XJ-S Convertible (XJ27) V12-6.0L (1994)
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
Coolant Temperature Sensor
PURPOSE
Sensor is input device by which EFI ECM monitors engine coolant temperature.
OPERATION
The sensor is a thermistor device whose resistance changes in relation to temperature. Resistance changes are interpreted by the ECM as engine
temperature fluctuations. When temperatures are within ECM programmed parameters, air/fuel ratio will be enriched during cold start and warm-up by
increasing injector pulse width ("ON" time).
Temperature / resistance relationship is as follows:
TEMP (°F / °C)
OHMS
50 / 10
5.9K
68 / 20
2.5K
86 / 30
1.7K
104 / 40
1.2K
122 / 50
840
140 / 60
600
158 / 70
435
176 / 80
325
194 / 90
250
212 / 100
190
LOCATION
Mounted in left thermostat housing.