Audi Workshop Service and Repair Manuals

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

• ◆ Test box V.A.G 1598/22
• ◆ Hand multimeter V.A.G 1526 or multimeter V.A.G 1715
• ◆ Adapter set V.A.G 1594
• ◆ Current flow diagram

Check conditions

• ● The battery voltage must be at least 11.5 V.
• ● If the vehicle is equipped with an air conditioning system, this must be switched off.
• ● All electrical consumers, e.g. lights and rear window heating must be switched off.
• ● Hall sender screwed on tight

Test sequence

• ‒ → Pull 3-pin connector off Hall sender -arrow-.

• ‒ → Connect multimeter to measure voltage with adapter cables from V.A.G 1594 to contacts 1 (positive) and 3 (earth) on the Hall sender connector.
• ‒ Switch on ignition.
      Specification: min. 4.5 V
• ‒ Switch off ignition.

If no voltage is present:

• ‒ → Connect test box V.A.G 1598/22 to control unit wiring harness
  .

• ‒ → Check wiring between test box and 3-pin connector (connector to control unit) for open circuit using current flow diagram.
      Contact 1+socket 62
      Contact 2+socket 60
      Contact 3+socket 54
      Wire resistance: max. 1.5 ω
• ‒ Additionally check wires for short to one another, to vehicle earth and to battery positive.
      Specification: ∞ω

If no wiring fault is detected and voltage was present between contacts 1+3:

• ‒ Renew Hall sender (G40)
  => Page 28-5, item 8.

If no wiring fault is detected and no voltage was present between contacts 1+3:

• ‒ Replace engine control unit
  => Page 24-134.