lock AUDI A4 1997 B5 / 1.G AFC Engine On Board Diagnostic Multiport Fuel Injection Owner's 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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01-238
Display group 044 (Diagnostic conditions for three way catalytic converter diagnosis, bank 1 and bank 2)
Notes:

When the diagnostic conditions are fulfilled (display fields 3 and 4) by using the heated oxygen sensors in front of and
behind the three way catalytic converter, at each start the Engine Control Module (ECM) carries out a diagnosis of the
three way catalytic converter. During this diagnosis, the deterioration rate of the three way catalytic converter is
determined. The deterioration rate of the three way catalytic converter is displayed when display groups 035 and 036 are
displayed. However, this diagnosis is "cross-blocked." That means that before the three way catalytic converter diagnosis
can be evaluated, a result of the heated oxygen sensor diagnosis must be available to the Engine Control Module (ECM).
If a malfunction is stored in DTC memory that affects the heated oxygen sensors in front of or behind the three way
catalytic converter, the heated oxygen sensor diagnosis can not be carried out and the three way catalytic converter
diagnosis can not be evaluated.
If in display group 029, display field 1 the value of the three way catalytic converter diagnosis is not set to "0" during
regeneration of the readiness code, and/or a malfunction is stored in DTC memory that affects the three way catalytic
converter, display group 044 can be used to selectively call the diagnostic conditions (display fields 3 and 4).
If in display group 029, display field 1 the value of the three way catalytic converter diagnosis and the value of the heated
oxygen sensor diagnosis are not set to "0" during regeneration of the readiness code, display group 044, display field 1
can be used to determine whether the three way catalytic converter diagnosis has been carried out inside the engine
control module, but the value of the three way catalytic converter diagnosis under display group 029, display field 1 can
not be set to "0" because the heated oxygen sensor diagnosis has not been carried out.
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01-244
Display group 099 Display
shows Display/specified
value Designation/diagnosis
Basic
setting 99
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
... C
3 = Coolant temperature display group 001, display field 1

-Control OFF
and/or
-Control ON
4 = Oxygen sensor control OFF in "Basic Setting" function 04; Oxygen sensor control
ON in "Read Measuring Value Block" function 08
Notes on display field 4:

For defined troubleshooting, the oxygen sensor control is switched off when display group 099 is selected under "Basic
Setting" function 04, and switched on when display group 099 is selected under "Read Measuring Value Block"function
08. When leaving "Basic Setting" function 04, oxygen sensor control is automatically active again.
You can switch back and forth between "Basic Setting" function 04 and "Read Measuring Value Block" function 08 by
pressing buttons -4- and -8- on the VAG 1551 scan tool.
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01-249

Read Measuring Value Block (scan tool
function 08)


Notes:

Display groups 000-045 and 099 are identical to
the display groups 000-045 and 099 described
with "Basic Setting" function 04.
After "Basic Setting" function 04 is called up,
the ECM initiates the operations described
below. These operations are not carried out
after calling up "Read Measuring Value Block"
function 08.
Operations after calling up "Basic Setting"
function 04:
Constant ignition timing point of 12 BTDC will
be output in idle

Digital idle speed control is blocked
Evaporative Emissions (EVAP) canister purge
regulator valve is closed
A/C compressor is shut off

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01-250

- Connect VAG 1551 scan tool and operate until
display shows "Select function XX" page 01
-
7 .
Rapid data transfer
HELP
Select function XX

Indicated on display
Note:
After the HELP button is pressed, an overview of possible functions is
printed out.
- Press buttons -0- and -8- to select "Read Measuring Value Block"
function 08.
Rapid data transfer
HELP
08 - Read Measuring Value Block

Indicated on display
- Press -Q- button to confirm input.
Read measurin
g value block
HELP
Input displa
y group number XXX

Indicated on display
Note:
After the HELP button is pressed, the procedure for input of the display
group number is printed out.
Note:
Display group number 001 is used as an example to show the input - Input desired display group number according to display group
overview "Basic Setting" function 04, page 01
-150
.
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01-251

- Push buttons -0-, -0- and -1- for display group
number 001. Read measurin
g value block
Q
Input displa
y group number 001

Indicated on display
- Press -Q- button to confirm input.
Read measuring value block
1
1 2 3 4

Display fields 1 through 4 are indicated on the display.
Notes:
To change to another display group, proceed as follows:
Display group
VAG 1551 scan tool
VAG 1552 scan tool
Higher Press -3- button
Press button Lower Press -1- button
Press button Skipped Press -C- button Press -C- button
The values in display fields 1 through 10 are shown in decimal form in
display group 000. The current 3-digit display group number is shown without the first
zero. In display groups 000 to 009, the number is shown without the
first two zeroes. When the printer is switched on, the current display is printed on the
paper strip. Every time the PRINT button is pressed, the current display is printed
out again.
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01-257

Reading readiness code

- Select VAG 1551 "Read Measuring Value Block"
function 08, display group 029 page 01
-249
.

Note:
The readiness code can be displayed with the
VAG 1551 and/or VAG 1552 scan tools, and also
with address word 33, mode 1 (Diagnosis data). Read measuring value block 29 1 2 3 4

Display shows display fields 1 through 4.
Note:
The readiness code is set as soon as all display positions is display field 1
are "0."
If the readiness code is not set: - Read readiness code in display field 1.
Specified value: 000_00_0
-
Press button.- Press buttons -0- and -6- to select "End Output" function 06, and press
-Q- button to confirm input.
- Generate readiness code page 01
-258
.
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01-260

Step 2: System readiness checking and
creating

- Select VAG 1551 "Read Measuring Value Block"
function 08, display group 29 page 01
-249
.
Read measuring value block 29 1 2 3 4

Display shows display fields 1 through 4. Specified values:
Display field 1: 111_01_1 (readiness code)Display field 2: 00000000 (trip status display)Display field 3: 0Display field 4: 0
-
Press button.
Read measuring value block Input displa
y group number XXX

Indicated on display
- Push buttons -0-, -0- and -1- to input display group number 001.
- Press -Q- button to confirm input.
Read measuring value block 1 1 2 3 4

Display shows display fields 1 through 4.
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01-263

Step 4: Checking readiness code

- Select VAG 1551 "Read Measuring Value Block"
function 08, display group 29 page 01
-249
.
Read measuring value block 29 1 2 3 4

Display shows display fields 1 through 4. Specified values:
Display field 1: 000_00_0 (readiness code)Display field 2: 111_01_1 (trip status display)Display field 3: 0Display field 4: 0
-
Press button.
- Press buttons -0- and -6- to select "End Output" function 06, and press
-Q- button to confirm input.
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