Audi Workshop Service and Repair Manuals

Checking voltage supply

• ‒ → Unplug black connector -1- for Hall sender.

• ‒ → Connect multimeter (voltage measurement range) as follows:

• ‒ Switch on ignition.
• ‒ Specification: approx. battery voltage

If the specification is not attained:

• ‒ Test wiring for open circuits and rectify if necessary.

Testing earth supply

• ‒ → Connect multimeter (voltage measurement range) between contact 1 (positive) and 3 (earth).
• ‒ Switch on ignition.
• ‒ Specification: approx. battery voltage

If the specification is not attained:

• ‒ Connect test box V.A.G 1598/31 to wiring harness for engine control unit.Do notconnect to the engine control unit itself:
• ‒ Connecting test box to engine control unit without protective housing=>Page 23-49.
• ‒ Connecting test box to engine control unit with protective housing=>Page 23-51.

• ‒ → Test for open circuit and short circuit to positive in the following wiring connection:

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

• ‒ Replace engine control unit
• ‒ Removing and installing engine control unit without protective housing=>Page 23-57.
• ‒ Removing and installing engine control unit with protective housing=>Page 23-60.

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

Testing signal wiring

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

• ‒ Rectify any open/short circuit as necessary.

If no fault is found:

• ‒ Renew the Hall sender.