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Home >> Toyota >> 2003 >> Matrix Base, FWD, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Self Diagnostics >> Diagnostic Tests >> DTC P0128: Thermostat Malfunction (Corolla Model) >> Circuit Description
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Circuit Description

If water temperature doesn't reach 167°F (75°C) even after warming up, it is abnormal. Detecting condition of DTC is when there are following conditions: