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 1598/11

Note:

Engines in line with emission standard ECE 15.04 (=> Coding control unit, Page 01-52) only have one Lambda probe for bank 1.

Test sequence

• ‒ Unplug Lambda probe connector for left hand or right hand cylinder bank.
  (Installation position )

• ‒ → Connect up multimeter as follows to measure resistance.

• ‒ Specified value: ∞ ω

If the specification is not obtained:

• ‒ Replace Lambda probe.

If the specification is obtained:

• ‒ → Connect up multimeter as follows to measure voltage.

• ‒ Switch on ignition.
• ‒ Specification: 400 ± 50 mV.

If the specification is not obtained:

• ‒ → With the ignition switched off, use adapter V.A.G 1598/11 to connect test box V.A.G 1598 A to connector C 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:

Lambda probe Bank 1 -G39

Lambda probe, bank 2 -G108

• ‒ 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.