Audi Workshop Service and Repair Manuals

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 locations 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 by entering address word "01" ( .)
  When doing this the ignition must be switched on.

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

• ‒ Enter "004" to select Display Group 004 and confirm entry with Q key.

• ‒ Check display value for intake air temperature sender(display zone 4):

1)    Possible readouts:

When the vehicle is being driven this figure may be up to 24 °C higher than ambient temperature.

When the vehicle is standing, temperatures up to 120 °C are possible due to heat radiated from the engine.

Checking wiring connections

• ‒ Connect test box V.A.G 1598/31 to wiring harness for engine control unit. Do not connect to the engine control unit itself.
  => Page 24-16.

• ‒ → Test for open circuit and short to positive or earth in the following wiring connections:

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

If no wiring fault is detected:

Testing sender

• ‒ → Connect multimeter (resistance measurement range) to sender.

Specifications:

Example:

If the air temperature is between 0 °C and 20 °C, the resistance should be between 5.5 kωand 2.4 kω.

If the specification is not attained:

• ‒ Fit a new intake air temperature sender.