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HOMESERVICE MANUALSKIA2015OPTIMA SX TURBOREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 107 (ENGINE CONTROL SYSTEM DIAGNOSIS (2 OF 3) - 2.4L (EXCEPT HEV))DTC P0638: THROTTLE ACTUATOR CONTROL RANGE/PERFORMANCE (BANK 1)DTC INFORMATIONDTC DETECTING CONDITION
2015 Kia Optima SX Turbo

DTC Information: DTC Detecting Condition

2015 Kia Optima SX TurboSECTION DTC Detecting Condition
WARNING: This page is about a different variant/trim than selected.
DTC DETECTING CONDITION

Item Detecting Condition Possible Cause
DTC Strategy Case 1
  • TPS adaptation condition check
  1. Poor connection or damaged harness
  2. Faulty ETC Motor
  3. Faulty TPS
  4. ETC adaptive values NOT reset / relearned after performing the following repairs
    • ETC assembly or TPS replacement
    • ECM replacement
    • ECM software upgrade
Case 2
  • ETC Limp Home position check
Case 3
  • Lower mechanical stop adaptation voltage range check
Enable Conditions
  • During TPS adaptation
Threshold Value Case 1
  • TPS adaptation is requested but not possible
Case 2
  • Difference between Throttle sensor voltage in limp home and limp home set point > 0.3V
Case 3
  • Difference between Throttle sensor voltage in lower mechanical stop position and lower mechanical stop position set point > 0.3V
Diagnostic Time
  • 1.2 Seconds
Limp-Home
  • Forced limited RPM mode : The PCM limits engine speed to 1500 RPM
  • Electrical check of the ETC system is prohibited
MIL On Condition
  • Immediate
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.