Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSKIA2015OPTIMA SX TURBOREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLELECTRONIC STABILITY CONTROL SYSTEM DIAGNOSIS - OPTIMA (EXCEPT HEV)DTC C1201: WHEEL SPEED SENSOR REAR - LH RANGE PERFORMANCE INTERMITTENTWIRING INSPECTIONCOMPONENT INSPECTION

2015 Kia Optima SX Turbo

Component Inspection

2015 Kia Optima SX TurboSECTION Component Inspection

■ Wheel Speed Sensor Inspection
1. Lift vehicle with suitable lift and refer to shop handbook to remove wheel and wheel guard.
2. Substitute with known-good Rear LH wheel speed sensor.
3. Ignition "ON".
4. Position the shift lever to "N".
5. Rotate wheel slowly by hands.
6. Monitor "Wheel Speed Sensor-Left Rear" parameters in "Current Data" with GDS.
  Specification : Wheel speed proportionally increase to rotation speed of wheel
  
  Fig 1: Display - Rear LH Wheel Speed Sensor Data
  Courtesy of KIA MOTORS AMERICA, INC.
  
  Fig.1) Rear LH wheel speed sensor data with low wheel rotation speed
7. Is the measured waveform within specifications?
  YES
  - Refer to service information to replace Rear LH Wheel Speed Sensor and then go to VERIFICATION OF VEHICLE REPAIR procedure.
  NO
  - Substitute with known-good HECU and check for proper operation. If problem is corrected, replace HECU and then go to VERIFICATION OF VEHICLE REPAIR procedure.
  - Check for damage of rotor teeth or wheel bearing. If NG, repair as necessary and then go to VERIFICATION OF VEHICLE REPAIR procedure.
  CAUTION:
  n case of replacing HECU, perform following procedures
  1. "ASP Calibration" for steering angle sensor offset correction.
  2. "Longitudinal G-Sensor Calibration" for longitudinal sensor offset correction.
  3. "Variant Coding".

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.