engine AUDI A6 1998 C5 / 2.G ATQ Engine Readiness Code Owner's Manual

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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01-108

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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01-110

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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