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MONITOR DESCRIPTION Fig. 78: Coolant Temperature Threshold Graph The ECM estimates the ECT based on the starting temperature, engine loads, and engine speeds. The ECM then MONITOR STRATEGY MONITOR STRATEGY DTC No. DTC Detection Condition Trouble Area P0128 Conditions (a), (b) and (c) met for 5 seconds (2 trip detection logic) a. Cold start b. Engine warmed up c. ECT less than 75°C (167°F) Thermostat Cooling system ECT sensor ECM Related DTCs P0128: Coolant Thermostat Required Sensors/Components Thermostat, Engine coolant temperature sensor Required Sensors/Components Engine Coolant Temperature (ECT) sensor, Intake Air Temperature Frequency of Operation Once per driving cycle Duration 900 seconds MIL Operation 2 driving cycles Sequence of Operation None
2008 Toyota Tundra 2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
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