check engine AUDI A4 1998 B5 / 1.G AHA Engine Readiness Code Workshop Manual

01-70


Readiness code

Readiness code, checking


Note:
The readiness code will be erased:

When Diagnostic Trouble Code (DTC) memory
is erased
When the Engine Control Module (ECM)
harness connector is disconnected (e.g. to
connect VAG1598/22 test box)
When the battery is disconnected

Required special tools and test equipment
VAG1551 Scan Tool (ST) with VAG1551/3
adapter cable

Checking

- Connect VAG1551/VAG1552 Scan Tool (ST)
and press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (with ignition
switched on) page 01
-8 .
Rapid data transfer
HELP

Indicated on display
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Step 1: Check DTC memory Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -2- to select "Check DTC Memory" function 02,
and press -Q- button to confirm input.
No DTC reco
gnized

Indicated on display
If one or more DTCs are stored:
Safety precautions for road testing vehicle page 24
-9
If no DTCs were recognized: - Repair cause of malfunction.
- Erase DTC memory.
- Stop engine, start engine again, and road test.
- Check DTC memory again and erase.
-
Press button.
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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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- 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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- Continue to hold at 1800-2200 RPM until
specified value "B1-S1. OK" is indicated in
display field 4.

Display fields

1 2 3 4
Display group 34: Oxygen sensor aging, Bank 1 (time period of oxygen sensor)
Display xxxx RPM xx.xx ms xx.xx s Test OFF/Test
ON
B1-S1 OK/
B1-S1 n. OK
Indicated Engine speed
(increments of 40
RPM) Engine load Time period of HO2S before TWC, bank 1,
sensor 1 Diagnostic status

Diagnostic result
Range 0-6800 RPM 0.00-12.75
ms 0.00-5.00 s ---
Specified
value 1800-2200 RPM 0.80-2.00 ms 0.20-2.10 s B1-S1 OK If "B1-S1 n. OK" is indicated in display field 4:

- Check DTC memory page 01
-16
.
If the specified value "B1-S1 OK" is indicated in
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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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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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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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