XJ-12 (X300) V12-6.0L (1995)
Intake Air Temperature Sensor: Testing and Inspection
Monitoring Procedure
The sensor output is continuously monitored for high and low value. If a sustained high or low engine control module (ECM) input (indicating a
harness or connector fault) is seen, the relevant diagnostic trouble code (DTC) is stored.
The sensor output is monitored while the engine is running. If the sensor indicates air temperature above 100°C, after the engine has run for some
time, then the range/performance failure judgement is made. The DTC is stored if the failure judgement is made on two successive trips.
Relevant Diagnostic Trouble Codes
P0111
P0112
P0113
Structure of IAT Sensor
The IAT Sensor records the engines intake air temperature and inputs the ECM. The sensor is mounted on the "A" bank air intake elbow. The
sensor is negative temperature coefficient i.e. resistance increases as temperature rises.