display AUDI A4 1998 B5 / 1.G APB Engine Motronic Syst

01-112
If the specified value "EVAP OK" is reached:

- Press -C- button

Work step 5: Diagnosis of tank leak test

Note:
This diagnostic is locked the first 230 seconds
after engine is started.

Test requirements

Engine at idle
Coolant temperature greater 85 C (Display
group 4, display field 3)

Intake air temperature less 95 C (Display
group 4, display field 4)
System in Basic System
Q
Input displa
y group number XXX

When indicated on display
- Press buttons -0-, -7- and -1- to select display group number "071" and
press -Q- button to confirm input.
Pa
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01-113

System in Basic Setting 71
1
2
3
4

When indicated on display
During test is "Test ON" displayed in display field 4. Continue to hold test
conditions until a diagnostic result is displayed in display field 4.
Note: - Check specified value in display field 4:
Test duration for tank leak test takes approximately 60 seconds.Should the diagnosis be repeated several times, open fuel filler cap
each time to release pressure in tank.
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01-114


Display fields

1 2 3 4
Display group 071: Diagnostic of tank leak test
Display Reed open --- System Test
Test ON
Indicated Condition Reed-
contact malfunction
message System
condition Diagnostic condition and Diagnostic result
Work range Reed open
Reed closed Small leak
Large leak
System not OK System Test
Measurement
Measurement
END Test OFF
Test ON
Syst. OK
Syst. not OK
Abort
Specified
value Reed open --- Measurement
END Syst. OK
Note



If "System not OK" is displayed: Check DTC
memory Page 01
-15
.
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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
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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
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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
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01-118


Display fields

1 2 3 4
Display group 041: Oxygen sensor heater, bank 1
Display
xxx kOhm
Heater before before CAT
ON xxx kOhm
Heater before behind CAT
ON
Indicated
Bank 1, Sensor 1
Condition of heater
Bank 1, Sensor 2
Condition of heater
Work range
Heater b. CAT ON
Heater b. TWC OFF
Heater a. CAT ON
Heater a. CAT OFF
Specified
value 0 - 0.5 kOhm
Heater b. CAT ON/OFF
0 - 0.9 kOhm
Heater a. CAT ON/OFF Important note for display fields 1,2,3 and 4:

Display fields 1 and 3 will not indicate any value if the operating temperature of the oxygen sensors is not reached, that
means both fields are empty. (Increase Engine Speed to reach specified value).
After the operating temperature is reached, the display fields 1 and 3 must display a value of less than 0.5K Ohm
Only proceed with test after value of less than 0.5K Ohm is displayed with in display fields 1 and 3.
The Engine Control Module (ECM) cycles at certain operating conditions the oxygen sensor heating, that means, the
heater is certain operating conditions ON or OFF. It is therefore possible that the specification in display field 2 and 4
appears periodically as "Heater b. CAT OFF" or "Heater a. CAT OFF"
Pa
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- Press -C- button.

- Press buttons -0-, -4- and -2- to select "display
group number 042" and confirm input with -Q-
button.
Pa
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01-119


Display fields

1 2 3 4
Display group 042: Oxygen sensor heater, bank 1
Display
xxx kOhm
Heater before before CAT
ON xxx kOhm
Heater before behind CAT
ON
Indicated
Bank 1, Sensor 1
Condition of heater
Bank 1, Sensor 2
Condition of heater
Work range
Heater b. CAT ON
Heater b. TWC OFF
Heater a. CAT ON
Heater a. CAT OFF
Specified
value 0 - 0.5 kOhm
Heater b. CAT ON/OFF
0 - 0.9 kOhm
Heater a. CAT ON/OFF
Note
Observe note
below
Observe note
below Important note for display fields 1,2,3 and 4:

Display fields 1 and 3 will not indicate any value if the operating temperature of the oxygen sensors is not reached, that
means both fields are empty. (Increase Engine Speed to reach specified value).
After the operating temperature is reached, the display fields 1 and 3 must display a value of less than 0.5K Ohm
Only proceed with test after value of less than 0.5K Ohm is displayed with in display fields 1 and 3.
Pa
ge 144 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
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yp
e=re
pair&id=AUDI.B5.FU04.01.1

The Engine Control Module (ECM) cycles at certain operating conditions the oxygen sensor heating, that means, the
heater is certain operating conditions ON or OFF. It is therefore possible that the specification in display field 2 and 4
appears periodically as "Heater b. CAT OFF" or "Heater a. CAT OFF"

- Press -C- button.
Pa
ge 145 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
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play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.01.1