display AUDI A4 1996 B5 / 1.G AFC Engine On Board Diagnostic Multiport Fuel Injection Workshop Manual

01-223
Display group 035 (Three way catalytic converter diagnosis, bank 1)
Display group 036 (Three way catalytic converter diagnosis, bank 2)
Notes on display groups 035 and 036:

If the value of the three way catalytic converter diagnosis is not set to "0" in display group 029, display field 1 during
regeneration of the readiness code and/or there is a malfunction in DTC memory that relates to the three way catalytic
converter, display groups 035, 036 and 044 are used to carry out a selective diagnosis.
At each start, when the diagnostic conditions are fulfilled ( display group 044) the Engine Control Module (ECM) checks
the deterioration rate of the three way catalytic converter by the heated oxygen sensors in front of and behind the three
way catalytic converter. Display fields 1 and 2 display the largest and smallest rate of deterioration of all the diagnoses carried out. If a higher or
lower rate of deterioration is recognized at the next diagnosis, the current value is overwritten.
The number of three way catalytic converter diagnoses (display field 3) is incremented each time a diagnosis is carried
out, no matter whether the diagnosis is considered OK or not OK.
If the rate of deterioration is recognized as OK during the first diagnosis, the number of three way catalytic converter
diagnoses is increased by the value of "1" and the diagnosis is discontinued.
If the limit value of 50% is exceeded, the diagnosis is recognized as not OK. In this case, the rate of deterioration
continues to be checked, while the number of three way catalytic converter diagnoses is incremented with each additional
diagnosis.
Display field 4 shows the current rate of deterioration recognized at the last diagnosis.
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The display values are only reset by erasing the DTC memory. Selective observation time periods can be defined by
resetting the display values.
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01-224

Display shows
Display specified value
Designation/diagnosis
Basic setting 35
1 2 3 4 0 - 100% 1 = Maximum deterioration rate, bank 1 (limit value: 50%)
0 - 100% 2 = Minimum deterioration rate, bank 1 (limit value: 50%)
0 - 255% 3 = Number of three way catalytic converter diagnoses, bank 1
0 - 100% 4 = Last calculated deterioration rate, bank 1 (limit value: 50%) Display shows
Display specified value
Designation/diagnosis
Basic setting 36
1 2 3 4 0 - 100% 1 = Maximum deterioration rate, bank 2 (limit value: 50%)
0 - 100% 2 = Minimum deterioration rate, bank 2 (limit value: 50%)
0 - 255 3 = Number of three way catalytic converter diagnoses, bank 2
0 - 100% 4 = Last calculated deterioration rate, bank 2 (limit value: 50%)
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01-225
Display group 037 (Sensor wheel learning value)
Notes:

In order to be able to monitor and/or record combustion misfiring, a sensor wheel is necessary. The flywheel (starter ring
gear) is used as the sensor wheel. The flywheel is checked for mechanical damage after each start, i.e. specified
tolerances must not be exceeded.
Small malfunctions in the flywheel (e.g. teeth worn) are compensated by learning values. If greater damage is recognized,
the malfunction "engine speed sensor wheel tooth error recognized" is stored in the DTC memory.
The sensor wheel is tested during a deceleration fuel shut-off in the engine speed range from 2200 -4000 RPM. In order to
get a result, the length of the deceleration fuel shut off must be approx. 10 sec.
Display shows
Display specified value
Designation/diagnosis
Basic setting 37
1 2 3 4 X X 1 = Sensor wheel condition and/or result
______ 2 = ________________________
______ 3 = ________________________
______ 4 = ________________________
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01-226
Note on display field 1 X
X
Meaning of 2-digit "Sensor Wheel Status and/or Result"

1 = Sensor wheel result
Value "0" = Sensor wheel OK
Value "1" = Sensor wheel not OK

2 =Sensor wheel status
Value "0" = Sensor wheel not checked since start of trip
Value "1" = Sensor wheel checked since start of trip
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01-227
Display group 038 (Current data on combustion misfiring recognition)
Notes:

If the malfunctions "Combustion misfiring recognized" and "Cyl. X Combustion misfiring recognized"are stored in DTC
memory, display groups 031, 037, 038 and 039 are used to carry out a selective diagnosis.
Using display group 038, after a repair you can drive again in the load and engine speed range that was displayed in
display group 031 as the combustion misfiring range and evaluated again.
Display shows
Display/specified value
Designation/diagnosis
Basic setting 38
1 2 3 4 ... RPM 1 = Momentary engine speed
__._% 2 = Momentary engine load
0 - 255 3 = Combustion misfiring per 1000 RPM (1000th revolution interval)
X X X X X X 4 = Combustion misfiring including in this "1000th revolution interval"
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01-228
Note on display field 4:
Value "0" = Cylinder without combustion misfiring
Value "1" = Cylinder with combustion misfiring X
X
X
X
X
X
Meaning of 6-digit display

1 = Cylinder 1

2 = Cylinder 2

3 = Cylinder 3

4 = Cylinder 4

5 = Cylinder 5

6 = Cylinder 6
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01-229
Display group 039 (Statistical data on combustion misfiring recognition)
Notes:

Combustion misfiring recognition always occurs in relation to 1000 RPM (1000th revolution interval).
The display values are reset only be erasing DTC memory. Selected observation time periods can be defined by resetting
the display values.
Display
shows Display specified
value Designation/diagnosis
Basic setting
39
1 2 3 4 0 - 255 1 = Highest number of instances of combustion misfiring within 1000 RPM
0 - 255 2 = Number of "1000the revolution intervals" with 30 and/or more than 30 instances
of combustion misfiring
0 - 255 3 = Number of "1000th revolution intervals" with 5 and/or more than 5 instances of
combustion misfiring
X X X X X X 4 = Cylinders involved in combustion misfiring during the entire statistics period
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01-230
Note on display field 2:
The display shows the number of "1000th revolution intervals" in which 30 or more than 30 instances of combustion misfiring
were recognized.
Note on display field 3:
The display shows the number of "1000th revolution intervals" in which 5 or more than 5 instances of combustion misfiring
were recognized.
Note on display field 4:
Value "0" = Cylinder without combustion misfiring
Value "1" = Cylinder with combustion misfiring X
X
X
X
X
X
Meaning of 6-digit display

1 = Cylinder 1

2 = Cylinder 2

3 = Cylinder 3

4 = Cylinder 4

5 = Cylinder 5

6 = Cylinder 6
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01-231
Display group 040 (Heating current of oxygen sensors in front of and behind three way catalytic converter) Display
shows Display specified value
Designation/diagnosis
Basic setting
40
1 2 3 4 At cold start, greater than 3 A after approx. 40 sec: 0.7 -
1.0 A 1 = Heating current, bank 1, heated oxygen
sensor 1
2 = Heating current, bank 2, heated oxygen
sensor 1
At cold start, greater than 3 A after approx. 80 sec: 1.2 -
1.4 A 3 = Heating current, bank 1, heated oxygen
sensor 2
4 = Heating current, bank 2, heated oxygen
sensor 2 Notes:

The current values specified apply only at when battery positive voltage (B+) is 12-14 volts display group 001, display
field 4. The heating of the heated oxygen sensors in front of the three way catalytic converter is switched on with the fuel pump
relay, i.e. immediately at engine start.
The heating of the heated oxygen sensors behind the three way catalytic converter is not switched on immediately at
engine start, but only when the calculated exhaust gas temperature in the three way catalytic converter exceeds 308 C
(586 F) display group 044, display field 2. In order to reach an exhaust gas temperature of 308 C (586 F) in the three
way catalytic converter after a cold start, the car must be driven about 20 sec. with an increased engine speed of 2500
RPM.
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