engine AUDI A8 1998 D2 / 1.G AHA Engine Readiness Code Workshop Manual
[x] Cancel search | Manufacturer: AUDI, Model Year: 1998, Model line: A8, Model: AUDI A8 1998 D2 / 1.GPages: 29, PDF Size: 0.08 MB
Page 1 of 29

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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01-73
Readiness code, generating
Required special tools and test equipment
VAG1551 Scan Tool (ST) with VAG1551/3
adapter cable
Test requirements
No malfunctions stored in DTC memory
Engine not stopped (ignition not switched off)
during the test
Vehicle not moving
All electrical consumers switched off (coolant
fan must not run during test)
Test sequence
- 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 .
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01-74
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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Page 9 of 29

01-77
- 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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01-78
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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Page 11 of 29

01-79
- 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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01-80
Explanation of 3-digit value in display fields 1
and 2:
When display = 1
1
2
3
1 Oxygen Sensor (O2S) control active
1 Heated Oxygen Sensor (HO2S)
operational
1 Oxygen Sensor (O2S) heater ON
Step 6: Oxygen sensor aging (time period)
- Press button -4- to select "Basic Setting"
function 04.
- Press button -3- four times to advance to display
group number 34. System in Basic Setting 34
1
2
3
4
Indicated on display (1-4 display fields) - Hold engine speed at 1800-2200 RPM until display changes from "Test
OFF" to "Test ON" in display field 4.
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01-81
- 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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Page 14 of 29

display field 4:
- Continue to hold engine speed at 1800-2200
RPM.
- Press button -3- once to advance to display
group number 35.
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01-82
System in Basic Setting 35
1
2
3
4
Indicated on display (1-4 display fields) - 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 "B2-S1 OK" is
indicated in display field 4.
Display fields
1 2 3 4
Display group 35: Oxygen sensor aging, Bank 2 (time period of
oxygen sensor)
Display xxxx RPM xx.xx
ms xx.xx s Test
OFF/Test
ON
B2-S1 OK/
B2-S1 n.
OK
Indicated Engine speed
(increments of 40
RPM) Engine
load Time period of
HO2S before
TWC, bank 2,
sensor 1 Diagnostic
status
Diagnostic
result
Range 0-6800 RPM 0.00-
12.75
ms 0.00-5.00 s ---
Specified 1800-2200 RPM 0.80- 0.20-2.10 s B2-S1 OK
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