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

01-216
Display group 030 (EVAP system diagnosis)
Notes:

Display group 030 is only considered on vehicles with sensor for EVAP canister -G172-.
If the value of the EVAP throughput 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 EVAP system, display group 030 is
used to carry out a selective diagnosis.
Since the EVAP system is automatically shut off during "Basic Setting" function 04, display group 030 can only be
evaluated using "Read Measuring Value Block" function 08.
When diagnostic conditions are fulfilled, the Engine Control Module (ECM) checks the EVAP system at each start with the
help of the sensor for EVAP canister -G172-. The pressure between the EVAP canister and EVAP canister purge
regulator valve is measured with the sensor for EVAP canister -G172-.
The diagnostic conditions are only fulfilled during a drive of approx. 1-1/2 to 5 minutes at 80-100 km/h (50-63 mph) with
manual transmission in 4th or 5th gear, or automatic transmission selector lever in "D" position, preferably in 4th gear. If
the diagnostic conditions are fulfilled, the diagnosis is active. To get the diagnosis results, you have to drive approx. 1-1/2
to 5 minutes under the diagnostic conditions, while the pressure has to be measured with closed EVAP canister purge
regulator valve. First, the pressure must be measured with the valve closed. You can get the valve to close most easily by
having a preceding deceleration fuel shut-off. If there are problems in shutting the EVAP canister purge regulator valve by
deceleration fuel shut-off, it can also be shut by running display group 030 in "Basic Setting" function 04. Then the
pressure has to be measured again in "Read Measuring Value Block" function 08 with valve fully open.
The diagnosis is recognized as OK if the EVAP system low pressure measured in display field 1 is greater than the actual
calculated EVAP system minimum low pressure in display field 2.
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01-217

Display shows
Display/specified value
Designation/diagnosis
Basic setting 30
1 2 3 4 -- mbar 1 = Currently measured EVAP system under pressure
-- mbar 2 = Currently calculated EVAP minimum under pressure
0 - 99% 3 = Duty cycle (triggering) EVAP canister purge regulator valve
0% = completely open
99% = completely closed
X X X X X 4 = Diagnosis status and/or result Note on display field 2:
An under pressure calculated from the momentary throughput of the Mass Air Flow (MAF) sensor (intake air mass) is
displayed.
Notes on display field 4:
0 1 X X X = Diagnosis carried out, diagnosis OK
1 0 X X X = Diagnosis carried out, malfunction recognized, diagnosis is continued
The display positions marked with X do not have to be fulfilled to evaluate the diagnostic status and/or result.
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01-218

X
X
X
X
X
Meaning of 5-digit "Diagnostic Status and/or Result"

1 = Diagnostic conditions during test drive (approx. 1-1/2 to 5 minutes at 80-100 km/h (50-63 mph) with
manual transmission in 4th or 5th gear, or automatic transmission selector lever in "D" position, preferably
in 4th gear)
Manual transmission: 8 - 45%
Automatic Transmission: 8 - 20%
Value "0" = Diagnostic conditions not fulfilled
Value "1" = Diagnostic conditions fulfilled
Engine speed: 1600 RPM - 4500 RPM ( display group 003) Intake air through Mass Air Flow (MAF) sensor: 22 g/sec - 56 g/sec ( display group 019) Throttle angle: ( display group 003)

2 = Pressure measurement w/EVAP canister purge regulator valve completely closed
Value "0" = Pressure measurement not completed yet
Value "1" = Pressure measurement completed

3 = Pressure measurement w/EVAP canister purge regulator valve completely open
Value "0" = Pressure measurement not completed yet
Value "1" = Pressure measurement completed

4 = Diagnostic status
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01-220
Display group 032 [Longest and shortest flank rise and flank fall time (response time) of the voltage signal for bank 1
heated oxygen sensor 1]
Display group 033 [Longest and shortest flank rise and flank fall time (response time) of the voltage signal for bank 2
heated oxygen sensor 2]
Display group 034 [Number of flank rise and flank fall tests]
Notes on display group 032, 033 and 034:

If the value of the heated oxygen sensor 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 the DTC memory that relates to the heated oxygen sensors, display
groups 032, 033 and 034, as well as display groups 042 and 043 are used to carry out a selective diagnosis.
The Engine Control Module (ECM) checks the flank rise and/or flank fall time (response time) of the voltage signal for the
heated oxygen sensors in front of three way catalytic converter after every start with diagnostic conditions fulfilled
display group 042. The display values for display group 034 are incremented with each diagnosis that is carried out, whether the diagnosis is
recognized as OK or not OK. If the flank rise and/or flank fall time is recognized as OK during the first diagnosis, the
display values are increased by the value "1" and the diagnosis is discontinued. If the limit values (flank rise time 90
ms/flank fall time 85 ms) are exceeded, the diagnosis is recognized as not OK. The flank rise and/or fall times now
continue to be checked, whereby the display values are incremented with each additional diagnosis. However, the limit
values can also be exceeded because combustion misfiring is recognized. In this case, the malfunction "Bank X probe Y
signal too slow" is not stored in DTC memory, but" Cyl. x Combustion misfiring recognized" is stored.
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01-221

Display groups 032 and 033 show the highest and lowest flank rise and/or flank fall time for all tests carried out (number of
tests display group 034). If during one of the next tests, a higher or lower diagnosis time is recognized, the current value is overwritten. With
diagnostic conditions fulfilled, display group 043 shows the current flank rise and flank fall times. After diagnosis is ended,
the diagnosis times shown are those that were recognized at the last diagnosis that was carried out.
The display values are only reset by erasing the DTC memory. Selective observation times can be defined by resetting the
display values.
Display shows
Display specified value
Designation/diagnosis
Basic setting 32
1 2 3 4 0.0 - 260.0 ms 1 = Highest flank rise time, bank 1, heated oxygen sensor 1
(limit value: 90 ms)
0.0 - 260.0 ms 2 = Lowest flank rise time, bank 1, heated oxygen sensor 1
(limit value: 90 ms)
0.0 - 260.0 ms 3 = Highest flank fall time, bank 1, heated oxygen sensor 1
(limit value: 100 ms)
0.0 - 260.0 ms 4 = Lowest flank fall time, bank 1, heated oxygen sensor 1
(limit value: 100 ms)
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01-222

Display shows
Display specified value
Designation/diagnosis
Basic setting 33
1 2 3 4 0.0 - 260.0 ms 1 = Highest flank rise time, bank 2, heated oxygen sensor 1
(limit value: 90 ms)
0.0 - 260.0 ms 2 = Lowest flank rise time, bank 2, heated oxygen sensor 1
(limit value: 90 ms)
0.0 - 260.0 ms 3 = Highest flank fall time, bank 2, heated oxygen sensor 1
(limit value: 100 ms)
0.0 - 260.0 ms 4 = Lowest flank fall time, bank 2, heated oxygen sensor 1
(limit value: 100 ms) Display shows
Display specified value
Designation/diagnosis
Basic setting 34
1 2 3 4 0 - 255 1 = Number of flank rise tests, bank 1, heated oxygen sensor 1
0 - 255 2 = Number of flank fall tests, bank 1, heated oxygen sensor 1
0 - 255 3 = Number of flank rise tests, bank 2, heated oxygen sensor 1
0 - 255 4 = Number of flank fall tests, bank 2, heated oxygen sensor 1
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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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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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01-231
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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