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Home >> Kia >> 2007 >> Optima EX, 2.4 3 >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle System >> DTC P0721 Output Speed Sensor Circuit Range/Performance >> DTC Detecting Condition
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DTC P0721 Output Speed Sensor Circuit Range/Performance: DTC Detecting Condition

DTC CHART

Item Detecting Condition Possible cause
DTC Strategy 
  • Speed rationality check
  • Signal circuit is open or short
  • Sensor power circuit is open
  • Sensor ground circuit is open
  • Faulty OUTPUT SPEED SENSOR
  • Faulty TCM (PCM)
Enable Conditions 
  • Vehicle speed is over 50Km/h (31 Mile/h) in D,3,2, L (A/T range switch) and SP (SPORTS MODE)
Threshold value 
  • If the output from the output speed sensor is continuously 50% lower or higrer than the value calculated by vehicle speed sensor
Diagnostic Time 
  • More than 1sec
Fail Safe 
  • Locked into 3rd or 2nd gear
  • Apply an electric current to Solenoid valve
  • Manual shifting is possible (2nd --> 3rd, 3rd --> 2nd)
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