Checking idling switch: VW 2.0 (ABF)

Checking on Digifant 3.0 (▸ 09.94)

(Interrogate control unit version => Page
01-4
; Connecting fault reader V.A.G 1551 and selecting engine electronics control unit).

Special tools, testers and auxiliary items

Test box V.A.G 1598/18
Hand multimeter V.A.G 1526 or multimeter V.A.G 1715

Adapter set V.A.G 1594
Current flow diagram

Test sequence

Connect test box V.A.G 1598/18 to control unit wiring loom.
Measure resistance between sockets 21+33.
Specification: Max. 1.5 ω
Open throttle valve. The resistance must increase to
∞ ω.

If the specifications are not attained:

Check wiring between test box and 2 pin connector for open circuit according to current flow diagram.
Contact 1+socket 21
Contact 2+socket 33
Wire resistance: Max. 1.5 ω

Checking on Digifant 3.2 (10.94▸)

(Interrogate control unit version => Page
01-4
; Connecting fault reader V.A.G 1551 and selecting engine electronics control unit).

Special tools, testers and auxiliary items

Fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3
Test box V.A.G 1598/18
Hand multimeter V.A.G 1526 or multimeter V.A.G 1715
Adapter set V.A.G 1594
Current flow diagram

Test sequence

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 engine must be running at idling speed.
(Connecting fault reader and selecting engine electronics control unit => Page
01-4
.)

Rapid data transfer
HELP
Select function XX
Indicated on display:

Input 08 for "Read measured value block" function and confirm with Q key.

Read measured value block
HELP
Input display group number XX
Indicated on display:

Input 01 for "Display group number" and confirm with Q key.

Read measured value block
1
⇒
1
2
3
4
Indicated on display:
(1...4 = Display zones)

Observe 4th position from left in display zone 4 -8 digit number block-.
Specification: 00000000
Open throttle valve slightly. The display at position 4 must jump to 1
Display: 00010100

If the specifications are not attained:

Display · Cause · Continuation of check
Always 0 · Short to earth · => Page 24-65
Always 1 · Open circuit or short to positive · => Page 24-66

Continuation of check when display = always 0:

Pull 2 pin connector -1- off idling switch (F60) -2-.

Display 1:

Replace idling switch -2.

Display 0:

Press ⇒key.
Input 06 for "End output" and confirm with Q key.
Switch off ignition.
Pull connector off Digifant control unit.
Check wiring to control unit at 2 pin connector contact 1 for short to wire contact 2 and to vehicle earth.

If no fault in wire is detected:

Renew Digifant control unit (J169)
=>Page
24-8
, item
11
.

Continuation of check when display = always 1:

Pull 2 pin connector -1- off idling switch (F60) -2-.
Bridge connector contacts with aux. cables from V.A.G 1594 and observe display.

Display 0:

Replace idling switch -2.

Display 1:

Press ⇒key.

Input 06 for "End output" and confirm with Q key.
Switch off ignition.
Connect test box V.A.G 1598/18 to control unit wiring loom.

Check wiring between test box and 2 pin connector for open circuit according to current flow diagram.
Contact 1+socket 21
Contact 2+socket 33
Wire resistance: Max. 1.5 ω

If no wiring fault is detected:

Renew Digifant control unit (J169)
=>Page
24-8
, item
11
.