AUDI A8 1999 D2 / 1.G AHA Engine On Board Diagnostic Manual PDF

01-52
The following components are actuated in
sequence:

1. Cylinder 1 fuel injector -N30-
2. Cylinder 2 fuel injector -N31-
3. Cylinder 3 fuel injector -N32-
4. Cylinder 4 fuel injector -N33-
5. Cylinder 5 fuel injector -N83-
6. Cylinder 6 fuel injector -N84-
7. EVAP canister purge regulator valve -N80-
8. Secondary AIR solenoid valve -N112-
9. Secondary AIR pump relay -J299-
10.
Intake manifold tuning valve -N156-
(change-over valve)
11.
Camshaft adjustment 1 (Valves -1- and -2-
for camshaft adjustment, -N205- and -N208-
)

Required special tools and testing
equipment

VAG1551 Scan Tool (ST) with VAG1551/3
adapter cable

Test conditions
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Fuse for Engine Control Module (ECM) OK
Closed Throttle Position (CTP) switch -F60-
OK
Fuel pump relay OK
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01-53

Test sequence

- Connect VAG1551/VAG1552 scan tool and
insert "Engine Electronics" address word 01
(ignition on) page 01
-8 .
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -3- to select "Output Diagnostic Test Mode"
function 03.
Rapid data transfer
Q
03 - Output Dia
gnostic Test Mode

Indicated on display
Fuel injectors:
- Press -Q- button to confirm input.
Output Diagnostic Test Mode Cylinder 1 Fuel In
jector-N30

Indicated on display
Note:
The fuel pump relay must be activated, the fuel pump must run, and you
must clearly hear the flow of fuel in the fuel pressure regulator. If the fuel
pump does not run, check fuel pump relay and connections page 24
-
95
.
- Operate throttle valve at throttle body.
As soon as the Closed Throttle Position (CTP) switch opens, cylinder 1
fuel injector must be actuated (click) 5 times.
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01-54
To check remaining fuel injectors:

-
Press button and open the throttle valve
again.
As soon as the Closed Throttle Position (CTP)
switch opens, the applicable fuel injector must
be actuated (click) 5 times.

- Repeat for each fuel injector.
To skip individual tests:

-
Press button to advance through program
sequence. If one or more of the fuel injectors is not
actuated:

- Check fuel injectors page 24
-102
.
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01-55

EVAP canister purge regulator valve -N80-:

-
Press button.Output Diagnostic Test Mode EVAP Canister Pur
ge Re
gulator Valve-N80

Indicated on display
The valve will click until pressing the button to advance the program
sequence.
If the valve is not actuated (does not click):
Secondary Air Injection (AIR) solenoid valve -N112-: - Check EVAP canister purge regulator valve page 24
-116
.
-
Press button.
Output Diagnostic Test Mode Secondar
y Air In
jection Valve-N112

Indicated on display
The valve will click until pressing the button to advance the program
sequence.
If the valve is not actuated (does not click): - Check secondary air injection solenoid valve -N112- Repair Manual,
2.8 Liter V6 5V Engine Mechanical, Repair Group 26.
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01-56

Secondary Air Injection (AIR) pump relay -
J299-:

-
Press button.Output Diagnostic Test Mode Secondary Air Injection Relay-J299

Indicated on display
The relay will be actuated and turn on the secondary AIR pump motor
until pressing the button to advance the program sequence.
If the relay is not actuated (does not click) or the motor does not run:
Intake manifold tuning valve -N156- (change-over valve): - Check secondary air injection pump relay -J299- Repair Manual, 2.8
Liter V6 5V Engine Mechanical, Repair Group 26. -
Press button.
Output Diagnostic Test Mode Intake Manifold Changeover Valve-N156

Indicated on display
The valve will click until pressing the button to advance the program
sequence.
If the valve is not actuated (does not click): - Check intake manifold tuning valve -N156- page 24
-116
.
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01-57

Valves -1- and -2- for camshaft adjustment, -
N205-, -N208-:

-
Press button.Output Diagnostic Test Mode Camshaft Adjustment 1

Indicated on display
Valves 1 and 2 for camshaft adjustment, -N205- and -N208-, are actuated
(click) until pressing the button to advance the program sequence and
end the output DTM.
If one of the valves is not actuated (does not click): - Check valves for camshaft adjustment page 28
-29
-
Press button.
Rapid data transfer
HELP
Select function XX

Indicated on display
Note:
Before selecting "Output Diagnostic Test Mode" function 03 again, switch
off the ignition for approx. 20 seconds.
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01-58

Basic Setting (scan tool function 04)


Notes:

The specified values for the "Basic Setting" and
"Read Measuring Value Block" functions are
described in the respective component test
descriptions.
Disconnecting the battery or the Engine Control
Module (ECM) harness connector will erase all
learned values and the readiness code.
Diagnostic Trouble Code (DTC) memory,
however, will not be erased. After reconnecting
the battery and/or the ECM, the engine may idle
unevenly and there may be some temporary
loss of driveablity. If so, let the engine run at
idle for a few minutes until the learning process
has been completed.
No learning will take place if a malfunction
affecting engine regulation is stored in DTC
memory (this does not include sporadic
malfunctions).
Basic settings are established with the engine
running.
In "Basic Setting" display groups 60 or 98, with
the engine stopped and the ignition switched
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on, adaptation of the throttle valve control
module -J338- takes place. Adaptation of
throttle valve control module -J338- (with "Basic
Setting" function 04 and display group 60)
page 24
-150
.

In "Basic Setting" display groups 88 or 99,
oxygen sensor control is switched off. This
makes it possible to check for malfunctions that
may be caused by oxygen sensor control being
switched on or off. In the selected display
group, press buttons -4- and -8- to switch back
and forth between "Read Measuring Value
Block" function 08 and "Basic Setting" function
04.
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01-59

Notes:
After selecting "Basic Setting" function 04, the
ECM takes the following actions:

EVAP canister purge regulator valve is
closed
A/C compressor is switched of
f

Requirements

Vehicle stationary, engine running at idle
Accelerator pedal not depressed
Selector lever in "P" or "N" position
No malfunctions stored in DTC memory
Engine coolant temperature at least 80 C
(176 F)

All electrical consumers switched off (coolant
fan must not run during test)

A/C switched off (press "-" button on A/C
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