display AUDI A6 2000 C5 / 2.G AHA Engine On Board Diagnostic Workshop Manual

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 VAG1551
Scan Tool (ST) page 01
-16
.
After the necessary repairs are completed, DTC
memory must be erased page 01
-49
.
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
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01-7
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, Modes 1-7 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.
Mode 5 shows the statistical value of the oxygen sensors as mandated by law. As these values have no direct bearing on
oxygen sensor diagnosis, Mode 5 is of no particular value in an Audi Service department.
Under Mode 6, values can be checked for components and systems that are not continuously monitored.
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01-9

Connecting

Notes:
Scan tool operating instructions - Locate Data Link Connector (DLC), under driver's knee bar to left of
steering wheel.
- Connect VAG1551 Scan Tool (ST) with VAG1551/3 adapter cable to
DLC.
- Switch ignition on, or start engine, depending on function to be
selected ( page 01
-5 ).
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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01-10

4D0907551A 2.8L V6/5V MOTR HS D01 Coding 06051
WSC 00000

Indicated on display (ECM identification and coding, example)
4D0 _ _
_ Engine Control Module (ECM) Part No.
2.8 L Engine displacement
V6/5V Engine type:
V-engine, 6-cylinder, 5-valve
MOTR Motronic
HS
AT Manual transmission
Automatic transmission
D.. ECM software version
Coding ECM coding
Coding variations page 01
-14

WSC
12345 Plant number: indicates where VAG1551 scan tool was used
for last coding and/or adaptation (as long as factory coding
has not been changed, WSC 00000 is displayed)
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01-11

Notes:
If the ECM version that corresponds to the
vehicle is not displayed, replace ECM page
01
-68
. 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
Storage of non-existent malfunctions in DTC
memory
Necessary functions not being carried out
(oxygen sensor control, actuation of EVAP
canister system, etc.)

-
Press button to advance through 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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01-12

Code Control Module (scan tool 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
VAG1551 Scan Tool (ST) with VAG1551/3
adapter cable

Coding procedure

- Connect VAG1551/VAG1552 Scan Tool (ST)
and press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (ignition switched
on) page 01
-8 .
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
-14
.
Function is unknown or

If indicated on display:
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01-13

4D0907551A 2.8L V6/5V MOTR HS D01 Coding 06051
WSC 00000

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

Indicated on display
Notes:
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 valuesStorage of non-existent malfunctions in DTC memoryReduction in transmission service life
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01-16

Check DTC Memory (scan tool function
02)


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 (engine running at
idle) page 01
-8 .

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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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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