Checking idling switch -F60 and full throttle switch -F81 — AUDI

Special tools and workshop equipment required

V.A.G 1501
V.A.G 1526 A
V.A.G 1594 A
V.A.G 1598 A
V.A.G 1598/3
VAS 5051 with VAS 5051/1 and VAS 5051/2

or

V.A.G 1551 with V.A.G 1551/1
Feeler gauge

Fitting location => Fitting locations overview, Page
25-5

Notes:

Idling switch -F60 and full throttle switch -F81 have a common connector.
Vehicles with automatic gearbox have the throttle valve potentiometer -G69 in addition to idling switch -F60 and full throttle switch -F81. The switches are integrated into the throttle valve potentiometer housing, but have their own connector

Test sequence

Read measurement block 0
⇒
1
2
3
4
5
6
7
8
9
10
Read measured value block, display group 000, ignition switched on =>Page
01-44
.
Check display in display zone 9.
Specification: 5

Slightly open throttle valve.
The value must drop to 4
Window between throttle flap stop and adjustment screw 0.15 ... 0.50 mm (measured with feeler gauge)

Push throttle flap lever into full throttle.
The value must increase to 6.

If the display does not change:

Checking idling switch -F60

Unplug connector from throttle valve switch.

Note:

Idling switch -F60 and full throttle switch -F81 have a common connector.

Connect test lead V.A.G 1501 to throttle valve switch -arrow-.
Connect multimeter for resistance measuring between contacts 1 and 2 of test lead V.A.G 1501.
Specification: 0 ω

Slightly open throttle valve.
Specification: ∞ω (no flow)

Let throttle valve return slowly to closed position and check starting point of idling switch with a feeler gauge between throttle valve stop and stop bolt.
Specification: 0 ω with window 0.15 ... 0.50 mm

If the specified values are not obtained:

Replace throttle valve part.

Check full throttle switch -F81

Connect multimeter for resistance measurement between contacts 2 and 3 of test lead V.A.G 1501.
Specification: ∞ω (no continuity)

Push throttle valve lever into full throttle.
Specification: 0 ω

If the specified values are not obtained:

Replace throttle valve part.

If the specified values are attained:

Checking wiring

Connect up multimeter as follows to measure voltage.

Connector / Contact · Measure to
2 · Battery positive

Specification: approx. battery voltage

If the specification is not obtained:

Eliminate open circuit or short circuit using the current flow diagram.

If the specification is obtained:

With the ignition switched off, use adapter V.A.G 1598/3 to connect test box V.A.G 1598 A to plug connection of engine control unit (control unit remains disconnected) => Page
25-9
.

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
1 · 28
3 · 32

Rectify any open/short circuit as necessary.

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