Kia Picanto: Steering System / Motor Driven Power Steering
Description and operation
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
1. Steering column 2. Universal joint
| 3. MDPS motor 4. MDPS ECU
|
Schematic diagrams
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
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. |
Description and operation
Description
The
heated steering wheel system improves the thermal comfort of the driver
by heating the steering wheel when manually selected.
1. Heated control un ...
Repair procedures
Replacement
1. Disconnect the battery negative cable.
2. Remove the crash pad lower panel. (Refer to Body - "Crash pad lower panel")
3. Disconnect the MDPS ECU connector. ...
Other information:
Components and components location
Components
1. Knob 2. Boots 3. Shift lever assembly 4. Shift cable 5. Select cable
Repair procedures
Inspection
1.Check for proper operation of control shaft lever when operated (1st, 2nd, 3rd, 4th, 5th, R).
2.When the shift lever is enga ...
Service in
It calculates and displays when you
need a scheduled maintenance service
(mileage or days).
If the remaining mileage or time reaches
1,500 km (900 mi.) or 30 days,
“Service in” message is displayed for
several seconds each time you set the
ignition switch or Engine Start ...