1998 AUDI A4 AHA Engine Readiness Code Workshop Manual

01-83

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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01-84


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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System in Basic Setting 47
1
2
3
4

Indicated on display (1-4 display fields)
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01-85

- 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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If "Cat B2 n. OK" is indicated in display field 4:

- Check DTC memory page 01
-16
.
If specified value "Cat B2 OK" is indicated in
display field 4:

- Press -C- button.
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01-86

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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01-87


Display fields

1 2 3 4
Display group 70: Evaporative Emissions (EVAP) canister purge regulator valve diagnosis
Display xxx % xx.x % xx.xx g/s Test
OFF/Test ON
EVAP OK/
EVAP n. OK
Indicated Opening of EVAP canister purge
regulator valve during diagnosis Oxygen sensor control
deviation during diagnosis Idle Air Control (IAC) valve
deviation during diagnosis Diagnostic
status
Diagnostic
result
Range 0 - 100 % -25.0 to +25.0 % -2.78 to +2.85 g/s ---
Specified
value 0 - 93 % -15.0 to +15.0 % -1.00 to 0.00 g/s EVAP OK If "EVAP n. OK" is indicated in display field 4:

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

- Press -3- button to input display group number
71.
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01-88

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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