Audi Workshop Service and Repair Manuals

Special tools and workshop equipment required

• ◆ V.A.G 1526 A
• ◆ V.A.G 1594 A
• ◆ V.A.G 1598 A
• ◆ V.A.G 1598/12
• ◆ VAS 5051 with VAS 5051/1

• or

• ◆ V.A.G 1551 with V.A.G 1551/3 A

Installation position => Installation position overview - Page 24-5

Notes:

• ◆ After installing idling stabilisation valve, "Basic setting" function (display group 001) must be implemented to move valve to basic position .
• ◆ After switching off ignition, engine control unit enters self-holding phase for 150 minutes. If repairs to idling stabilisation valve are performed during this period, a fault may be stored in the fault memory.

Mechanical checking

• ‒ → Remove idling stabilisation valve -arrow-.
• ‒ Attach connector to removed idling stabilisation valve
• ‒ Switch on ignition.
• ‒ Idling stabilisation valve must be retracted

• ‒ Switch off ignition.
• ‒ Idling stabilisation valve must be extended

If idling stabilisation valve does not react as described:

Checking internal resistance

• ‒ Switch off ignition.
• ‒ Pull connector off idling stabilisation valve.

• ‒ → Connect multimeter between contacts 1 and 4 and 2 and 3 on valve to measure resistance.
• ‒ Specification: 45 ... 60 ω

Note:

Resistance is in the lower tolerance range at ambient temperature and in the upper tolerance range when the engine is warm.

If a specification is not met:

• ‒ Replace idling stabilisation valve.

If idling stabilisation valve is OK:

• ‒ → With ignition switched off, use adapter V.A.G 1598/12 to connect test box V.A.G 1598 A to connector D only of engine control unit (control unit remains disconnected) => Page 24-9.

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

• ‒ Rectify any open/short circuit as necessary.

=> "Current Flow Diagrams, Electrical Fault Finding and Fitting Locations" binder

If no fault is found:

• ‒ Replace engine control unit => Page 24-12.