1998 AUDI A4 AFC Engine On Board Diagnostic Multiport Fuel Injection Workshop Manual

Note:
After pressing the HELP button, an overview of the possible functions is
printed out.
- Press buttons -0- and -3- to select "Output Diagnostic Test Mode"
function 03.
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Rapid data transfer
Q
03 - Output Diagnostic Test Mode

Indicated on display
- Press -Q- button to confirm input.
Output diagnostic test mode Fuel Pump
(FP) Rela
y -J17

Indicated on display
The fuel pump relay must be triggers and the fuel pump must run; the
flowing noise at the fuel pressure regulator can be clearly heard.
- If fuel pump relay is not triggered, check control page 24
-24
.
-
Press button.
Output diagnostic test mode Idle Air Control
(IAC
) valve -N71

Indicated on display
This valve is triggered (clicks) until moving on to the next output by
pressing the button. - If the valve is not triggered (does not click), check -N71- page 24
-
37
.
-
Press button.
Output diagnostic test mode Intake manifold chan
ge-over valve -N156

Indicated on display
This valve is triggered (clicks) until you move on to the next output by
pressing the button. - If the valve is not triggered (does not click), check intake manifold
change-over valve -N156- page 24
-64
.
-
Press button.
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01-148

Output diagnostic test mode Evaporative Emission
(EVAP
) canister pur
ge re
gulator valve -N80

Indicated on display
This valve is triggered (clicks) until you move on to the next output by
pressing the button. - If the valve is not triggered (does not click), check EVAP canister
purge regulator valve -N80- page 24
-58
.
-
Press button.
Output diagnostic test mode EGR vacuum re
gulator solenoid valve -N18

Indicated on display
This valve is triggered (clicks) until you move on to the next output by
pressing the button. - If the valve is not triggered (does not click), check EGR vacuum
regulator solenoid valve -N18- page 24
-67
.
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Only on vehicles with secondary air injection
(AIR) system Output diagnostic test mode Secondar
y Air In
jection
(AIR
) solenoid valve -N112

Indicated on display
This valve is triggered (clicks) until you move on to the next output by
pressing the button. - If the valve is not triggered (does not click), check -N112-.
Output diagnostic test mode Secondar
y Air In
jection
(AIR
) pump rela
y -J299

Indicated on display
The secondary air injection pump relay -J299- triggers the secondary air
pump motor and it runs until the output DTM is ended by pushing the
button (maximum 10 sec.). - If secondary air injection pump motor does not run, check engine and -
J299-.
-
Press button.
Rapid data transfer
HELP
Select function XX

Indicated on display
Note:
Before selecting "Output Diagnostic Test Mode" function 03 again, switch
ignition off for approx. 20 sec.
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01-150

Basic Setting (scan tool function 04)


Notes:

Basic setting is carried out with engine
running.
The OBD II engine control module shows the
"Readiness Code" in display group 29. The
readiness code is reset when the engine control
module power is off and each time the DTC
memory is erased. In order to regenerate the
readiness code it is necessary to take a trip in
"mixed city and highway" driving-approx. 1-1/2
to 5 minute drive at 80-100 km/h (50-63 mph)
with manual transmission in 4th or 5th gear,
preferably 4th gear, or automatic transmission
selector lever in "D" position.
When the "Basic Setting" function 04 is initiated
with the VAG 1551 scan tool, the learning
values are relearned in systems capable of
learning. Learning is prohibited, as soon as a
malfunction is stored in the DTC memory that
relates to a system capable of learning (not with
sporadic malfunctions).
All learning values are erased by disconnecting
the connector from the Engine Control Module
(ECM). After that, uneven idle can occur briefly.
In this case, let engine run in idle for a few
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minutes until the learning process is completed.
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Note:
After function 04 is called up, the Engine Control
Module (ECM) carries out the following
operations:

Constant ignition timing point of 12 BTDC is
output in idle.

Digital idle speed control is blocked.
Evaporative emissions canister purge regulator
valve is closed.
A/C compressor is switched off.
EGR vacuum regulator solenoid valve is
closed
No coolant temperature correction-fixed value
of 80 C (176 F)

Learning values are relearned (idle and CO
content are adjusted automatically)
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Requirements:

Engine temperature at least 85 C (185 F)

Do not operate accelerator pedal
All electrical consumers switched off
A/C system switched off. Push minus (-)
button for A/C fresh air fan repeatedly until
all the displays are cleared
Move selector lever to P or N
No malfunctions in Diagnostic Trouble Code
(DTC) memory
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