LEMON Manuals: Even more car manuals for everyone
Home >> Hyundai >> 2018 >> Kona Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 149 (Engine Control System Diagnosis - 2.0L (1 Of 3)) >> DTC P0128-00: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) >> DTC Information And Inspection >> DTC Detecting Condition

DTC Information And Inspection: DTC Detecting Condition

WARNING: This page is about a different car, the 2021 Hyundai Kona. However, it is still accessible from the selected car via links, so may be relevant.
Item Detecting Condition Possible Cause
Main Action
  • Coolant temperature is not reached warm up state
  1. Faulty cooling system
  2. Faulty ECT sensor
  3. Poor connection or harness damage
Prerequisite Condition
  • Fuel cut-off phase is lower than 20%.
  • Low load phase is lower than 50%.
  • High vehicle speed phase is lower than 90%.
  • Engine speed is faster than 4800 RPM
  • Battery voltage is between 11V and 16V
  • Intake air temperature decrease compared to starting temperature is higher than -20° (-4°F).
  • Engine coolant temperature during engine start is lower than 54.8° (130.6°F)
  • Ambient air temperature is higher than -10° (14°F)
Threshold Value
  • Measured coolant temperature is lower than 84° (183.2°F) when modeled coolant temperature is higher than 95° (203°F).
Diagnostic Time
  • 10 to 30 Minutes
MIL-On Condition
  • 3rd Driving Cycle
scientia non olet · About LEMON Manuals