display AUDI A4 1995 B5 / 1.G APB Engine Motronic Syst

01-1


Motronic system, On Board
Diagnostic (OBD)

On Board Diagnostic, technical data


Equipment
The advantages of OBD can only be fully
exploited by using the vehicle diagnostic, testing
and information system VAS5051 or the
VAG1551 scan tool, in operating mode 1 "Rapid
data transfer."
The DTC memory is equipped with a permanent
memory and therefore does not depend on the
power supply.
The stored malfunctions will be displayed after
checking the DTC memory Page 01
-15
.
After eliminating malfunctions the DTC memory
must be erased Page 01
-15
.

Important note:

Every time the DTC memory is erased and the
voltage supply to the Motronic Engine Control
Module (ECM) -J220 has been interrupted the
readiness code must be generated Page 01
-
105
.
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01-7

Mode under Address word 33:
Mode 1: Transmit diagnostic data Switch ignition on or let engine run at idle
Mode 2: Transmit operating conditions Switch ignition on or let engine run at idle
Mode 3: Check DTC Memory Switch ignition on or let engine run at idle
Mode 4: Erase diagnostic data Switch ignition on or let engine run at idle
Mode 5: Output of oxygen sensor signals Switch ignition on or let engine run at idle
Mode 6: Transmit measured values Switch ignition on or let engine run at idle
Mode 7: Check DTC Memory Switch ignition on or let engine run at idle
Mode 8: Check tank leak test Switch ignition on or let engine run at idle
Mode 9: Read out vehicle information Let engine run at idle Mode 1 to 9 can be selected under address word 33.

Individual measured values can be read out under mode 1. Mode 1 is not recommended for authorized Audi service
centers, since the data can be obtained much more accurately under address word 01 function 04 or function 08.
Mode 2 displays operating conditions, for which malfunctions are recognized.
With mode 3 the DTC memory will be checked and with mode 4 the DTC memory will be erased.
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01-8

Mode 5 displays the static dimensions of the oxygen sensors, which are legally required. Since these dimensions are not
directly relevant to oxygen sensor diagnostics, mode 5 is insignificant for the authorized Audi center.
With mode 6 all measured values can be checked from components and systems that are not constantly monitored.
Using mode 7, DTCs can be checked for which the Malfunction Indicator Light (MIL) is not yet lit (MIL is not on, no DTCs
under mode 3).
Under mode 8 the tank leak test will be checked.
With mode 9 the following vehicle information can be read out: Vehicle Identification Number (VIN), Part number and
program/data level of the engine control module and the check sum (this value is a internal calculated value).
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01-10

WARNING!

When performing a road test and checks, the
vehicle diagnostic, testing and information
system VAS5051 as well as the VAG1551
may be secured only on rear seat, from
where it is to be operated by a second
technician.
Please follow safety precautions Page 24
-1

Note:
Only the procedure for OBD VAG1551 is
described below. For details of how to use the
vehicle diagnostic, testing and information
system VAS5051, please refer to its operating
manual. VAG - On Board Dia
gnostic
HELP
1 - Rapid data transfer*2 - Blink code output*

Indicated on display
* Appears alternately
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01-11

- If no display appears, check diagnostic
cables:

Electrical Wiring Diagrams, Troubleshooting &
Component Locations Depending on the function required:

- Switch ignition on.

or

Start engine Page 01
-6 , table of available
functions.

- Switch on printer with PRINT button (indicator
light in button lights up).

- Press button -1- to select "Rapid data transfer"
operating mode. Rapid data transfer
HELP
Insert address word XX

Indicated on display:
Rapid data transfer
Q
01 - En
gine Electronics

- Press buttons -0- and -1- to insert "Engine electronics" address word
01.
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01-12

Rapid data transfer
HELP
Control module does not answer

If the display shows one of the messages reproduced here, run through
the troubleshooting procedure as described in the Electrical Wiring
Diagrams, Troubleshooting and Component Location binder.
Electrical Wiring Diagrams, Troubleshooting and Component Locations
Rapid data transfer
HELP
K wire not switching to Ground

Rapid data transfer
HELP
K wire not switching to B+

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01-13

Control module identification (example) 4D0907551.. 2.7L V6/5VT
G 0002..
Codin
g 06711
WSC 06388

The display on VAG1551 will show the control module identification, for
example: 1)
The engine is a so called Biturbo engine, that means the engine is
equipped with two turbo chargers. "Bi" (latin) stand for two. 4D0907551... Engine Control Module (ECM) Part No.
2.7 L Engine displacement
V6 / 5VT Engine configuration
(V6 5-valve Turbo
1)

G or no
display "G" for vehicles with Cruise control system or not 0002ECM Software version Coding
06711 Coding of ECM WSC 06388Dealership code of VAG1551 with which the last
coding was performed
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01-14
If the coding differs from the vehicle version,
then:

- Check coding of engine control module Page
01
-93
, Coding engine control module.

-
Press button.Rapid data transfer
HELP
Select function XX

Indicated on display:
Note:
After pressing the HELP button, an overview of the possible functions is
printed out.
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01-15

Diagnostic Trouble Code (DTC) Memory,
checking and erasing


- Connect vehicle diagnostic, testing and
information system VAS5051 or VAG1551 scan
tool and select "Engine Electronics" by entering
address word 01 Page 01
-9. When doing this
the engine must be idling.
Only if engine does not start:

- Check engine with ignition switched on.

- Switch on printer with PRINT button (indicator
light in button lights up). Rapid data transfer
HELP
Select function XX

Indicated on display
- Operate scan tool according to information on display:
- Press buttons -0- and -2- to select function "Check DTC Memory" and
confirm entry with -Q- button.
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01-16

No DTC reco
gnized

Indicated on display
or -
Press button.
X DTC reco
gnized

Indicated on display
The stored malfunctions will be displayed and printed out in sequence.
Note: - Locate and eliminate printed out malfunctions according to DTC table
Page 01
-19
.
If no malfunction is stored in the DTC memory, do not erase memory,
otherwise readiness code must be generated. If the DTC memory was erased, generate readiness code Page 01
-
105
.
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)
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yp
e=re
pair&id=AUDI.B5.FU04.01.1