Repair Procedures

GENERAL INSPECTION

Diagnostic Note

Failure rate	Inspection item	Symptom	EXPLANATION	Noticed
Drop, Impact and Overload	Engine	Abnormal Noise	Visible or invisible damage may be present. The steering wheel may spring to one side with fragments falling out. Some engine/control unit parts are sensitive to vibration and impact. Overloading may cause unexpected damage.	Do not use a damaged EPS. Do not overload the parts.
	ECU	Damaged circuit Poor solder joint Printed circuit board broken Damaged parts
	TORQUE SENSOR	Insufficient steering effort	Overloading the input shaft may cause a torque sensor malfunction.	Do not strike the connecting parts (when inserting and torquing). Use the special tool to remove the power steering. (Do not press on it.) Do not use a damaged EPS.
	WOOD	Insufficient steering effort (imbalance between left and right movement)		Do not use a damaged EPS.
pull / push	Beam	Failure - electrical operation not possible EPS malfunction	Disconnection between the harness connector and the beam	Do not overload the beam
Abnormal storage temperature	Engine / ECU	Abnormal steering effort due to engine/ECU malfunction	Wire in normal condition Even slight mold may cause some engine / ECU parts to malfunction	Maintain normal temperature and proper humidity during storage. Avoid immersion in water.

1. 1
   Do not strike electronic parts; if dropped or struck, replace them.
2. 2
   Avoid heat and mold on electronic parts.
3. 3
   Do not touch the connection terminal to avoid deformation and static electric shock.
4. 4
   Do not strike the engine and torque sensor parts; if dropped or struck, replace them.
5. 5
   Connectors must be disconnected or connected with the ignition in the ALL OFF position.

MDPS System Inspection and Diagnosis

Before or after servicing the EPS system, perform the troubleshooting procedure and check as follows. Compare the system condition with the normal condition in the table below, and if an abnormal symptom is found, apply the necessary tool and perform the inspection.

TEST CONDITIONS		Symptoms	Passenger Duration	Warning Light	Cause	Inspection Item
IGN OFF / Engine OFF / Stationary		Steering malfunction	-	-	-	Normal
		Power steering assist operation	120 seconds	Indicator is illuminated.	Full power is applied even when ALL is off. Steering angle direction is not initialized.	1 Check the entire power supply line. 2 Use a scan tool to initialize the steering wheel angle.
			120 seconds	The indicator is off.	Cluster or CAN signal malfunction	Operate the cluster, cluster line and communication line MAY.
ALL ON / Engine OFF / Stationary	-	Steering malfunction	-	-	-	Normal
		Power steering assist operation	120 seconds	Indicator is illuminated.	Steering angle is not initialized.	Use a scan tool to initialize the steering wheel angle.
			120 seconds	The indicator is off.	Cluster or CAN signal malfunction	Operate the cluster, cluster line and communication line MAY.
	When the engine is running, ALL remains on but the engine stops.		120 seconds	Indicator is illuminated.	No EMS signals received (CAN communication)	Check the communication line. MAY.
			120 seconds	The indicator is off.	Cluster or CAN signal malfunction	Operate the cluster, cluster line and communication line MAY.
ALL ON / Engine running / Stationary		Steering malfunction	-	Indicator is illuminated.	Power supply line faults in EPS and ALL system	Check the EPS and ALL system power supply lines.
			-	Indicator is illuminated.	Diagnostic Trouble Code (DTC) is displayed	Use a scan tool to diagnose and troubleshoot.
		Power steering assist operation	-	-	-	Normal
			-	Indicator is illuminated.	Diagnostic Trouble Code (DTC) is displayed	Use a scan tool to diagnose and troubleshoot.

ASP: Absolute Steering Position CAN network controller + Area EMS: Engine Management System

DBDM System Maintenance Schedule

DTC Inspection Items

diagnostic trouble codes	Cause	Symptoms	Inspection Item
C1112	Sensor Supply Voltage	① MDPS LED is on ② Steering malfunction	Check the MDPS ECU connector. Check the CAN line and all power supply lines Check the MDPS ECU (motor) wiring Replace the MDPS ECU.
C1604	ECU hardware error
C1704	ECU safety relay malfunction
C2401	Motor position sensor error		Check the MDPS motor connector. Check the MDPS motor wiring. Replace the MDPS motor. Check the MDPS ECU connector. Replace the MDPS ECU. (Component failure inside the MCU-type ECU or current sensor)
C2412	Motor circuit short to ground or open circuit
C2413	Motor current error

Connector and Wiring Inspection

1. Connector and Wiring Inspection. Check connectors and wiring for damage, pushed back pins, or poor connection.
   1. Check the vehicle side wiring.
      • Make sure there is no short to ground or open circuit caused by poor connection, damage, or foreign material.

      

      Connector Name	PIN	Function
      MDPS_Power (A)	1	Battery (+)
      	2	Battery (-)
      MDPS_Unit (B)	1	Ignition
      	2	-
      	3	-
      	4	-
      	5	-
      	6	-
      	7	CAN High
      	8	CAN Low

   2. Check the wiring on the ECU side (three-phase motor).
      • Make sure there is no short to ground or open circuit caused by poor connection, damage, or foreign material.

      

      PIN	Pin name
      1	Could
      2	PV
      3	approx.

   3. Check the motor connector.
      • Terminal expansion and damage.

      

   4. Check the motor wiring.