Audi Workshop Service and Repair Manuals

Special tools, testers and workshop equipment required

• ◆ V.A.G 1526 A
• ◆ V.A.G 1527 B
• ◆ V.A.G 1594 A
• ◆ V.A.G 1598/31

Installation position => Overview installation positions - Page 24-5

Notes:

• ◆ Hall sender -G40 is located at rear of left-hand cylinder head (bank 2).
• ◆ Hall sender -G163 is located at front of right-hand cylinder head (bank 1).

Checking actuation

• ‒ Push back rubber grommet of connector for respective Hall sender but leave connector attached.

• ‒ → Connect up voltage tester V.A.G 1527 B between receptacle 2 (Hall sender signal) and receptacle 1 (positive).

Note:

Receptacles are numbered accordingly on the back of the connector.

• ‒ Operate the starter for a few seconds.
• ‒ The LED should flash briefly every second engine revolution.

Note:

Voltage testers with a low current draw continue to glow faintly between impulses from the engine control unit (rather than going out completely) and become much brighter when receiving an impulse.

If LED does not flash:

Checking voltage supply

• ‒ Disconnect connector from relevant Hall sender.
• ‒ Switch on the ignition.

• ‒ → Connect multimeter as follows to measure voltage:

• ‒ Specified value: approx. 5 V.

Checking signal wire

• ‒ → Connect multimeter as follows to measure voltage:

• ‒ Specified value: approx. battery voltage

Checking earth wire

• ‒ Connect multimeter as follows to measure voltage:

• ‒ Rectify any open/short as necessary.

If the specified values are all achieved and the diode test lamp does not flash (measured between contacts 1 and 2 with starter connector attached),

• ‒ Replace relevant Hall sender.

If the specified values are not attained:

Checking wiring between Hall sender and engine control unit.

• ‒ Connect the V.A.G 1598/31 test box to wiring harness leading to engine control unit; the engine control unit should not be connected .

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

Hall sender - G40 (Bank 2)

Hall sender -G163 (Bank 1)

• ‒ Rectify any open/short as necessary.
• ‒ If a trial erasure of the fault memory is followed by the replaced indication of a fault relating to the camshaft sensor (Hall sender) although all previous tests were OK, the following faults are possible:
• ‒ Rotor ring for Hall sender misaligned

Check phase position of Hall sender

• ‒ Connect up vehicle diagnosis, measurement and information system VAS 5051 or fault reader V.A.G 1551 and select engine electronics control unit with "Address word" 01 => Page 01-3.
  When doing this the engine must be running at idle speed

• ‒ Enter "08" to select the function "Reading measured value block" and confirm entry with Q key.

• ‒ Enter "093" to select "Display Group 093" and confirm entry with the Q key.

• ‒ Check specified results for Hall sender.