Audi Workshop Service and Repair Manuals

Special tools,
testers and equipment required

• ◆ V.A.G 1526 A
• ◆ V.A.G 1527 B
• ◆ V.A.G 1594 A
• ◆ V.A.G 1598 A
• ◆ V.A.G 1598/11

Fitting location => Fitting locations overview, Page 24-6

Checking power supply

• ‒ Pull connector off Hall sender.
• ‒ → Connect multimeter to contacts 1 (positive) and 3 (earth) to measure voltage.
• ‒ Switch the ignition on.
• ‒ Specification: min. 9 V

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) .

• ‒ → Check the following wires for open circuit and short to positive or earth (or short circuit to each other):

• ‒ Rectify short circuit or open circuit if necessary.

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

• ‒ If the wiring is OK, fit a new engine control unit => Page 24-20.

Checking operation

Note:

To check the operation of the Hall sender, unplug the 4-way connector from the output stage and interrogate fault memory after performing functional check.

Test requirements:

• ● Power supply of Hall sender OK; checking => Page 28-40.

• ‒ Slide back rubber grommets on connector for Hall sender but leave connector plugged in.
• ‒ Connect up voltage tester V.A.G 1527 B between receptacle 2 (Hall sender signal) and receptacle 1 (positive).

Note:

The connector contacts are numbered on the back of the connector.

• ‒ Operate the starter for a few seconds.

• ‒ The LED should flash briefly on alternate engine revolutions (i.e. once every two revolutions).

If the LED lamp does not flash:

• ‒ Switch off ignition.
• ‒ Pull connector off Hall sender.
• ‒ → 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 24-17.

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

• ‒ Rectify short circuit or open circuit if necessary.

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

• ‒ If there are no open circuits or short circuits, reconnect engine control unit to engine wiring harness.

• ‒ → Connect multimeter between contacts 2 and 3 to measure voltage.
• ‒ Switch the ignition on.
• ‒ Specification: min. 4 V

If the specification is not obtained:

• ‒ Fit a new engine control unit => Page 24-20.

If the specification is obtained:

• ‒ Fit a new Hall sender.