1999 AUDI A8 AEB Engine Readiness Codes

01-74


Display fields

1 2 3 4
Display group 46: Three Way Catalytic Converter (TWC) 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 0.00-0.10 0-2 60.0 s Cat B1 OK If "Cat B1 n. OK" is indicated in display field 4:

- Check DTC memory Page 01
-15
.
If specified value "Cat B1 OK" is indicated in
display field 4:

- Press -C- button.
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01-75

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 a period of
acceleration.

- Start engine and let run at idle.Initiate 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, 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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01-76


Display fields

1 2 3 4
Display group 70: Evaporative Emissions (EVAP) canister purge regulator valve
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 Oxygen sensor control
deviation during diagnosis Diagnostic
status
Diagnostic
result
Range 0-100 % -25.0 to 25.0 % -2.70 to 4.16 g/s ---
Specified
value 0-100 % - 5.4 to 9.4 % 0.00 to 0.33 g/s EVAP OK If "EVAP n. OK" is indicated in display field 4:

- Check DTC memory Page 01
-15
.
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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01-77

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
determination Syst.Test
Measurement
Measurement 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. --- Measurement end Syst. OK
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01-78

Note:
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.
Repeating the diagnosis can take up to approx.
60 seconds until the display changes from "Test
OFF" to "Test ON"in display field 4.
Diagnosis conditions for fuel tank leak detection:

Intake Air Temperature (IAT) must be less than
90 C (194 F) Display group 4, display field
4

Engine Coolant Temperature (ECT) must be
less than 95 C (203 F) Display group 4,
display field 3

Throttle valve angle 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
-15
.
If the specified value "SYST. OK" is indicated in
display field 4:

-
Press button to advance program
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sequence.

Step 9: Check readiness code

- Check readiness code Page 01
-59
.
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