Intake Air Temperature (IAT) sensor -G42-, checking: Notes

Special tools and equipment 

• VAG1526A
• VAG1594A
• VAG1598/31
• VAS5051 with VAG5051/1

or

• VAG1551 with VAG1551/3B

Component location. Refer to Component locations, overview .

Test sequence 

• Connect VAS 5051 vehicle diagnostic, testing and information system or V.A.G 1551 scan tool and select "Address word" 01 for control module for engine electronics. Refer to VAS5051 vehicle diagnostic, testing and information system or VAG1551 scan tool, connecting and selecting functions .

The ignition must be switched on.

Rapid data transfer HELP Select function XX

When indicated on display

• Press buttons "08" for the function "Read Measuring Value Block" and press Q button to confirm input.

Read Measuring Value Block Q Enter Display Group Number XXX

When indicated on display

• Press buttons "004" for "display group number 04" and confirm by pressing Q- button.

Read Measuring Value Block 4 → 1 2 3 4

Indicated on display

• Check the specified value for the Intake Air Temperature (IAT) sensor in display field 4:

	Display fields
	1	2	3	4
Display group 4: Intake air temperature engine at idle
Display	xxxx RPM	xx.xxx Volt	xxx.x° C	xxx.x° C
Display	Engine speed	Battery voltage	Coolant temperature	Intake air temperature
work range	min.: 800 RPM max.: 6800 RPM	min.:10.000 Volt max.: 15.000 Volt	min.: -48.0° C max.: 143.0° C	min.: -48.0° C  max.: 143.0° C
Specified value	xxxx/min	12.000 - 15.000 Volt	80.0 - 110.0° C	from outside temperature to 110° C 1)

1) If a temperature is displayed which deviates greatly from the ambient temperature of the sensor, the sensor i.e. sensor wires must be checked for contact resistance i.e. open circuit in wiring.