engine AUDI A8 1998 D2 / 1.G AHA Engine Readiness Code User Guide

If "B1-S1 n. OK" is indicated in display field 4:
If the specified value "B1-S1 OK" is indicated in display field 4: value 2.00 ms - Check DTC memory page 01
-16
.
- Continue to hold engine speed at 1800-2200 RPM.
- Press -C- button.
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Step 7: Three Way Catalytic Converter (TWC)
diagnosis Basic Setting
HELP
Input display group number XXX

Indicated on display
- Press buttons -0-, -4- and -6- to input display group number 46 (046),
and press -Q- button to confirm input.
System in Basic Setting 46
1
2
3
4

Indicated on display (1-4 display fields)
Note:
The test time for TWC diagnosis is approx. 60 seconds. - Hold engine speed at 1800-2200 RPM until display changes from "Test
OFF" to "Test ON" in display field 4.
- Continue to hold at 1800-2200 RPM until specified value "Cat B1 OK"
is indicated in display field 4.
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Display fields

1 2 3 4
Display group 46: Three Way Catalytic Converter (TWC), Bank 1 diagnosis
Display x.xx x xx.x s Test OFF/Test ON
Cat B1 OK/
Cat B1 n. OK
Indicated Amplitude ratio Exceeded diagnosis range Test time of TWC diagnosis Diagnostic status
Diagnostic result
Range 0.00-1.00 0-9 00.0-60.0 ---
Specified value 0.00-0.26 0-2 60.0 s Cat B1 OK If "Cat B1 n. OK" is indicated in display field 4:

- Check DTC memory page 01
-16
.
If specified value "Cat B1 OK" is indicated in
display field 4:

- Continue to hold engine speed at 1800-2200
RPM.

- Press button -3- once to advance to display
group number 47.
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- Hold engine speed at 1800-2200 RPM until
display changes from "Test OFF" to "Test ON" in
display field 4.

- Continue to hold at 1800-2200 RPM until
specified value "Cat B2 OK" is indicated in
display field 4.

Note:
The test time for TWC diagnosis is approx. 60
seconds.

Display fields

1 2 3 4
Display group 47: Three Way Catalytic Converter (TWC), Bank 2 diagnosis
Display x.xx x xx.x s Test OFF/Test ON
Cat B2 OK/
Cat B2 n. OK
Indicated Amplitude ratio Exceeded diagnosis range Test time of TWC diagnosis Diagnostic status
Diagnostic result
Range 0.00-1.00 0-9 00.0-60.0 ---
Specified value 0.00-0.26 0-2 60.0 s Cat B2 OK
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Step 8: Evaporative Emissions (EVAP)
system and fuel tank leak detection

Note:
During this diagnosis there should be no engine
load, otherwise the diagnosis is interrupted and
can only be restarted after pressing the
accelerator pedal momentarily.

- Start engine and let run at idle.Basic Settin
g
HELP
Input displa
y group number XXX

Indicated on display
- Press buttons -0-, -7- and -0- to input display group number 70 (070),
and press -Q- button to confirm input.
System in Basic Setting 70
1
2
3
4

Indicated on display (1-4 display fields)
If the diagnosis is initiated by the ECM, the display changes from "Test
OFF" to "Test ON" in display field 4.
Note:
If the display changes from "Test ON" to "Test OFF" during the diagnosis,
briefly accelerate the engine to reset and repeat the test. - Let engine continue to run at idle until the specified value "EVAP OK" is
indicated in display field 4.
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Initiate basic setting 71
1
2
3
4

Indicated on display (1-4 display fields)
If the diagnosis is initiated by the ECM, the display changes from "Test
OFF" to "Test ON" in display field 4. - Start engine and let run at idle.
- Let engine continue to run at idle until the specified value "Syst. OK" is
indicated in display field 4.

Display fields

1 2 3 4
Display group 71: Fuel tank leak detection
Display Reed op.
Reed cl. Small leak/large leak
disconnection Syst.Test
Check
Check end Test OFF/Test ON
Syst. OK/
Syst. n.OK
Indicated Status: Reed contact Error message System status Diagnostic status
Diagnostic result
Range --- --- --- ---
Specified value Reed op. --- Check end Syst. OK
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Notes:
If display field 4 changes from "Test ON" to "Test
OFF" and "Abort" appears in display field 2,
repeat the diagnosis of fuel tank leak detection.
Shut the engine off, start the engine again and
repeat the leak detection test.
Diagnosis conditions for fuel tank leak detection:

Intake Air Temperature (IAT) must be less than
60 C (140 F) display group 4, display field 4
(the temperature can be reduced by opening
the hood).

The throttle valve angle for vehicles with
automatic transmissions must be smaller than
10 display group 3, display field 3

The throttle valve angle for vehicles with
manual transmissions must be smaller than
10 display group 3, display field 3
If "Syst. n. OK" is indicated in display field 4:

- Check DTC memory page 01
-16
.
If the specified value "Syst. OK" is indicated in
display field 4:
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Step 9: Secondary Air Injection (AIR) system
diagnosis

- Start engine and let run at idle.Initiate basic setting
HELP
Input displa
y group number XXX

Indicated on display
- Press buttons -0-, -7- and -7- to input display group number 77 (077),
and press -Q- button to confirm input.
System in Basic Setting 77
1
2
3
4

Indicated on display (1-4 display fields)
If the diagnosis is initiated by the ECM, the display changes from "Test
OFF" to "Test ON" in display field 4. - Let engine continue to run at idle until the specified value "Syst. OK" is
indicated in display field 4.
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