Testing idling speed switch — AUDI

AJG ALF
Note:

Idling speed switch -F60 is located in throttle valve control part -J338.

Connect fault reader V.A.G 1551 (V.A.G 1552) and select engine electronics control unit with the "Address word" 01. When doing this the ignition must be switched on.
(Connecting fault reader and selecting engine electronics control unit => Page
01-3
.)

Rapid data transfer
HELP
Select function XX
Indicated on display:

Press keys 0 and 4 for the function "Introduction of basic setting" and confirm entry with Q key.

Basic setting
Q
Enter display group number
XXX
Indicated on display:

Press keys 0, 5 and 4 to select Display Group 54 and confirm entry with Q key.

Basic setting 54
⇒
1
2
3
4
Indicated on display:

Check display values for idling speed switch (display zone 2).

Display zones
1 · 2 · 3 · 4
Display Group 54: testing idling speed switch
Display · xxxx rpm · Text · xx <° · xx <°
Indicates · Engine speed · Operating status · Throttle valve angle · Throttle valve positioner angle
Range · min.: 700 rpm / max.: 2550 rpm · Idling / Part throttle / Full throttle / Overrun cut-off / Enrichment · min.: 1 <° / max.: 90 <° · min.: 1 <° / max.: 20 <°
Specification · 0 rpm · Idling · --- · ---
Note · Open throttle valve briefly (idling speed switch should open and close); display should change back to "Idling". / If readout does not match specification, test idling speed switch / => Page . 24-105

Electrical test of idling speed switch

Switch ignition off.
Connect test box V.A.G 1598/22 to wiring harness for engine control unit =>Page
24-21
.
Measure resistance between contacts 67 and 69 using hand-held multimeter V.A.G 1526.

Specification: Continuity (throttle valve closed)

Open throttle slightly.

Specification: No continuity (idling speed switch should open)

If the specification is not attained:

Detach connector -1- from throttle valve control part -2-.

Test for open circuit in wiring between 8-pin connector and test box.

8-pin connector on wiring harness, contact · Test box V.A.G 1598/22, socket
3 · 69
7 · 67

Resistance in wiring: max. 1.5 ω

Rectify any open circuits.
Test for short circuits between wires on 8-pin connector using current flow diagram.

8-pin connector on wiring harness, contact · Test box V.A.G 1598/22, socket
7 · 69

Specification: infinity ω(open circuit)

If no wiring faults are detected:

Check the throttle valve for dirt or stiffness and clean if necessary.
Repeat adaption of throttle valve control part
=> Page
24-98
.

If the adaption of the throttle valve control part cannot be started or cannot be successfully completed:

Disengage throttle cable.
Repeat adaption of throttle valve control part
=> Page
24-98
.
If it is still not possible to start or successfully complete the adaption process, renew the throttle valve control part.