MDPS System A/S Work-Flow
- Noise/Malfunction Inspection
- 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.
- 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.
- Check the wiring on the vehicle side.
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 In case of reoccurrence, replace motor. 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 G-SCAN condition.
- Check connector connection.
- Check ECU CAN line.
- 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). - Checking Connectors and Wiring.
- 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 - Conduct diagnosis if DTCs do not recur after erasing DTCs
- Inspect CAN line if DTCs recur after erasing DTCs.
C1692, C1628, C1693 C1614, C1969, C1697 C1812, C1817
- MDPS Warning light illuminated
- 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.
- Failure occurs due to internal damage because of the drop of and shock and excessive external force on the new partial component.