MDPS System A/S Work-Flow
(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.
- Check the wiring on the vehicle side.
- Check for open / short - circuit due to faulty connection, damage, or foreign substance.
Battery Connector Vehicle Signal Connector Pin no Fin name Pin no Fin name 1 Battery (+) 1 Ignition 2 Battery (-) 2 - 3 - 4 - 5 - 6 - 7 CAN_High 8 CAN_Low - Check the wiring on the ECU side (motor 3 - phase power).
- Check for open / short - circuit due to faulty connection, damage, or foreign substance.
- Check the motor connector.
- Terminal Expansion and damage
NOTE:- Must be replaced the MDPS motor if occur terminal expansion and damage.
- Check the motor wiring.
NOTE:
- Must be replaced the MDPS motor if occur damage or problem.
2 - 2 Inspection Parts 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. | In case of reoccurrence, replace motor. |
| C1604 | ECU over/discharge error | ||
| C2413 | ECU hardware error | ||
| C2400 | Motor signal error | ||
| 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 |
|
Check the EMS CAN Line. |
| C1616 | CAN BUS OFF | Check the chassis CAN Line. | |
| C1622 | Vehicle speed signal error | Check the EMS (Engine ECU). |
(3) MDPS Performance Inspection
- This bulletin provides Motor Driven Power Steering (MDPS) diagnostic procedure using GDS to diagnose the heavy steering effort, abnormal position of steering parts and MIL illumination in steering system.
- GDS judges the MDPS normal / abnormal state by calculating the MDPS motor torque generated when turning the steering wheel to left and right at 360° per 3 seconds.
- Connect self - diagnosis connector (16 pins) located in the lower of driver side crash pad to self - diagnosis device.
- Turn the self - diagnosis device after key is ON.
- After Selecting the "vehicle model" and "system", select the "MDPS TEST" on GDS vehicle selection screen.
- Prepare a vehicle according to the required vehicle's conditions.
- Search the DTCs relevant to the MDPS and then erase them if found.
- Perform the MDPS TEST.
- If the results of MDPS performance inspection are "OK", click "OK" and then finish the service work.
- If the results of MDPS inspection are "Check", click "Inspection" and then inspect below parts.
- MDPS Warning light illuminated
- Inspect DTCs relevant to the steering system.
- Vibration and Noise
- Inspect MDPS portions where are mounted to the body. (Checking tightening conditions of bolts and nuts)
- Inspect universal joint mounting bolts.
- Inspection for heavy steering effort
- Inspect tire pressure and width.
- Check that the heavy steering effort occurs or not when vehicle speed is not received.
- Check DTCs relevant to the CAN communication error.
| DTC | Type | Service Action |
|---|---|---|
| C1611, C1616, C1622 | DTCs relevant to the CAN communication |
|
| C1692, C1628, C1693 | ||
| C1614, C1969, C1697 | ||
| C1812, C1817 |
(4) MDPS Common Problems
| Case 1 | Case 2 | Case 3 |
|---|---|---|
| Multifunction switch noise | Clock spring noise | DAB / Wire noise |
| Replace multifunction switch | 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 |
CAUTION:
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.