AUDI A8 1998 D2 / 1.G ATQ Engine Readiness Code Service Manual

-
Press button.
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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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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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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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Work step 14: Readiness code, reading

- Read readiness code Page 01
-78
.
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