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Home >> Scion >> 2013 >> FR-S Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P0122 - P0230)) >> SFI System >> DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) [05/2013 - ] >> Description

DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) [05/2013 - ]: Description

At the same time as using the engine coolant temperature sensor to determine the engine coolant temperature, the ECM estimates the engine coolant temperature. If the difference between the estimated and actual engine coolant temperatures exceeds a predetermined value, then the DTC is stored, notifying of a malfunction in the functioning of the thermostat.

DTC No. DTC Detection Condition Trouble Area
P0128 Abnormal (open) thermostat functioning detected.
(2 trip detection logic)
  • Thermostat
  • Cooling system
  • Engine coolant temperature sensor
  • ECM
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