Audi Workshop Service and Repair Manuals

Fitting location of sender and connector

• ‒ Connect up 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 ignition must be switched on.

• ‒ Press keys 0 and 8 for the function "Read measured value block" and confirm entry with Q key.

• ‒ Press keys 0, 0 and 4 for "display group number 4" and confirm entry with Q key.

• ‒ Check specified result for intake air temperature sender (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:

• ‒ Switch ignition off.
• ‒ 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.
  .

• ‒ → Check wiring between test box and 2- pin connector for open circuit using current flow diagram. Specified result; max. 1.5 ω

• ‒ Check the wiring for short circuit between Contact 1 and Contact 2 on 2-pin connector and for short to earth or positive.

If no wiring fault is detected:

Checking sender:

• ‒ → Measure resistance on connector to intake air temperature sender (G42) between contact 1 (signal) and contact 2 (earth).

• ‒ If the value does not match specified value, fit a new intake air temperature sender.
• ‒ In order to renew the sender, the intake manifold must be removed => Page 24-16.