Skoda OCTAVIA MK1 Service Manual page 178

signal is generated by two gaps at the sensor rotor.
The trim of the hall sender at the camshaft is separated by 180°, i.e if the trim is located in
t the air gap of the hall sender after half a turn, the trim leaves the air gap again after the
next half turn of the camshaft.
As of the moment when the trim drives into the air gap (signal change from - to +), i.e the
t
trim leaves the air gap (signal change from + to -), this is the start of the synchronization.
As soon as the sender recognizes the gap at the sensor rotor, the engine control unit begins
to count the teeth of the sensor rotor. After 26 to 30 teeth, the hall sender signal at the
t camshaft must change from - to +. (At this moment the trim drives into the air gap.) After
86 to 90 teeth (the crankshaft makes at this moment its second turn) the hall sender signal
must change from + to - (at this moment the trim leaves the air gap).
If no signal change occurs in the area of the teeth, as described above, this is an indication
t
that the toothed belt is skipped.
Display group 057 (vehicles with air conditioning system and high pressure switch -G65- as of
08.98):
l Engine runs in idling speed
Reading measured value
block 57
xxx rpm xxx rpm
1 2
Idling speed
→ ← Readout on display
Text x
x
3 4 ← Display fields
Signal output from the pressure sender
at:
t Compr. OFF
t Compr. ON
Operating state of AC compressor (ON,
OFF)
Nominal speed at idling when AC compressor is
switched off
nominal speed at idling when AC compressor is
switched on
178
Specificatio Analysis
n
1...5 % → Ancho
10...70 % r
Compr. ON -
Compr. OFF
-
760....880
rpm
800...880
rpm
- → Chapt
er