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Engine Control System (1NZ-FE)
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DTC P0128 Thermostat Malfunction
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Typical Malfunction Thresholds
July 1:
So it begins
. Don't worry, this is not in the correct legal jurisdiction!
Typical Malfunction Thresholds
TYPICAL MALFUNCTION THRESHOLDS
Duration that both conditions below are met:
5 seconds or more
Estimated engine coolant temperature
75°C (167°F) or more
ECT sensor output
Less than 75°C (167°F)