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 location overview Page 24-5

Test sequence

• ‒ Connect the 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
  For this purpose, the engine must be running at idle speed

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

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

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

1)    If a temperature is displayed which deviates greatly from the ambient temperature of the sender, check sender and sender wiring for contact resistances and open circuit.

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 24-19.
• ‒ → Unplug connector -1- at coolant temperature sender -G42 -2-.

• ‒ → Check 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:

Checking sender:

• ‒ → Connect multimeter to sender to measure resistance.

Specifications:

If specified value is not attained:

• ‒ Replace intake air temperature sender.