LR000291 - Coolant Temperature Sensor

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Coolant Temperature Sensor - engine coolant temperature sensor for the AJ-series 4.4L V8 and 4.2L supercharged V8 petrol engines. The sensor is a thermistor exposed to engine coola nt; its electrical resistance falls as coolant temperature rises. The engine control module reads this signal to set fuelling and ignition timing, control warm-up enrichment, switch the cooling fans and drive the temperature display. A sensor that has drifted or failed can cause poor cold starting, raised fuel consumption, cooling fans running incorrectly and a stored engine management fault code. Show more