Checking intake air temperature sensor -G42 — AUDI

AMM AMX
Special tools and workshop equipment required

V.A.G 1526 A
V.A.G 1594 A
V.A.G 1598/31
VAS 5051 with VAS 5051/1

or

V.A.G 1551 with V.A.G 1551/3 A

Fitting location => Fitting location overview Page
24-5

Test sequence

Connect vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G 1551 and select engine electronics control unit with "Address word" 01 => Page
01-3
For this purpose, the ignition must be switched on.

Rapid data transfer
HELP
Select function XX
When adjacent display appears:

Enter "08" to select the function "Reading measured value block" and confirm entry with Q key.

Reading measured value block
Q
Enter display group number XXX
When adjacent display appears:

Enter "004" for "display group number 004" and confirm entry with Q key.

Read measured value block 4
⇒
1
2
3
4
Indicated on display:

Check specified value for intake air temperature sender in display zone 4:

Display zones
1 · 2 · 3 · 4
Display group 004: Intake air temperature with engine idling
Display · xxxx rpm · xx.xxx Volt · xxx.x °C · xxx.x °C
Display · Engine speed · Battery voltage · Coolant temperature · Intake air temperature
Range · 630...6800 rpm · 10.000....15.000 V · -48.0...143.0 °C · -48.0...143.0 °C
Specified value · xxxx rpm · 12.000....15.000 V · 80.0...107.0 °C · From ambient temperature up to 120 °C 1)

1)
Approximate values:

During driving up to 24 °C via ambient temperature.

Whilst stationary heating up to 120 °C is possible.

Checking wiring

Connect the V.A.G 1598/31 test box to wiring harness leading to engine control unit; the engine control unit should not be connected => Page
24-17
.

Check for open circuit and short to positive or earth in the following wiring connections:

Connector / Contact · Test box V.A.G 1598/31 / Socket
1 · 85
2 · 108

Test for short circuits between the two wires.
Rectify any open/short circuit as necessary.

If no wiring fault is detected:

Checking sender:

Unplug connector from intake air temperature sender.

Connect multimeter to sender to measure resistance.

Specified values:

Temperature °C · Resistance kω
-20 · approx. 13.8
0 · approx. 5.5
20 · approx. 2.4
40 · approx. 1.1
60 · approx. 0.6

Example:

If the ambient temperature is within a range between 0°C and 20°C so the resistance value must be between 5.5 kωand 2.4 kω

If specified value is not attained:

Replace intake air temperature sender.