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Home >> Toyota >> 2004 >> Matrix Base, FWD, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 36 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0116: Engine Coolant Temperature (ECT) Sensor Circuit Range/Performance Fault >> Circuit Description
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Circuit Description

WARNING: This page is about a different car, the 2002 Lexus GS 430. However, it is still accessible from the selected car via links, so may be relevant.

The ECT sensor is a thermistor that monitors coolant temperature. DTC P0116 is set when after engine has been running for predetermined amount of time, sensor value is out of specified range. Possible causes are:

NOTE: If DTCs P0115 and P0116 are output together, inspect ECT circuits for an open. Repair as necessary. See WIRING DIAGRAMS article. Repair DTC P0115 first.
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