Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSJAGUAR1991XJ-6 L6-4.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSAIR TEMPERATURE SENSOR ( AMBIENT / INTAKE )TESTING AND INSPECTION
1991 Jaguar XJ-6 L6-4.0L
Air Temperature Sensor ( Ambient / Intake ): Testing and Inspection
1991 Jaguar XJ-6 L6-4.0LSECTION Testing and Inspection
The Intake Air Temperature Sensor (IATS) should be tested in air.
The temperature of the component should be measured with an accurately calibrated thermometer, make sure that the temperature of the component has stabilized. Using a DMM set to ohms measure the resistance across the connector blades.
Compare the reading obtained to chart; the resistance should be within the band.
If the reading falls outside the band, recheck temperature and resistance measurement. Check each pin to the component case, the resistance should be very high (infinity).
Reject components which fall outside of the tolerance.
The temperature of the component should be measured with an accurately calibrated thermometer, make sure that the temperature of the component has stabilized. Using a DMM set to ohms measure the resistance across the connector blades.
Temperature Chart:
Compare the reading obtained to chart; the resistance should be within the band.
If the reading falls outside the band, recheck temperature and resistance measurement. Check each pin to the component case, the resistance should be very high (infinity).
Reject components which fall outside of the tolerance.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.