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Home >> Scion >> 2006 >> xA Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (1NZ-FE) >> SFI System >> DTC P0128 Thermostat Malfunction >> Typical Malfunction Thresholds

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)
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