Checking idling switch -F60 — AUDI

Special tools,
testers and equipment required

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

Notes:

The idling switch is located in the throttle valve potentiometer.
Checking operation=> Reading measured value block display group 002, Page
01-104
.

Test requirements:

Throttle cable setting OK

=> Fuel Supply - Petrol Engines; Repair Group 20; Servicing Throttle Control - FWD and 4WD;Adjusting throttle cable - vehicles with 6-cylinder-naturally aspirated engine
Fuel Supply - Petrol Engines
Servicing Throttle Control - FWD and 4WD
Adjusting throttle cable - vehicles with 6-cylinder-naturally aspirated engine

Test sequence

Remove noise insulation.
Pull connector off throttle valve potentiometer.

Connect multimeter between contacts 4 and 6 to measure resistance.
Specification: 0 ω

Open throttle valve slightly.
Specified value: ∞ ω

If the specifications are not obtained:

Adjust idling switch =>Page
24-104
.

If the specifications are still not attained:

Renew throttle valve potentiometer.

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 A only of engine control unit (control unit remains disconnected) => Page
24-17
.

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

Connector / Contact · Test box V.A.G 1598 A / Socket
6 · 49

Rectify short circuit or open circuit if necessary.

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

Note:

Use only gold-plated contacts when repairing the contacts in the plug connectors for the knock sensors.

If no fault in wire is detected:

Connect voltage tester V.A.G 1527 B as follows:

Connector / Contact · Measure against
4 · Battery positive

The LED should light up.

If the LED does not light up:

Check wiring between contact 4 of connector and earth connection in wiring harness on right of engine compartment for open circuit and repair if necessary.

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

Note:

When installing noise insulation, pay particular attention to proper positioning of noise insulation at throttle valve unit so as to avoid unmetered air.

By way of verification, check output voltage of air mass meter => Reading measured value block, display group 002, Page
01-104
.

Adjusting idling switch

Remove the throttle valve unit.
Slacken off the bolts of throttle valve potentiometer.

Turn throttle valve potentiometer in direction of arrow until a stop is felt.

Note:

Do not move the throttle valve.

Tighten bolts of throttle valve potentiometer in this position.
Check adjustment => Page
24-101
.