air condition AUDI A4 1998 B5 / 1.G AHA Engine Readiness Code Workshop Manual

01-72
Explanation of 8-digit readiness code Readiness code is generated only when all display values = 0 1
2
3
4
5
6
7
8
Diagnosis
0 Three Way Catalytic Converter (TWC)
0 TWC heating (not applicable / always "0")
0 EVAP system and fuel tank leak detection test
0 Secondary Air Injection (AIR) system
0 Air conditioning system (diagnosis not applicable / always "0")
0 Oxygen Sensor (O2S) control
0 Oxygen Sensor (O2S) heating
0 Exhaust Gas Recirculation (EGR) system (not applicable / always "0")
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- Check specified values in display fields 3 and
4:

Display fields

1 2 3 4
Display group 60: Adaptation of throttle valve control module to Engine Control Module (ECM)
Display
xxx
xxx
Idle
Part Throt
Full Throt
Decel
Enrich ADP.runs
ADP. OK
ADP.ERROR
Indicated Throttle valve angle Throttle drive angle Operating condition Adaptation status
Specified value --- --- Idle ADP. OK
If "ADP. ERROR" is indicated in display field 4:

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

-
Press button.
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Step 4:

- Start engine and let run at idle.

Step 5: Oxygen Sensor (O2S) control
operating condition Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block"
function 08, and press -Q- button to confirm input.
Read Measurin
g Value Block
HELP
Input display group number XXX

Indicated on display
- Press buttons -0-, -3- and -0- to input display group number 30 (030),
and press -Q- button to confirm input.
Read Measuring Value Block 30
1
2
3
4

Indicated on display (1-4 display fields)
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- Increase engine speed to 1800-2200 RPM.

- Hold at 1800-2200 RPM until specified value
"111" is shown in all of display fields 1 - 4 (
table).

Display fields

1 2 3 4
Display group 30: Oxygen Sensor (O2S) control operating condition, Bank 1 and Bank 2
Display xxx xxx xxx xxx
Indicated Status of Heated Oxygen
Sensor (HO2S), bank 1,
sensor 1, before TWC Status of Heated Oxygen
Sensor (HO2S) 2, bank 1
sensor 2, after TWC Status of Heated Oxygen
Sensor (HO2S), bank 2,
sensor 1, before TWC Status of Heated Oxygen
Sensor (HO2S) 2, bank 2
sensor 2, after TWC
Specified
value 111 111 111 111
Evaluation page 01
-80

If one of the specified values is not indicated:

- Check DTC memory page 01
-16
.
If the specified values for display fields 1-4 are
not indicated:

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