octane AUDI A4 1995 B5 / 1.G AFC Engine On Board Diagnostic Multiport Fuel Injection Workshop Manual

01-194
Display group 012 Display shows
Specified display value
Designation
Basic setting 12
1 2 3 4 ... RPM 1 = Momentary engine speed Display group 003, display field 1 ... % 2 = Momentary engine load Display group 003, display field 2 First map or second map 3 = Ignition timing point map switching

_._ crankshaft
4 = Ignition timing pt. retard by knock control (average of all cyl.)
Notes on display field 3:
The ignition timing point map switching is selected by knock control:

First map = Ignition timing point - basic map (98 octane)
Second map = Ignition timing point - map with reduced ignition angles (95 octane)
The ignition timing point difference between the first map and the second map is approx. 3 crankshaft. If an ignition timing
point retarded by approx. 4 crankshaft is recognized (display field 4), the second map is selected Display groups 013 and
014 for more exact evaluation.
The second ignition timing point map is selected:

If there is poor fuel quality (less than 95 RON)
If there are abnormal engine noises (subassemblies loose)
Pa
ge 273 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1

Loose subassemblies
If there are high ignition timing point retarding values on all six cylinders (banks 1 and 2), the car has been filled with fuel
having low octane (less than 98 RON).
Pa
ge 277 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1