Santa Fe Field Case Trouble ABS/TCS warning lamp

Model : Santa Fe	Model year: 2004	Mileage: 35243 km
Displacement: 2700 cc	Fuel : Gasoline	T/A All
Group: Brake system	System:ABS (Anti brake system	Component: Front wheel speed sensor

Subject: ABS/TCS warning lamp “ON”

1) Condition:

1. During driving ABS/TCS illuminates
2. The vehicle has been repaired 2 times but same symptom reoccurred.

2) Cause:

• A short circuit between the wiring and the passenger compartment junction box bracket w/c is apart by 20 cm from EM03 connector.

3) Diagnosis":

1. Scan tool check
   =Diagnostic trouble code,( c1203 FR wheel speed sensor open or short).DTC cannot be arased
2. Inspect the wheel speed sensor unit ( Resistance 1.2 kilo ohms.
   -Inspect the sensor power that inputted in HECU.(Hydraulic Electronic Control Unit.)
   -The separated connector condition: 5Volt is normal.
   -Connect the connector, if normal the output power 2.5 v but the problem vehicles output power is 0 volt. (Short).
3. When checking the resistance between the wheel speed sensor vehicle body the resistance is changed intermittently.
4. Detach the middle connector EM 03
   -Calculate the resistance in sensor and HECU input.
   -Sensor resistance :normal.
   -HECU input resistance :Intermittent short circuit.
   ( check w/ the wiring shaken).
5. Take the wiring cover off and inspect the short circuit.

4) Repair Guide:

1. This problem is caused because of intermittent short circuit in wheel speed sensor.After checking DCT using Hi-Scan,it is possible to erase the DTC.
   when the vehicle stop driving,the DTC does not appear again but if the warning lamp illuminates during driving, the same DTC appears.When similar (EMS,ATM, other system.) happens,check w/ the wiring shaken.
2. The warning lamp is illuminated only after driving when there are problems due to the wheel speed sensor air gap or foreign materials in tone wheel and sometimes high speed dring. Check if the warning lamp illuminates when driving after erasing the DTC or right after when there is a DTC related to wheel speed sensor(Driving test is necessary)