensor	C1259	Steering Angle sensor error	Steering angle reset after DTC clear Check connector tightening.	Replace column & housing if phenomenon persists
Battery	C1102	Battery voltage low	Check battery voltage status	Battery voltage charging
Cooperative control	C1696	SPAS signal error	SPAS Inspection	Clear DTC.
Cooperative control	C1697	SPAS signal error	SPAS Inspection	Clear DTC.
Cooperative control	C1612	TCU signal error	TCU Inspection	Clear DTC.
Cooperative control	C1646	TCU signal error	TCU Inspection	Clear DTC.
Cooperative control	C1628	Cluster signal error	Cluster Inspection	Clear DTC.
Cooperative control	C1656	Cluster signal error	Cluster Inspection	Clear DTC.
Cooperative control	C1692	VSM signal error	VSM Inspection	Clear DTC.
Cooperative control	C1693	VSM signal error	VSM Inspection	Clear DTC.
ABS	C1260	Steering angle signal error	Checking after steering angle reset If the C1259 code does not occur, check the CAN line.	Steering angle reset Clear DTC.

Noise / malfunction Repair produres

③ Noise / malfunction Inspection

Symptom

Fault description and inspection method

Countermeasure

Noise/rattle

1. Noise generated near the MDPS column & housing.

–	Remove the surrounding parts and check whether the same noise occurs.

–	Replace the partial component of the column and housing

–	Replace the motor if the noise occurs

Noise/rattle

1. Check the handle and surrounding fastening parts.

–	Check DAB wiring arrangement, DAB, clock spring, multi-function switch, etc.

Check the noise of the relevant part

–	Perform a separate inspection.

2. Check where the C-MDPS is installed.

–	Loosen the cowl fastening bolt and reassemble. (including the through bolt fixing the lower part of the C-MDPS)

Check the installation of the cowl

3. Check the fastening area of the universal joint bolt.

–	Completely remove the universal joint and check whether the noise occurs after the reinstallation.

Fasten with a new bolt if the universal joint bolt is worn

4. Check free playing area of the column when steering while the vehicle is stopped.

–	Check the main wiring connected to the MDPS and column/interference around the shroud/friction

Keep spaces between the surrounding parts

–	Check freeplay around the wiring and column and inspect interference.

④ Cautions to be taken while servicing

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

1.	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.

2.	When fastening the steering, excessive impact may result in twisting the center point of the torque sensor.

3.	When removing/installing the connector the wiring may be damaged (deformed) by excessive external force.

4.	Be cautious when storing and replacing the partial components under the abnormal temperature and humidity conditions.

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