XJ-S Convertible (XJ27) V12-6.0L (1994)
Intake Air Temperature Sensor: Description and Operation
Effect on Fuel Injection
PURPOSE
Input from this sensor has a small effect on injector pulse width ("ON" time) and it should be regarded as a trimming rather than a control device. It
supplies a measurement of air density, allowing the EFI ECM to fine-tune the air/fuel mixture. For example, air density increases as ambient
temperatures fall and the ECM reacts by increasing pulse width to maintain optimum air/fuel ratio.
OPERATION
The sensor is a device whose resistance varies with changes in intake air temperature. As temperature increases, resistance decreases. Resistance
changes are interpreted by the ECM as air temperature fluctuations.
Temperature / resistance relationship is as follows:
TEMP (°F / °C)
OHMS
32 / 0
640
50 / 10
435
68 / 20
300
86 / 30
210
104 / 40
180
122 / 50
150
Component Location
LOCATION
On top of right throttle body.