display AUDI A6 1995 C5 / 2.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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Read Measurin
g Value Block
HELP
Input display group number XXX

Indicated on display
- Press buttons -0-, -8- and -6- to input display group number 86 (086),
and press -Q- button to confirm input.
Read Measuring Value Block 86
1
2
3
4

Indicated on display (1-4 display fields)
Note:
The readiness code is generated as soon as only zeros are shown in
display field 1. - Check readiness code values in display field 1.
Specified value: 00000000
-
Press button.
Rapid data transfer
HELP
Select function XX

Indicated on display
If the readiness code was not generated, generate readiness code again
page 01
-73
. - Press buttons -0- and -6- to select "End Output" function 06, and press
-Q- button to confirm input.
- Check readiness code page 01
-70
. If DTC memory has been
erased, or ECM has been disconnected from B+, generate readiness
code again page 01
-73
.
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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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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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Step 2: Erase DTC memory Rapid data transfer
HELP
Select function XX

Indicated on display
Note:
When erasing DTC memory, the readiness code is also erased. - Press buttons -0- and -5- to select "Erase DTC Memory" function 05,
and press -Q- button to confirm input.
Rapid data transfer DTC Memor
y is erased

Indicated on display
-
Press button.
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Step 3: Adaptation of throttle valve control
module to ECM 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 Measuring Value Block
HELP
Input displa
y group number XXX

Indicated on display
- Press buttons -0-, -6- and -0- to input display group number 60 (060),
and press -Q- button to confirm input.
Read Measuring Value Block 60
1
2
3
4

Indicated on display (1-4 display fields) - Press -4- button to select "Basic Setting" function 04 (adaptation of
throttle valve control module to ECM)
System in Basic Setting 60
1
2
3
4

Indicated on display (1-4 display fields)
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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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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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