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Home >> Lexus >> 2020 >> ES 300h Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 127 (Engine Control System (2GR-FKS) - Diagnostic Codes (03 Of 10)) >> SFI System >> DTC P0128-00: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature); DTC P0128-07: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) Mechanical Failure [08/2021 - ] >> Monitor Strategy

Monitor Strategy

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus ES 350, 2023 Lexus ES 350, 2022 Lexus ES 350, 2021 Lexus ES 350, and 2020 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.
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 1300 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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