1998 AUDI A8 display

01-1


On Board Diagnostic (OBD)

Function

The Multiport Fuel Injection (MFI) system is
equipped with an Engine Control Module (ECM) -
J220- with On Board Diagnostic (OBD)
capability.
When malfunctions occur in sensors or
components monitored by OBD, Diagnostic
Trouble Codes (DTC) are stored in DTC
memory.
Stored DTCs are identified using the VAG 1551
Scan Tool (ST) Page 01
-15
.
After the necessary repairs are completed, DTC
memory must be erased Page 01
-40
.
OBD II legal regulations require a display
(readiness code) that shows inspection
readiness for the annual exhaust emissions test.
The readiness code shows that every component
and/or system that affects exhaust emissions,
which can lead to the Malfunction Indicator Lamp
(MIL) being switched on, has been operated at
least once with positive results.
The readiness code is reset and/or erased and
must be regenerated every time DTC memory is
erased, the power supply to the ECM -J220- is
interrupted (example: when connecting test box
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01-6

Function 03: Output Diagnostic Test Mode Ignition switched on
Function 04: Basic Setting Engine running at idle
Function 07: Code Control Module Ignition switched on
Function 08: Read Measuring Value Block Ignition switched on -or- Engine running at idle -or- Driving Modes under address word 33: Mode 1: Transfer diagnostic data Ignition switched on -or- Engine running at idle
Mode 2: Transfer operating conditions Ignition switched on -or- Engine running at idle
Mode 3: Check DTC memory Ignition switched on -or- Engine running at idle
Mode 4: Erase diagnosis information Ignition switched on -or- Engine running at idle
Mode 5: Output of HO2S signals Ignition switched on -or- Engine running at idle
Mode 6: Transfer measuring values Ignition switched on -or- Engine running at idle
Mode 7: Check DTC memory Ignition switched on -or- Engine running at idle Under Address word 33, Mode 1 to Mode 7 can be addressed.
Under Mode 1 individual measuring values can be displayed. Mode 1 is not recommended for use in an Audi Service
department, because these values can be displayed much more precisely using address word 01 and "Basic Setting"
function 04 or "Read Measuring Value Block" function 08.
Mode 2 shows the operating conditions under which the stored malfunctions were recognized.
With Mode 3, DTC memory is checked-with Mode 4, DTC memory is erased.
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01-8

Connecting

Notes:
Scan tool operating instructions - Locate Data Link Connector (DLC), under driver's knee bar to left side
of steering wheel.
- Connect VAG 1551 Scan Tool (ST) with VAG 1551/3 adapter cable to
DLC.
- Switch ignition on, or start engine, depending on function to be
selected.
If scan tool displays do not appear as indicated:If "Error in communication link" is displayed, disconnect adapter cable
at scan tool, reconnect, and repeat procedure.
- Operate scan tool and advance through program sequence by
following display:
- Press button -1- to select "Rapid data transfer" operating mode 01.
- Press buttons -0- and -1- to insert "Engine Electronics" address word
01, and press -Q- button to confirm input.
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01-9

8D0907557 1,8L R4/5VT MOTR HS D02 Coding 06051
WSC 00000

Indicated on display (ECM identification and coding)
8D0 _ _ _
_ _ _ _ Engine Control Module (ECM) Part No.
1.8 L Engine displacement
R4 / 5VT Engine type:
In-line (Reihenmotor), 4-Cyl.
5- Valve, Turbocharged
MOTR Motronic
HS
AT Manual transmission
Automatic transmission
D.. ECM software version
Coding ECM coding:
See coding table page WSC
12345 Plant number: indicates where the VAG 1551 scan tool was
used for the last coding and/or adaptation (as long as factory
coding has not been changed, WSC 00000 is displayed)
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01-10

Notes:
If the ECM version that corresponds to the
vehicle is not displayed, replace ECM Page
01
-57
. Incorrect ECM coding leads to:

Performance problems (e.g. jerky shifting,
abrupt load changes, etc.
Increased fuel consumption
Elevated exhaust gas values
Reduction in transmission service life
Malfunctions not present are stored in DTC
memory
Necessary functions are not carried out (oxygen
sensor control, actuation of EVAP canister
system, etc.)

-
Press button to advance program
sequence.
Rapid data transfer
HELP
Select function XX

Indicated on display
- Continue as specified in procedures for specific OBD functions.
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01-11

Code Control Module (function 07)

If vehicle coding information is not as specified,
or if the ECM has been replaced, the ECM must
be coded as follows.

Required special tools and test equipment

VAG 1551/ VAG 1552 Scan Tool (ST) with VAG
1551/3 adapter cable

Coding procedure

- Connect VAG 1551/ VAG 1552 Scan Tool (ST)
and press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (ignition switched
on) Page 01
-7 .
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -7- to select "Code Control Module function 07,
and press -Q- button to confirm input.
Code Control Module
HELP
Input code number XXXXX
(0-32000
)

Indicated on display
______________________________________________ - Input applicable code number for vehicle, and press -Q- button to
confirm input. ECM coding variations Page 01
-13
.
Function is unknown or

If indicated on display:
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01-12

8D0907557 1,8L R4/5VT MOTR HS D02 Coding 06051
WSC 00000

Indicated on display (ECM identification and coding, e.g. 06051)
-
Press button to advance program sequence.
Rapid data transfer
HELP
Select function XX

Indicated on display
Note:
The Motronic ECM -J220- only uses the code that has been entered after
the ignition has been switched off once. Incorrect coding leads to: - Press buttons -0- and -6- to select "End Output" function 06, and press
-Q- button to confirm input.
Performance problems (e.g. jerky shifting, abrupt load changes, etc.Increased fuel consumptionElevated exhaust gas valuesFalse malfunctions stored in DTC memoryReduction in transmission service life
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01-15

Check Diagnostic Trouble Code (DTC)
Memory (function 02)


Required special tools and test equipment

VAG 1551/ VAG 1552 Scan Tool (ST) with VAG
1551/3 adapter cable

Checking

- Connect VAG 1551/ VAG 1552 Scan Tool (ST)
and press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (engine running at
idle) Page 01
-7 .

Note:
If engine does not start:
- Operate starter to crank engine for approx. 6
seconds, then do not switch ignition off.

- Press PRINT-button to switch scan tool printer
on (indicator light in button lights up). 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.
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