Kia Picanto: Steering System / Motor Driven Power Steering

Kia Picanto JA 2017-2021 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 +
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
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.
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
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.
C1697
Cooperative control
C1612
TCU signal error
TCU Inspection
Clear DTC.
C1646
Cooperative control
C1628
Cluster signal error
Cluster Inspection
Clear DTC.
C1656
Cooperative control
C1692
VSM signal error
VSM Inspection
Clear DTC.
C1693
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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