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; 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 "202" to select Display Group 202 and confirm entry with Q key.

• ‒ Test the exhaust gas temperature control

• ‒ Perform a road test during which
• ‒ Full throttle at engine speeds between 5000...6500 rpm

• is attained.

1)    The control unit recognizes a fault if the difference between bank 1 and bank 2 is more than 8.5 % for a period of 5 sec. and enriches both banks by 30%.

If values above 20% are displayed continuously, then possible causes could be:

• ◆ Fuel pressure too low.
• ◆ Air mass meter signal too low.

• ‒ Proceed to measured value block 220.

• ‒ Test exhaust gas temperature control.

Note:

The exhaust gas temperature should increase to 980°C (display 42 %) to initiate the control process. Values below945°Care displayed as 5%.

• ‒ Repeat test procedure for Bank 2=>Measured value block 201.

If the specifications are not obtained and a fault is stored in the fault memory:

• ‒ Check exhaust gas temperature sender.