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Home >> Lexus >> 2020 >> UX 200 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Engine Control System (SFI) (M20A-FXS) - Diagnostic Codes (2 Of 6) (Hybrid)) >> SFI System >> DTC P0128-00: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature); DTC P012807: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) Mechanical Failure [10/2018 - ] >> Monitor Strategy

Monitor Strategy

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Related DTCs P0128: Coolant thermostat (judgment by simulated engine coolant temperature)
P0128: Coolant thermostat (judgment by engine coolant temperature change at high vehicle speed)
Required Sensors/Components (Main) Thermostat
Engine coolant temperature sensor
Required Sensors/Components (Related) Intake air temperature sensor (for mass air flow meter sub-assembly)
Vehicle speed sensor
Frequency of Operation Once per driving cycle: Judgment by simulated engine coolant temperature
Continuous: Judgment by engine coolant temperature change at high vehicle speed
Duration 430 seconds: Judgment by simulated engine coolant temperature
-: Judgment by engine coolant temperature change at high vehicle speed
MIL Operation 2 driving cycles
Sequence of Operation None
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