Hyundai Tucson: Electric Power Steering / Repair procedures

General Inspection
After or before servicing the EPS system, perform the troubleshooting and test procedure as follows. Compare the system condition with normal condition in the table below and if abnormal symptom is detected, perform necessary remedy and inspection.
Test condition
Normal condition: Motor must not supply steering assist.
Symptom
Possible cause
Remedy
IG Off
Motor supplies steering assist.
ASP is not calibrated.
Perform the ASP calibration using a scan tool.
IG power supplies
Inspect the IG power supply line.

Test condition
Normal condition: Motor must not supply steering assist, Warning lamp is illuminated.
Symptom
Possible cause
Remedy
IG On/Engine Off
Motor supplies steering assist.
ASP is not calibrated.
Perform the ASP calibration using a scan tool.
EMS CAN signal is not received.
Inspect the CAN line.
Warning lamp is not illuminated.
Cluster fault
Inspect the cluster and cluster harness

Test condition
Normal condition: Motor supplies steering assist, Warning lamp is not illuminated.
Symptom
Possible cause
Remedy
IG On/Engine On
Warning lamp is illuminated and Motor dose not supply steering assist.
EPS (Hot at all times) and IG power supply fault
Inspect the connector and harness for EPS (Hot at all times) and IG power supply line.
DTC is detected by system.
Perform the self test using a scan tool and repair or replace.
Warning lamp is illuminated and Motor supplies steering assist.
ASP is not calibrated.
Perform the ASP calibration using a scan tool.
CAN communication between EPS and cluster is fault.
Inspect the CAN line.

ASP: Absolute Steering Position
CAN: Controller Area Network
EMS: Engine Management System
   
The following symptoms may occur during normal vehicle operation and if there is no EPS warning light illumination, it is not malfunction of EPS system.
After turning the ignition switch on, the steering wheel becomes heavier while it performs EPS system diagnostics, for about 2 seconds, then it becomes normal steering condition.
After turning the ignition switch on or off, EPS relay noise may occur but it is normal.
When it is steered, while the vehicle is stopped or in low driving speed, motor noise may occur but it is normal operating one.
MDPS diagnosis principle
This bulletin provides Motor Driven Power Steering (MDPS) diagnostic procedure using GDS to diagnose theheavy steering effort, abnormal position of steering parts and MIL illumination in steering system.
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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.

MDPS Performance Inspection
1.
Connect self-diagnosis connector(16pins) located in the lower of driver side crash pad to self-diagnosis device.
2.
Turn the self-diagnosis device after key is ON.
3.
After Selecting the "vehicle model" and "system", select the "MDPS TEST" on GDS vehicle selection screen.

4.
Prepare a vehicle according to the required vehicle’s conditions.

5.
Search the DTCs relevant to the MDPS and then erase them if found.

6.
Perform the MDPS TEST.

7.
If the results of MDPS performance inspection are “OK”, click “OK” and then finish the service work.

8.
If the results of MDPS inspection are “Check”, click “Inspection” and then inspect below items.
(1)
EPS Warning light illuminated

A.
Inspect DTCs relevant to the steering system.
DTC
Type
Service action
C1112
EPS Warning light illuminated
Conduct repair according to the DTC diagnostic guide.
C1290
C1604
C1704
C1705
C2400
C2401
C2412
C2413

(2)
Vibration and Noise

A.
Inspect MDPS portions where are mounted to the body. (Checking tightening conditions of bolts and nuts)
B.
Inspect universal joint mounting bolts.
(3)
Inspection for heavy steering effort
A.
Inspect tire pressure and width.
B.
Check that the heavy steering effort occurs or not when vehicle speed is not received.
C.
Check DTCs relevant to the CAN communication error.
DTC
Type
Service action
C1611
DTCs relevant to the CAN communication
Conduct diagnosis if DTCs do not recur after erasing DTCs
C1616
C1622
C1692
C1628
C1693
Inspect CAN line if DTCs recur after erasing DTCs.
C1614
C1696
C1697
C1812
C1817

(4)
Other DTC judgment
DTC
Type
Service action
C1102
Low voltageof battery
Conduct diagnosis after inspecting battery.
C1109
C1261
Setting steering angle to zero point
Reset steering angle to zero point
C1603
Overheated
Conduct retest after cooling MDPS motor.

ASP (Absolute Steering Position) calibration or EPS type recognition
   
Check if the battery is fully charged before ASP calibration or EPS type recognition.
Be careful not to disconnect any cables connected to the vehicle or scan tool during ASP calibration or EPS type recognition.
When the ASP calibration or EPS type recognition is completed, turn the ignition switch off and wait for several seconds, then start the engine to confirm normal operation of the vehicle.
ASP Calibration
1.
Connect self-diagnosis connector(16pins) located in the lower of driver side crash pad to self-diagnosis device.
2.
Turn the self-diagnosis device after key is ON.
3.
After Selecting the "vehicle model" and "system", select the "ASP Calibration" on GDS vehicle selection screen.

EPS Type Recognition
1.
Connect self-diagnosis connector(16pins) located in the lower of driver side crash pad to self-diagnosis device.
2.
Turn the self-diagnosis device after key is ON.
3.
After Selecting the "vehicle model" and "system", select the "EPS Type Recognition" on GDS vehicle selection screen.

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