Checking signal from clutch pedal switch F36 . — VW

Checking signal from
clutch pedal switch
F36
.
Function
The
clutch pedal switch
F36
informs the control unit whether the clutch is engaged or disengaged. This prevents the engine from juddering on disengaging and engaging the clutch.
Special tools and workshop equipment required
Hand multimeter
V.A.G 1526C
or
multimeter
V.A.G 1715
Fault reader
V.A.G 1551
or
vehicle system tester
V.A.G 1552
with
diagnosis cable
V.A.G 1551/3
Adapter set
V.A.G 1594C
Adapter cable, 121-pin
V.A.G 1598/31
Current flow diagram
Test prerequisites
Fuses must be OK.
The battery voltage must be at least 11.5 V.
Test procedure
Connect
fault reader
V.A.G 1551
or
vehicle system tester
V.A.G 1552
and select engine electronics control unit with
“address word 01”
. The ignition must be switched on for this purpose. (Connecting
fault reader
V.A.G 1551
and selecting engine electronics control unit
Chapter
).
Indicated on display:
Rapid data transfer HELP
Select function XX
Press keys
0
and
8
for function
“Read measured value block”
and confirm entry with
Q
key.
Indicated on display:
Read measured value block
Input display group number XXX
Press keys
0
,
0
and
6
for
“Display group number 6”
and confirm entry with
Q
key.
Observe display in display zone 2.
Specification: 0 0 0
Read measured value block 6 ->
0 km/h 0 0 0 000000 255
Left display =
clutch pedal switch
F36
Operate clutch pedal. The left display must change to 1.
Read measured value block 6 ->
0 km/h 1 0 0 000000 255
Release clutch pedal slowly back rest position.
Left display must change from 1 to 0 again.
Read measured value block 6 ->
0 km/h 0 0 0 000000 255
Press
→
key.
Press keys
0
and
6
for function
“End output”
and confirm entry with
Q
key.
Switch off ignition.
If the display does not change:
Remove cover in footwell (driver side).
Pull 2-pin connector off
clutch pedal switch
F36
.
Measure resistance at switch contacts.
Specification: Clutch not depressed: Max. 1.5 Ω, clutch depressed: ∞ Ω∼(no continuity)
If the specifications are not attained:
Renew
clutch pedal switch
F36
.
If the specifications are attained:
Connect
adapter cable, 121-pin
V.A.G 1598/31
to control unit wiring harness. The engine control unit remains disconnected.
Check wiring between
adapter cable, 121-pin
V.A.G 1598/31
and connector for open circuit referring to current flow diagram. Contact 1 + socket 1 Contact 1 + socket 2 Contact 2 + socket 66.
Cable resistance: max. 1.5 Ω.
Also check wiring for short to one another, short to vehicle earth and short to battery positive.
Specification: ∞ Ω.
If no fault in lines is detected:
Renew engine control unit
Chapter
.