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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0128: Thermostat Fault >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.

ECM monitors vehicle speed, outside air temperature and engine load, and compares that information to engine coolant temperature. If engine coolant temperature is not within preset parameters, DTC P0128 will set. Possible causes are:

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