Audi Workshop Service and Repair Manuals

Special tools, testers 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

Installation position => Overview installation positions - Page 24-5

Test sequence

• ‒ Connect up vehicle diagnosis, measurement and information system VAS 5051 or fault reader V.A.G 1551 and select engine electronics control unit with "Address word" 01 .
  When doing this the ignition must be switched on.

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

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

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

1)    Approximate values:

Up to 24 oC in excess of ambient temperature when driving.

Up to 120 oC possible when stationary.

Checking wiring

• ‒ Connect the V.A.G 1598/31 test box to wiring harness leading to engine control unit; engine control unit should not be connected => Page 24-20.

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

• ‒ Check for shorts between the two lines.
• ‒ Rectify any open/short as necessary.

If no wiring fault is detected:

Check sensor:

• ‒ Unplug connector from intake air temperature sender.

• ‒ → Connect multimeter to sender to measure resistance.

Specified values:

Example:

If air temperature is between 0 oC and 20 oC, resistance must be between 5.5 kωand 2.4 kω .

If the specified value is not attained:

• ‒ Replace intake air temperature sender.