Air Temperature Sensor ( Ambient / Intake ): Testing and Inspection

CHECKING INTAKE AIR TEMPERATURE SENSOR
- Remove Intake Air Temperature (IAT) Sensor (G72) and reconnect to connector.
- Plug threaded hole left by removing sensor.
- Connect VAG 1551 Scan Tool (ST) and enter address word 01 for "Engine Electronics" (select functions with engine idling).

^ Indicated on display:

Rapid data transfer HELP
Select function XX

- Press buttons -0- and -8- to select the "Read Measuring Value Block" function.
- Press -Q- button to confirm input.

^ Indicated on display:

Read measuring value block HELP
Input display group number XX

- Press buttons -0- and -3- to enter display group 03.
- Press -Q- button to confirm input.

^ Indicated on display (1 - 4 = display fields)

Read measuring value block 3 HELP
1 2 3 4

NOTE: If something different is indicated on the display, check the VAG 1551 Scan Tool operating instructions.

- Read Intake Air Temperature in display field 4.

^ Specification: approx. ambient temperature.

- Spray Intake Air Temperature Sensor with commercially available chilling agent.
- Read Intake Air Temperature in display field 4.

NOTE: Temperature value must decrease uniformly and without interruption.

- Press --> button.
- Press buttons -0- and -6- to select the "End Output" function.
- Press -Q- button to confirm input.
- If the temperature value does not change as specified:

- Carry out electrical testing, test step 26
- If necessary, replace Intake Air Temperature Sensor.