1999 AUDI A4 check engine

01-101

Readiness code, checking


Test sequence

- Connect vehicle diagnostic, testing and
information system VAS5051 or VAG1551 scan
tool to vehicle and select Control module for
engine electronics "Address Word" 01 Page
01
-9 . The ignition must be switched on.
Rapid data transfer
HELP
Select function XX

When indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block" and
press -Q- button to confirm input.
Read Measurin
g Value Block
Q
Input displa
y group number XXX

When indicated on display
- Press buttons "086" for "display group number 086" and press -Q-
button to confirm input.
Read Measuring Value Block 86
1
2
3
4

When indicated on display
- Check readiness code in display field 1

Specified value: 0 0 0 0 0 0 0 0
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ge 122 of 166 Motronic s
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)
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01-106

Work step 1: Check DTC memory

- Connect Vehicle Diagnostic, Test and
Information system VAS5051 or VAG1551 scan
tool to vehicle and select control module for
engine electronics using "address word" 01
Page 01
-9 . The ignition is switched on.
Rapid data transfer
HELP
Select function XX

When indicated on display
- Press buttons -0- and -2- to select function "Check DTC Memory" and
press -Q- button to confirm input.
X DTC reco
gnized!

Number of stored DTCs or "No DTC recognized" will be indicated on
display.
If a DTC is stored:
If no DTC is stored: - Repair malfunction, erase DTC memory. Road test vehicle and then re-
check DTC memory as a control measure.
-
Press button.
Pa
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01-108

Work step 3: Adaptation Throttle Valve
Control Module to Engine Control Module
(ECM)

Test requirements

Ignition switched on.
Rapid data transfer
HELP
Select function XX

When indicated on display
- Press buttons "04" for the function "Basic Setting" and press Q button
to confirm input.
System in Basic Settin
g
Q
Input displa
y group number XXX

When indicated on display
- Input "060" for "display group number 60" and press Q button to
confirm input.
System in Basic Setting 60
1
2
3
4

When indicated on display
- Check readiness code in display field 3 and 4:
Pa
ge 130 of 166 Motronic s
ystem, On Board Dia
gnostic
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)
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1
2
3
4
Note:
If test is not initiated or the display jumps from "Test ON" to "Test OFF"
slightly accelerate engine briefly, test will be repeated. - Check specified value in display field 4:
Pa
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ystem, On Board Dia
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01-115
If specified value in display field "System OK" is
reached:

- Press -C- button.

Work step 6: Diagnosis of fuel supply system

Test requirements

Engine at idle
Oxygen sensor control active
System in Basic S
ystem
Q
Input display group number XXX

When indicated on display
- Press buttons -1-, -0- and -7- to select display group number 107 and
confirm with -Q- button.
System in Basic Setting 107
1
2
3
4

When indicated on display
Note:
If display "Test ON" does not appear in the display field, switch the engine
off and restart afterward and repeat work step 6. (Diagnostic of fuel supply
system)
After the engine has been started it might be necessary to select "Address
word 01" and initiate the function "04 Basic Setting" again. - Check specified values in display field 4.
Pa
ge 139 of 166 Motronic s
ystem, On Board Dia
gnostic
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)
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pair&id=AUDI.B5.FU04.01.1

01-116


Display fields

1 2 3 4
Display group 107: Diagnostic of fuel supply
Display xxx /RPM x.x % x.x %
Test ON
Indicated Engine speed
(actual) Oxygen sensor control
average value (Bank 1) Oxygen sensor control
average value (Bank 2) Diagnostic condition
Work
range min.: 750 /RPM
max.:
6800 /RPM min.: -25.0 %
max.: 25.0 % min.: -25.0 %
max.: 25.0 % Test OFF
Test ON
Syst. OK
Syst. n OK
Value 750 - 850/RPM -18.0 % to 12.0 % -18.0 % to 12.0 % Syst. OK
Note

If "Syst. n OK" appears, check
DTC memory Page 01
-15
.
Pa
ge 140 of 166 Motronic s
ystem, On Board Dia
gnostic
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)
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01-117
If specified value in display "System OK" is
reached:

- Press -C- button.

Work step 7: Diagnosis of oxygen sensor
heater System in Basic Setting
Q
Input displa
y group number XXX

When indicated on display
- Press buttons -0-, -4- and -1- to select display group number 041 and
confirm with -Q- button.
System in Basic Setting 41
1
2
3
4

When indicated on display
Note:
Increasing engine speed accelerates the obtaining of specified values. - Check specified value in display field 1 and 3:
Pa
ge 141 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
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01-120

Work step 8: Diagnosis oxygen sensor aging
before catalytic converter

Test requirements

Engine running at 1900 - 2200 RPM
System in Basic Settin
g
Q
Input display group number XXX

Indicated on display
- Press buttons -0-, -3- and -4- to select "display group number 034" and
confirm with -Q- button.
System in Basic Setting 34
1
2
3
4

Indicated on display
- Check specified value in display field 4:
Pa
ge 146 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.01.1