1995 AUDI A8 ATQ Engine Motronic Injection System Servicing Workshop Manual

24-23


Installing
Installation is reverse of removal, noting the following:
Important note:
After installing new Engine Control Module (ECM), the following work
steps must be performed:
- Check DTC memory and erase it if necessary Page 01
-15
.
- Perform adaptation of the Throttle Valve Control Module -J338- Page
24
-142
. - Using a screwdriver, carefully pry off retaining bracket (arrow).
- Disengage locking lugs and remove control module connector.
- Remove Engine Control Module (ECM).
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24-24
- Observe notes for coding new Engine Control
Module (ECM) Page 01
-71
.
- For vehicles with cruise control (discernable at
steering column), switch this free in ECM:

Repair Manual, Electrical Equipment, Repair
Group 01; On Board Diagnostic (OBD) of cruise control system; Cruise control system, checking

- Adapt immobilizer to Engine Control Module
(ECM):

Repair Manual, Electrical Equipment, Repair
Group 01; On Board Diagnostic (OBD) of immobilizer after replacing Engine Control Module (ECM)

- For vehicles with automatic transmission, the
kick down function must be learned Page 24
-
161
.
- Generate readiness code Page 01
-82
.

Note:
In the first adaptation phase during engine basic
setting, it is possible that idle will be rough and
vehicle may shake lightly in drive mode.
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24-25

Idle speed (RPM), checking


Special Tools and Equipment

Test requirements:
VAS5051 with VAG5051/1
orVAG1551 with VAG1551/3BExhaust system free of leaks. Coolant Temperature at least 80 C. Electrical consumers switched off (radiator fan must NOT run during
test). A/C switched off. No pressure gauge connected. Vehicles with automatic transmission Selector lever in P or N.
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24-26

Notes:

Idle speed cannot be adjusted.
Idle speed is checked during basic setting of
the engine.
During basic setting, the Evaporative Emission
(EVAP) canister purge regulator valve (EVAP
valve -N80-) is closed and the A/C compressor
is switched off

Test sequence

- Check DTC Memory Page 01
-15
. There must
not be any DTCs stored, repair malfunctions if
necessary, erase DTC memory, switch engine
off and start again, road test vehicle and check
DTC memory again as a control measure.

- Let engine continue to run at idle.

CAUTION!

The electric cooling fan must not run. Rapid data transfer
HELP
Select function XX

When indicated on display:
- Press buttons -0- and -4- to select "Initiate basic setting" and press -Q-
button to confirm input.
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24-27

Basic Settin
g
Q
Input display group number XXX

When indicated on display:
- Press buttons -0-, -5- and -6- to select "display group number 056" and press -Q-
button to confirm input.
System in Basic Setting 56
1
2
3
4

When indicated on display:
- Check whether the engine speed in display field 1 (actual engine speed) is within
tolerated range.

Display fields

1 2 3 4
Display group 056: Idle stabilization with engine at idle and operating temperature
Display
xxx /min
xxx /min x.x % X X X X X
Indicated
Engine speed (actual)
Engine speed
(specified) Idle control
Torque
change Operating conditions
Specified
value 720 to 820 RPM
1)
630 to 730 RPM 2) 770 RPM
1)
680 RPM 2) -5 to 5 % 0 0 0 0 0
Notes
If specified value is not obtained
Page 24
-29

Significance of
numbers
Page 24
-29

1) Front Wheel Drive Vehicles
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2) All-Wheel Drive Vehicles
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24-28

Notes:

Engine speed in display field 1 (actual engine
speed) is the current engine speed.
Engine speed in display field 2 (specified
engine speed) is a theoretical engine speed
calculated by the ECM.
At idle, the ECM always attempts to adapt the
engine speed (actual) to the specified engine
speed (specified).
This means that the engine speed (actual) must
always approximately match the engine speed
(specified) at idle.
Display fields 3 and 4 provide information, but
are not relevant for checking idle speed.
If specified value is obtained:

-
Press button.
Rapid data transfer
HELP
Select function XX

Indicated on display (function selection):
If specified value is not obtained:
- Check DTC memory again Page 01
-15
.
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- If DTC memory was erased, readiness code must be re-generated
Page 01
-82
.
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