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Home >> Lexus >> 1995 >> LS 400 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - OBD-II >> Diagnostic Testing >> Code P0115: Engine Coolant Temperature (ECT) Sensor Circuit >> Circuit Description
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Circuit Description

The ECT sensor is a thermistor sensor that monitors coolant temperature. Code is set when ECM detects a open or short circuit. Possible causes are:

NOTE: If Codes P0110, P0115 and P0120 are output together, inspect ECM terminal E2 (ground) circuit. Repair as needed. See appropriate wiring diagram in WIRING DIAGRAMS article.
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