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Fuel System

Engine Coolant Temperature (ECT) Sensor Description and Operation

In this manual: Fuel System
General Information — 15Maintenance — 7Engine Mechanical System — 84Engine Electrical System — 49Emission Control System — 22Fuel System — 95Clutch System — 28Manual Transmission — 21Dual Clutch Transmission (DCT) System — 47Drive Shaft and Axle — 20Suspension System — 36Steering — 23Restraints — 39Brake System — 54Body (Interior and Exterior) — 209Body Electrical System — 254Heating, Ventilation, and Air Conditioning — 56
~1min read

Description

The Engine Coolant Temperature Sensor (ECTS) is located in the coolant passage of the cylinder head to detect engine coolant temperature. The ECTS uses a thermistor whose resistance changes with temperature. The electrical resistance of the ECTS decreases as temperature rises and increases as temperature falls. A +5V reference voltage is supplied to the ECTS through a resistor in the ECM; that is, the resistor in the ECM and the thermistor in the ECTS are connected in series. When the thermistor resistance in the ECTS changes with engine coolant temperature, the output voltage also changes. When the engine is cold, the ECM increases the fuel injection duration and controls ignition timing using the engine coolant temperature information to prevent engine stall and improve drivability.

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