Audi Workshop Service and Repair Manuals

Special tools, testers and workshop equipment required

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

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

Note:

The engine speed sender is a combined speed sender and reference mark sender. The engine cannot be started without a signal from the -G28 engine speed sensor. If the signal from the -G28 engine speed sensor fails while the engine is running, the engine will cut out immediately.

Test sequence

• ‒ Before carrying out the test, make sure that the sender is correctly installed and firmly seated.
• ‒ Disconnect connector for engine speed sensor (identification: grey connector).

• ‒ → Connect multimeter between contacts 2 and 3 to measure resistance.
• ‒ Specified value: 730 ...1000 ω

Note:

The resistance figure for the engine speed sensor is associated with a temperature of 20 oC.

The resistance increases with increasing temperature.

If the specified value is not attained:

• ‒ Fit a new engine speed sender.

If the specified value is attained:

• ‒ → Connect multimeter between contacts 2 and 1 (screen) and 3 and 1 (screen) to measure resistance.
• ‒ Specified value: each case ∞ ω (no continuity)

If the specified value is not attained:

• ‒ Fit a new engine speed sender.

If the specified value is attained:

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

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

• ‒ Rectify any open/short as necessary.

If no wiring fault is detected:

• ‒ Replace engine control unit => Page 24-23.