wheel AUDI A8 1995 D2 / 1.G AHA Engine On Board Diagnostic Workshop Manual

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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01-14
ECM coding variations

Country/Emissions
Drivetrain/Options
Transmission
Vehicle type
00
= ------------------ 0
= Front-wheel-drive without
traction control (ASR) 0
= 5-speed manual 0
= ------------
------
01
= ------------------ 1
= Front-wheel-drive with traction
control (ASR) 1
= ------------------ 1
= A4
02
= ------------------ 2
= All-wheel-drive without traction
control (ASR) 2
= ------------------ 2
= ------------
------
03
= ------------------ 3
= All-wheel-drive with traction
control (ASR) 3
= ------------------ 3
= ------------
------
04
= ------------------ 4
= ------------------ 4
= ------------------ 4
= ------------
------
05
= ------------------ 5
= ------------------ 5
= Automatic trans.
01V 5
= ------------
------
06
= USA, equipped with EVAP system Leak
Detection Pump (LDP) 6
= ------------------ 6
= ------------------ 6
= ------------
------
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01-15

Code number structure (example)





USA vehicle with Leak Detection Pump (LDP): 0 6
Front-wheel-drive without traction control (ASR): 0
Automatic transmission 01V: 5
Audi A4: 1
Code number: 0 6 0 5 1 Note:
Vehicles with traction control (ASR) can be recognized by the ASR control light in the instrument cluster or by ABS/ASR On
Board Diagnostic (OBD).
Repair Manual, Brake System, Repair Group 01
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01-62

Display group 000 (display in decimal values)

Engine running at idle; ECM in "Basic Setting" function 04
Display fields
Specified
value Corresponds to
1
2
3 4
5 6
7 8
9 10
Idle learn value (additive) for O2S control, bank 2 115-141 -0.65 to +0.65
ms





Idle learn value (additive) for O2S control, bank 1
115-141


-0.65 to +0.65
ms



O2S control bank 2 (if outside of tolerance, conduct test
drive) 77-179 -10 to +10 %




O2S control bank 1 (if outside of tolerance, conduct test
drive)
77-179
-10 to +10 %


Learn value-idle air flow 118-138 -5.0 to +5.0 kg/h



Idle air control value
118-138
-5.0 to +5.0 kg/h

Throttle angle 0-12
0-5


Engine speed (with electrical consumers switched off)
All-wheel drive vehicles
Front-wheel drive vehicles

62-74
74-86

620-740 RPM
740-860 RPM

Engine load (with electrical consumers switched off) 20-50 1.0-2.5 ms
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01-64

Display field 3
Possible malfunction cause
Corrective action
less than 62
(all-wheel drive)
or
less than 74
(front-wheel drive)
Drive range selected
Throttle valve control module faulty- Move selector lever to "P" or "N" position
- Check idle speed page 24
-16
- Check throttle valve control module page 24
-128

less than 74
(front-wheel drive)
Supply voltage (terminal 15) to terminal 10
of Engine Control Module (ECM) missing - Check supply voltage (terminal 15) to terminal
10 of ECM using applicable wiring diagram
greater than 74
(all-wheel drive)
or
greater less than 86
(front-wheel drive) Closed Throttle Position (CTP) switch open
Throttle valve control module faulty
Intake air leaks ("false air")- Check idle speed page 24
-16
- Check throttle valve control module page 24
-128

- Check intake air system for leaks page 24
-
126

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