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Home >> Hyundai >> 2021 >> Elantra N Line, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 36 (Engine Control System Diagnosis - 2.0L (Except HEV) (5 Of 6)) >> DTC P0638-00: Throttle Actuator Control Range/Performance (Bank 1) >> DTC Information And Inspection >> DTC Detecting Condition

DTC Information And Inspection: DTC Detecting Condition

WARNING: This page is about a different variant/trim than selected.
Item Detecting Condition Possible Cause
DTC Strategy Case 1
  • Throttle position limp-home monitoring
  1. Poor connector connection
  2. Throttle stuck
  3. Open in motor circuit
  4. Faulty motor
  5. Faulty PCM
Case 2
  • Throttle position initial learning condition monitoring
Case 3, 4
  • ETC initial learning abnormality and learning value abnormality
Case 5
  • Return spring monitoring
Case 6, 7
  • ETC relearning value abnormality
Enable Condition Case 1
  • Ignition "ON"
Case 2
  • Throttle position sensor learning when ignition "ON"
Case 3, 4
  • Throttle position learning initial condition satisfaction state
Case 5
  • Throttle position learning status
Case 6
  • Throttle position learning status
  • Throttle position sensor control duty more than 60%
Case 7
  • Deviation from previous learning value and current learning value
  • Throttle valve change detection
  • ECU reset detection
  • Throttle position sensor control duty more than 60%
Threshold Value Case 1
  • The amount of limp-home opening is more than 19.5% or less than 1.0%
Case 2
  • Learning was interrupted due to abnormal conditions
Case 3
  • Engine speed is over 250 RPM or the vehicle speed is over 0 km/h or the accelerator pedal is over 15% or the coolant temperature is over 100°C (212°F), below 5.3°C (41.54°F) or below the intake temperature 5.3°C (41.54°F)
Case 4
  • ETC voltage is less than 10V
Case 5
  • Difference between the throttle opening and the limp-home throttle opening is more than 4.2%
Case 6
  • Mechanical lower limit voltage value of TPS1 signal line is less than 0.35V
  • Mechanical lower limit voltage value of TPS2 signal line is more than 4.65V
  • The sum of the mechanical lower limit voltage values of the TPS1 and TPS2 signal lines is more than 5V
Case 7
  • Mechanical lower limit voltage value (offset) of TPS1 signal line is more than 0.65V
  • Mechanical lower limit voltage value (offset) of TPS2 signal line is less than 4.35V

    * Offset value is 0V
Diagnostic Time Case 1, 2, 3, 4
  • 0.2 seconds
Case 5
  • 1 second
Case 6, 7
  • 0.3 seconds
MIL ON Condition Case 1, 3
  • 2 driving cycles
Case 2, 4, 5, 6, 7
  • 1 driving cycle
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