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Home >> Kia >> 2015 >> Forte LX, Automatic Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis (1 Of 2) - 1.8L >> DTC P0123: Throttle Position Sensor 1 Signal Circuit High Input >> DTC Information >> DTC Detecting Condition
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DTC Information: DTC Detecting Condition

Item Detecting Condition Possible Cause
DTC Strategy
  • Voltage Range check
  1. Open in ground circuit
  2. Short to battery in signal circuit
  3. Poor connection or damaged harness
  4. Faulty TPS1
Case1 Enable Conditions
  • Ignition "ON"
Threshold Value
  • TPS1 > 4.9V
Case2 Enable Conditions
  • Ignition "ON"
  • Engine operating state idle: Pedal value < 0.01% (pedal sensor 1 voltage 0.83 V, not pushed at all)
  • TPS setpoint < 58%
  • TPS 1 and TPS 2 ratio failure detected or TPS 2 failure detected
Threshold Value
  • TPS1 > 3.0V
Diagnostic Time
  • Continuous
MIL On Condition
  • 1 driving cycle
Limp-Home
  • Forced limited power mode: When the DTC is set, the PCM/ECM reduces engine torque by 25% of normal value.
  • The PCM/ECM uses TPS2 signal to monitor the controlled opening angle of the throttle valve.
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