Audi Workshop Service and Repair Manuals

Special tools and workshop equipment required

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

Installation position => Installation position overview - Page 24-5

• ‒ Before carrying out the test, make sure that the sender is correctly installed and firmly seated.

Checking internal resistance

• ‒ Pull grey 3-way connector off engine speed sender.

• ‒ → Connect multimeter between contacts 1 and 2 on sender to measure resistance.
• ‒ Specification: approx. 1 kω

If the specification is not obtained:

• ‒ Fit a new engine speed sender.
• ‒ Connect multimeter between contacts 1 and 3 and 2 and 3 on sender to measure resistance.
• ‒ Specification: ∞ ω (no continuity)

If specified values are not obtained:

• ‒ Replace engine speed sender.

Checking wiring

• ‒ → With the ignition switched off, use adapter V.A.G 1598/11 to connect test box V.A.G 1598 A to connector B only of engine control unit (control unit remains disconnected) .

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

• ‒ Rectify any open/short circuit as necessary.

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

If no wiring fault is detected:

• ‒ Remove starter:

=> Electrical system; Repair group 27; Removing and installing starter

• ‒ Slowly crank engine and check ring gear for concentricity and broken/damaged teeth; replace if necessary

If no fault is found:

• ‒ Replace engine control unit => Page 24-12.

Adjusting holder for engine speed sender

Notes:

• ◆ The holder for the engine speed sender can be moved in slots. The position is set at the factory and must not be altered.

• ◆ If the bolts have been accidentally slackened off and the holder moved, carry out the adjustment as follows:

Special tools and workshop equipment required

• ◆ Special tool 3242

• ◆ Special tool 3308

Work sequence

• ‒ → Move crankshaft in direction of engine rotation to cylinder TDC mark (notch -B- opposite mark -A-).
• ‒ Unscrew ignition timing sender -G4 from the cylinder block on the left.

Note:

TDC hole is located exactly behind the sender in the crankshaft (can be felt).

• ‒ → Screw crankshaft clamping bolt 3242 into threaded hole where plug has been removed, and tighten.
• ‒ Unscrew heat shield over engine speed sender.
• ‒ Remove engine speed sender and unfasten holder.

• ‒ → Insert special tool 3308 in place of sender, so that it engages in ring gear.
• ‒ Screw on holder.

The remaining installation steps are carried out in the reverse sequence: