Audi Workshop Service and Repair Manuals

• ‒ Connect the V.A.G. 1551 fault reader .
• ‒ Switch on the ignition (engine cold).
• ‒ Select the function "Reading measured value block" (function 08) and Display Group 03.

• ‒ Check display in display zone 4.

• Specified value: approx the same as the ambient temperature
• If there is an open circuit in the wiring to the sensor, a substitute value of 19.5 °C will be displayed.

If display zone 4 shows an implausible value:

• ‒ Switch the ignition off.
• ‒ → Pull off the connector on the sensor => Fitting locations Overview, Page 24-5.
• ‒ Connect the V.A.G 1598/22 test box to the wiring harness for the engine control unit
  .
• ‒ → Check the wiring from the connector for the intake air temperature sensor...
• ‒ ... and engine control unit for an open circuit and short circuit.

• ‒ If necessary, rectify open circuit or short circuit.

If no fault is detected in the wiring:

• ‒ Fit a new intake air temperature sensor (G42).