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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 114 (Engine Control System Self-Diagnostics - 4-CYL (Except PZEV)) >> Diagnostic Tests >> DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.

This is the procedure of thermostat. If the engine coolant temperature becomes less than 167°F (75°C), it is abnormal. If not due to the thermostat malfunction, it is abnormal.

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