AUDI TT 1998 8N / 1.G ATW Engine Readiness Code Workshop Manual

01-67


Readiness code
The readiness code appears as an 8-digit display
in measuring value block 086, display field 1.
Each of the 8 digits is allocated to a specific
exhaust related system.
During a test sequence which must be performed
completely, On Board Diagnostic (OBD) checks
the function of each of these systems and then
changes the character assigned to it in the 8-digit
indication from "1" to "0" once test has been
performed successfully.
When the readiness code is generated after a
successfully completed test sequence, it reads "0
0 0 0 0 0 0 0" (measuring value block 086,
display field 1).
If a single test is completed entirely, but indicated
as "not OK", a DTC will be stored in DTC
memory. Check DTC Memory Page 01
-16
.
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01-68

Readiness code is returned to"0 1 1 0 1 1 0 1"
if:

DTC memory was erased,
Voltage supply to ECM was cut off (e.g.
connector disconnected, battery disconnected)
a new Engine Control Module (ECM) was
installed
In this case, the readiness code must be re-
generated Page 01
-73
.

Note:
During driving operation in various load
conditions, exhaust relevant tests are performed
by the control module and the readiness code is
generated on its own. In this case, however, the
concluding control possibilities are not available,
meaning that it will not be indicated whether the
vehicle is free of malfunctions upon transfer to
the customer.
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01-69

Read readiness code


Test sequence

- Connect VAS5051 tester or VAG1551 scan tool
and select control module for engine electronics
using "address word" 01 Page 01
-10
. Ignition
must remain switched on.
Rapid data transfer
HELP
Select function XX

When indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block" and
press -Q- button to confirm input.
Read measuring value block
Q
Enter displa
y group number XXX

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

When indicated on display
- Check readiness code in display field 1

Specification: 0 0 0 0 0 0 0 0
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Display fields

1 2 3 4
Display group 086: Readiness code
Display
0 0 0 0 0 0 0 0 X X X X X X X X X X X X X X X X

Indicated
Ready-Bits
completed tests individual tests carried out individual tests carried out
Functional range
1 = not completed
0 = completed 1 = not completed
0 = completed 1 = not completed
0 = completed
Specified value
0 0 0 0 0 0 0 0 X X X X X X X X X X X X X X X X
Note
Significance of readiness code Page 01
-71


Note for display field 1:
Display field 1 is the most important. This indicates which system was checked via On Board Diagnostic (OBD) since the last
time DTC memory was erased or a new control module was implemented. Once DTC memory is erased, all testable values
are set to "1", after the test is performed successfully, the values are set to "0".
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X
X
X
X
X
X
X
X
Notes for display group 086, display field 1



Diagnostic of catalytic converter

Indication 0 = test was performed
Indication 1 = test was not performed (generate readiness code Page 01
-73
)





Indication always 0




EVAP system

Indication 0 = test was performed
Indication 1 = test was not performed (generate readiness code Page 01
-73
)






Secondary air system

Indication 0 = test was performed
Indication 1 = test was not performed (generate readiness code Page 01
-73
)



Indication always 0







Oxygen sensors

Indication 0 = test was performed
Indication 1 = test was not performed (generate readiness code Page 01
-73
)


Oxygen sensor heating

Indication 0 = test was performed
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Indication 1 = test was not performed (generate readiness code Page 01
-73
)








Indication always 0
Note:
Readiness code is not generated until all indications in display field 1 display "0"
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Once the specified value "0 0 0 0 0 0 0 0" is
reached in display field 1:

-
Press button.Rapid data transfer
HELP
Select function XX

Indicated on display (function selection)
If specified value is not obtained: - Check DTC memory as a control measure Page 01
-16
(there must
not be any DTCs stored)
- Generate readiness code Page 01
-73
.
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Readiness code, generating


Special Tools and Equipment

Requirements
Note:
If, during a work step, the test result is indicated as "OK" immediately after
selecting a display group, the test has already been carried out and it is
OK to continue on to the next work step.
VAG1788/10 RPM adjusterVehicle stationary Vehicles with automatic transmission Selector lever in P or N. Electrical consumers switched off (radiator fan must NOT run during
test). A/C switched off. Coolant temperature at least 80 C Display group 004, display field
3. Important: Drive engine warm via road test if possible.
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Work step 1: Check DTC Memory

Test requirement:

Engine not running, ignition switched on.

- Connect VAS5051 tester or VAG1551 scan tool
and select control module for engine electronics
using "address word" 01 Page 01
-10
.
Rapid data transfer
HELP
Select function XX

When indicated on display
- Press buttons -0- and -2- to select "Check DTC memory" and press -Q-
button to confirm input.
X malfunctions reco
gnized!

Number of stored DTCs or "No DTC recognized" will be indicated on
display.
If a DTC is stored:
If no DTCs are stored: - Repair malfunction, erase DTC memory. Road test vehicle and then
check DTC memory as a control measure.
-
Press button.
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Work step 2: Erase DTC Memory

Test requirement:

Engine not running, ignition switched on.
Rapid data transfer
HELP
Select function XX

When indicated on display
Note:
When DTC memory is erased, readiness code is reset and must therefore
be re-generated. - Press buttons -0- and -5- to select "Erase DTC memory" and press -Q-
button to confirm input.
Rapid data transfer DTC Memor
y is erased!

When indicated on display
-
Press button.
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