Air Temperature Sensor ( Ambient / Intake ): Testing and Inspection
Intake air temperature (IAT) sensor, checkingRequirement
- VAG 1551 Scan tool connected
- switch OFF ignition
- disconnect harness connector from IAT sensor
- remove IAT sensor from intake manifold
- reconnect sensor to harness connector
- plug hole in manifold where sensor was removed
- start engine and let idle
- press 1 button to select operating mode "Rapid Data Transfer"
- display will appear as shown
- press 0 and 1 buttons to select address word "Engine Electronics"
- display will appear as shown
- press Q button to enter input
- press => button
- press 0 and 8 buttons to select 08 "Read test value block"
- press Q button to enter input
- display will appear as shown
- press 0 and 3 buttons to select display group 03
- display will appear as shown
- press Q button to enter input
- display will appear as shown
- read value displayed in channel 4 "Intake manifold temperature" (approx. ambient temperature)
- spray IAT sensor with a commercial cooling spray
- displayed temperature must decrease
- press => button
- press 0 and 6 buttons to select function 06 "Ending output"
- display will appear as shown
- press Q button to enter input
If displayed value does not decrease
- perform electrical checks
- if necessary, replace air intake temperature (IAT) sensor