Volkswagen Workshop Service and Repair Manuals

In exceptional circumstances e.g. customer complaints concerning droning noises, vibrations at idling speeds, it is permitted to adjust the idling speed slightly. But ensure, that the idling speed is not outside the range printed in the Exhaust emissions test binder, (if the speed is outside the tolerance range it is possible that the vehicle will fail the next exhaust emissions test).

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required

• ◆ Fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3

Test conditions

• ● No fault stored in fault memory
• ● Coolant temperature must be at least 80 °C, =>display group 04, display zone 3.

Work sequence

• ‒ Connect fault reader V.A.G 1551 (V.A.G 1552). Start engine and select "Address word" 01 of engine control unit. When doing this the engine must be running at idling speed.
  (Connecting fault reader and selecting engine control unit .)

• ‒ Press keys 1 and 1 for the "Login procedure" function and confirm input with Q key.

• ‒ Press keys 0, 1, 2, 8 and 3 for the Login code 01283 and confirm input with Q key.

• ‒ Switch off ignition and repeat procedure.

• ‒ Press keys 1 and 0 for the "Adaption" function and confirm input with the Q key.

• ‒ Press keys 0 and 1 for channel number 1 and confirm input with the Q key.

• ‒ Change the specified speed in display zone 2 in jumps of 10 rpm with the following keys:
       V.A.G 1551: keys 1 and 3
       V.A.G 1552: keys ↑ and ↓

Note:

The idling speed must not be adjusted to outside the permissible idling speed range. The up-to-date figures for the idling speed can be found in:

=> Exhaust emissions test binder

• ‒ Confirm input by pressing Qkey.

• ‒ Confirm entry by pressing Qkey.

• ‒ Conclude adaption by pressing ⇒ button.
• ‒ Press keys 0 and 6 for the "End data transfer" function and confirm input with the Q key.
• ‒ Switch off ignition.