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Home >> Jaguar >> 2010 >> XFR >> Repair and Diagnosis >> External Pages >> Different car >> Section 177 (Electronic Engine Controls - V8 5.0L Petrol/V8 S/C 5.0L Petrol -- XF/X250) >> Electronic Engine Controls - V8 5.0L Petrol/V8 S/C 5.0L Petrol >> Description And Operation >> Electronic Engine Controls - System Operation And Component Description (G1452621) >> Engine Coolant Temperature Sensors

Engine Coolant Temperature Sensors

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The ECT sensors are NTC (negative temperature coefficient) thermistors that allow the ECM to monitor the engine coolant temperature.

There are two identical ECT sensors installed, which are identified as ECT 1 and ECT 2. Each sensor is secured with a twist-lock and latch mechanism, and is sealed with an O-ring. A two pin electrical connector provides the interface between the sensor and the engine harness.

ECT 1 

ECT 1 is installed in the heater manifold, at the rear of the RH cylinder head. The input from this sensor is used in calibration tables and by other systems.

ECT 2 

ECT 2 is installed in the lower hose connector which attaches to the bottom of the thermostat. The input from this sensor is used for OBD (on-board diagnostic) 2 diagnostics and, in conjunction with the input from ECT 1, to confirm that the thermostat is functional.

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