1998 AUDI A8 display

01-17

X DTC reco
gnized

Indicated on display (number of stored malfunctions, or "No DTC
recognized")
Note:
If scan tool displays do not appear as indicated:
Scan tool operating instructions
If one or more malfunctions are stored:
Stored malfunctions are displayed one after another, and are printed out
along with applicable DTCs.
Rapid data transfer
HELP
Select function XX

Indicated on display (after all stored malfunctions)
If no DTCs are recognized:
-
Press button to advance through program sequence.- Press buttons -0- and -6- to select "End Output" function 06, and press
-Q- button to confirm input.
- Repair malfunctions according to Diagnostic Trouble Code (DTC) table
page 01
-18
.
- Erase DTC memory page 01
-49
.
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01-18
Diagnostic Trouble Code (DTC) table

Notes:

The DTC table is organized according to SAE and VAG diagnostic trouble codes.
The column labeled "MIL" specifies the MIL switching condition associated with that DTC.
DTCs that do not switch on the MIL after the malfunction is recognized by the ECM are identified by the MIL switching
condition "Off."
DTCs that do switch on the MIL immediately after the malfunction is recognized by the ECM are identified by the MIL
switching condition "Immed."
DTCs that are recognized by the ECM and switch on the MIL after two consecutive driving cycles (Dcy) are identified by
the MIL switching condition "2 Dcy."
Always correct malfunctions that are designated "immediately" as soon as possible, followed by those malfunctions that
are designated "2 Dcy."
When all repairs have been completed, erase DTC memory ( page 01
-49
) and then generate new readiness code
page 01
-73
.
DTCs that are recognized as a result of intermittent malfunctions, or DTCs that are not erased after repairs, are classified
as sporadic malfunctions. These are identified by the designation "SP" appearing in the display.
A sporadic malfunction will be erased if it no longer occurs after 50 driving cycles during which the engine reaching
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01-49

Erase DTC Memory (scan tool function
05)


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

Test condition
Malfunction(s) repaired

Note:
If DTC memory has been erased, generate new
readiness code page 01
-73
.

Erasing

- Connect VAG1551/VAG1552 Scan Tool (ST)
and press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (engine running at
idle) page 01
-8 .
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.
-
Press button to advance through program sequence until all stored
malfunctions have been displayed.
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Rapid data transfer
HELP
Select function XX

Indicated on display
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01-50

- Press buttons -0- and -5- to select "Erase DTC
Memory" function 05, and press -Q- button to
confirm input. Rapid data transfer DTC Memory is erased

Indicated on display
-
Press button to advance through program sequence.
Rapid data transfer
HELP
Select function XX

Indicated on display
Safety precautions for road testing vehicle page 24
-9 - Press buttons -0- and -6- to select "End Output" function 06, and press
-Q- button to confirm input.
- Road test.
- Initiate "Automatic Test Sequence" by pressing -0- button twice to
insert address word 00.
- Check readiness code page 01
-70
. If DTC memory has been
erased, or ECM has been disconnected, generate readiness code
page 01
-73
.
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01-53

Test sequence

- Connect VAG1551/VAG1552 scan tool and
insert "Engine Electronics" address word 01
(ignition on) page 01
-8 .
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -3- to select "Output Diagnostic Test Mode"
function 03.
Rapid data transfer
Q
03 - Output Dia
gnostic Test Mode

Indicated on display
Fuel injectors:
- Press -Q- button to confirm input.
Output Diagnostic Test Mode Cylinder 1 Fuel In
jector-N30

Indicated on display
Note:
The fuel pump relay must be activated, the fuel pump must run, and you
must clearly hear the flow of fuel in the fuel pressure regulator. If the fuel
pump does not run, check fuel pump relay and connections page 24
-
95
.
- Operate throttle valve at throttle body.
As soon as the Closed Throttle Position (CTP) switch opens, cylinder 1
fuel injector must be actuated (click) 5 times.
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01-55

EVAP canister purge regulator valve -N80-:

-
Press button.Output Diagnostic Test Mode EVAP Canister Pur
ge Re
gulator Valve-N80

Indicated on display
The valve will click until pressing the button to advance the program
sequence.
If the valve is not actuated (does not click):
Secondary Air Injection (AIR) solenoid valve -N112-: - Check EVAP canister purge regulator valve page 24
-116
.
-
Press button.
Output Diagnostic Test Mode Secondar
y Air In
jection Valve-N112

Indicated on display
The valve will click until pressing the button to advance the program
sequence.
If the valve is not actuated (does not click): - Check secondary air injection solenoid valve -N112- Repair Manual,
2.8 Liter V6 5V Engine Mechanical, Repair Group 26.
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01-56

Secondary Air Injection (AIR) pump relay -
J299-:

-
Press button.Output Diagnostic Test Mode Secondary Air Injection Relay-J299

Indicated on display
The relay will be actuated and turn on the secondary AIR pump motor
until pressing the button to advance the program sequence.
If the relay is not actuated (does not click) or the motor does not run:
Intake manifold tuning valve -N156- (change-over valve): - Check secondary air injection pump relay -J299- Repair Manual, 2.8
Liter V6 5V Engine Mechanical, Repair Group 26. -
Press button.
Output Diagnostic Test Mode Intake Manifold Changeover Valve-N156

Indicated on display
The valve will click until pressing the button to advance the program
sequence.
If the valve is not actuated (does not click): - Check intake manifold tuning valve -N156- page 24
-116
.
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