Audi Workshop Service and Repair Manuals

Special tools and workshop equipment required

• ◆ VAS 5051 with VAS 5051/1

• or

• ◆ V.A.G 1551 and V.A.G 1551/3 A

Test requirement:

• ● Coolant temperature at least 80 °C

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 engine must be idling.

=> Motronic injection and ignition system; Repair group 01; Self-diagnosis of Motronic system; Connecting vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G 1551 and selecting functions

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

• ‒ Enter "115" to select Display Group 115 and confirm entry with Q key.

• ‒ Test charge pressure control.

• ‒ Perform road test with engine running at
• ‒ Full throttle

• for some period.

• ‒ Perform measurement at full throttle.

Specified pressure and actual pressure should not deviate by more than max±20 mbar.

• ‒ Proceed to measured value block 117.
• ‒ Check function of accelerator pedal in display zone 2 by depressing accelerator pedal to full throttle for a short period of time.

If the specification 100% is not obtained at full throttle:

• ‒ Check accelerator pedal.
• ‒ Proceed to measured value block 116.

• ‒ Check adjusting factors in display zones 2 to 4.

If the display in display zone 2 indicates an adjusting factor of <0 %, the octane rating of the fuel might not be correct.

• ‒ Fill up tank with correct fuel.

If the display in display zone 3 indicates an adjusting factor of <0 %, the coolant temperature is too high (the overheating warning lamp in the combi-instrument lights up) or the engine control unit is receiving an incorrect temperature signal from the combi-instrument.

• ‒ Check coolant temperature gauge.

=> Electric system; Repair group 90

If the display in display zone 4 indicates an adjusting factor of <0 %, the air being drawn in is too hot, or the intake air temperature sender is defective.

=> Motronic injection and ignition system; Repair group 24

• ‒ Proceed to measured value block 114.

The load values in display zones 1 to 3 may differ up to±5 %.

If the specifications in the measured value blocks are not obtained:

Test charge air pressure sender -G31.