display AUDI A4 1998 B5 / 1.G ATQ Engine Readiness Code Owner's Guide

01-104
If specified value "Cat B1 OK" is obtained:

- Press -C- button.Basic Settin
g
Q
Input display group number XXX

When indicated on display:
- Press buttons -0-, -4- and -7- to select "display group number 047" and
press -Q- button to confirm input.
System in Basic Setting 47
1
2
3
4

When indicated on display:
- Check specified value in display field 4.
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01-105


Display fields

1 2 3 4
Display group 047: Diagnostic of catalytic converter (bank 2)
Display xxxx/min
xxx C
x.x s
---
Indicated Engine
speed
(RPM) Exhaust
temperature Catalytic
converter -
conversion Diagnostic condition
Functional
range 630 to 6800
RPM 70 to 850 C
0.00 to 0.99 Test OFF
Test ON
Cat B2 OK
Cat B2 not OK
Specified
value 2200 RPM
above 420 C 0.00 to 0.52

1)

0.00 to 0.47

2)
Cat B2 OK
Notes



If "Cat B2 not OK" is displayed: Check Diagnostic
Trouble Code (DTC) memory Page 01
-15
. If no DTCs
are stored, replace catalytic converter.
1) Manual transmission 2) Automatic transmission
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01-106

Work step 11: Diagnostic of tank ventilation
valve

- Remove the VAG1788/10 RPM adjuster and
leave engine running at idle. Basic Settin
g
Q
Input displa
y group number XXX

When indicated on display:
- Press buttons -0-, -7- and -0- to select "display group number 070" and
press -Q- button to confirm input.
System in Basic Setting 70
1
2
3
4

When indicated on display:
Note:
If test is not initiated or if indication switches from "Test ON" to "Test
OFF", depress accelerator pedal briefly, test will be repeated. - Check specified value in display field 4.
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01-107


Display fields

1 2 3 4
Display group 070: Diagnostic of tank ventilation valve
Display xx % xx.x % g/s
---
Indicated Degree tank
ventilation valve is
opened Oxygen
sensor
control
deviation Deviation
of
Idle
control Diagnostic condition
Functional
range 0 to 99 % -25.0 to 25.0
%
Test OFF
Test ON
TVV OK
TVV not OK
Aborted
Specified
value 0 to 99 % -7.0 to 7.0
% x.xx g/s
1) TVV OK
Notes


If "TVV not OK" is displayed: Check Diagnostic Trouble
Code (DTC) memory Page 01
-15
. Check Evaporative
Emission (EVAP) canister purge regulator valve -N80-
Page 24
-128

1) An indication is only displayed if diagnostic result falls within a specified range due to deviation of idle control and not due to
deviation of an oxygen sensor (e.g. sensor 1 from EVAP canister). Otherwise, display field 3 remains empty.
If specified value "TVV OK" is obtained:
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01-108

Work step 12: Diagnostic of tank seal

Test requirements

Engine running at idle:
Intake Air Temperature (IAT) less than 95
C display group 004, display field 4.

Coolant temperature at least 80 C
Display group 4, display field 3

Fuel filler cap opened briefly (to reduce
pressure).
Basic Settin
g
Q
Input displa
y group number XXX

When indicated on display:
- Press buttons -0-, -7- and -1- to select "display group number 071" and
press -Q- button to confirm input.
System in Basic Setting 71
1
2
3
4

When indicated on display:
Notes:
Test lasts approx. 90 seconds.When the diagnostic of tank seal is performed several times in a row,
the fuel filler cap must be opened briefly before each test to release
pressure.
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01-109

- Check specified value in display field 4 after
indication "Test ON" appears:

Display fields

1 2 3 4
Display group 071: Diagnostic of tank seal
Display --- --- ---
---
Indicated Condition Reed-
Terminal DTC
message System
condition Diagnostic condition
Functional
range Reed open
Reed closed Small leak
Large leak
System not
OK
Aborted System test
Measurement
END
Measurement Test OFF
Test ON
System OK
System not OK
Aborted
Specified
value Reed open --- END
Measurement System OK
Notes


If "System not OK" is displayed: Check Diagnostic
Trouble Code (DTC) memory Page 01
-15

If specified value "Syst. OK" is obtained:

- Press -C- button.
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01-110

Work step 13: Diagnostic of Secondary Air
Injection (AIR) system

Test requirement

Engine running at idle:

Note:
During diagnostic of the Secondary Air Injection
(AIR) system, the Secondary Air Injection (AIR)
pump will run for several seconds.
Basic Setting
Q
Input displa
y group number XXX

When indicated on display:
- Press buttons -0-, -7- and -7- to select "display group number 077" and
press -Q- button to confirm input.
System in Basic Setting 77
1
2
3
4

When indicated on display:
Note:
Secondary Air Injection (AIR) system test lasts approx. 60 seconds. - Check specified value in display field 4 after indication "Test ON"
appears:
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01-111


Display fields

1 2 3 4
Display group 077: Secondary Air Injection (AIR) system diagnostic
Display xxxx/min xx.x
g/s %
---
Indicated Engine speed
(RPM) Air
mass Relative air
mass
Secondary air
system Diagnostic condition
Functional
range 670 to 6800
RPM
Test OFF
Test ON
System OK
System not OK
Specified
value 720 to 820
RPM
1)
630 to 730
RPM 2) 0 to 5 -80 to 20 System OK
Notes


If "System not OK" is displayed: Check Diagnostic
Trouble Code (DTC) memory Page 01
-15

1) Front Wheel Drive Vehicles 2) All-Wheel Drive Vehicles
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If specified value "Syst. OK" is obtained:

-
Press button.Rapid data transfer
HELP
Select function XX

Indicated on display (function selection):
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