display AUDI A8 1999 D2 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Owner's Manual

24-54

- Compare display and specified values (display
fields 3 and 4):

Display fields

1 2 3 4
Display group 40: Oxygen Sensor (O2S) heating (before and after TWC)
Display
xx.x
Htg.bC.ON/Htg.bC.OFF
xx.x
Htg.aC.ON/Htg.aC.OFF
Indicates Resistance of O2S heater
(before TWC)
(B1-S1 and B2-S1) O2S heater ON
or
O2S heater OFF
(before TWC)
(B1-S1 and B2-S1) Resistance of O2S heater
(after TWC)
(B1-S2 and B2-S2) O2S heater ON
or
O2S heater OFF
(after TWC)
(B1-S2 and B2-S2)
Range --- ---
0.0 - 65.0
---
Specified value --- ---
2.4 - 9.2
Htg.aC.ON

--- --- If not as specified page 24
-55
, Continuation
If displayed values are OK (as specified):

-
Press button.
-
Press buttons -0- and -6- to select "End Output"
function 06, and press -Q- button to confirm
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If display = Htg.aC.ON:
If display is switching between "Htg.aC.ON" and "Htg.aC.OFF" - Connect multimeter between harness connector terminals 1 and 2 (to
ECM), using VW1594 connector test kit.
- Measure voltage supply and check display in display group 40, display
field 4.
Specified value: 11.0-14.5 volts Specified value: 0.0-12.0 volts (oscillating)
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If there is voltage:

If display = Htg.aC.ON:
If display switches between "Htg.aC.ON" and "Htg.aC.OFF:" - Connect multimeter between harness connector terminal 2 (to ECM)
and Battery Positive Voltage (B+), using VW1594 connector test kit.
- Measure voltage supply and check display in display group 40, display
field 4.
Specified value: 11.0-14.5 volts Specified value: 0.0-12.0 volts (oscillating)
- Switch ignition off.
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Oxygen Sensor (O2S) aging, bank 1,
sensor 1, checking


Required special tools and test equipment

VAG1551 or VAG1552 Scan Tool (ST) with
VAG1551/3 adapter cable

Test requirements
Engine Coolant Temperature (ECT) at least
80 C (176 F)

Function test

- Connect VAG1551 or VAG1552 scan tool and
press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (with engine
running at idle) page 01
-8 .
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -4- to select "Basic Setting" function 04, and
press -Q- button to confirm input.
System in Basic Settin
g
HELP
Input display group number XXX

Indicated on display
- Press buttons -0-, -3- and -4- to input display group number 34 (034),
and press -Q- button to confirm input.
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System in Basic Setting 34 1 2 3 4

Indicated on display (1-4 = display fields)
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- Increase engine speed to 1800-2200 RPM.

- Maintain engine speed at 1800-2200 RPM until
display field 4 changes from "Test OFF" to "Test
ON."

- Maintain engine speed at 1800-2200 RPM and
compare display with specified values for
oxygen sensor aging (before TWC) in display
fields 3 and 4).

Note:
To be sure that the temperature is within the
specified range, the specified RPM has to be
maintained for at least 1 minute.

Display fields

1 2 3 4
Display group 34: Oxygen sensor aging (time period check of oxygen sensor) bank 1, sensor 1
Display xxxx RPM xx.xx ms xx.xx s Test OFF/Test ON
B1-S1 OK/B1-S1 n.OK
Indicates Engine speed
(in 40 RPM steps) Engine load Time period
Bank 1, Sensor 1 Diagnostic status
Diagnostic result
Range 0 - 6800 RPM 0.00 - 12.75 ms --- ---
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Continuation
If displayed value is NOT OK (not as specified):

- Road test to condition oxygen sensor (eliminate
possible contamination) and repeat test.
If displayed value is still NOT OK:

- Replace HO2S -G39-.

- Check readiness code page 01
-70
. If
Diagnostic Trouble Code (DTC) memory has
been erased, or ECM was disconnected,
generate new readiness code page 01
-73
.
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Oxygen Sensor (O2S) aging, bank 2,
sensor 1, checking


Required special tools and test equipment

VAG1551 or VAG1552 Scan Tool (ST) with
VAG1551/3 adapter cable

Test requirements
Engine Coolant Temperature (ECT) at least
80 C (176 F)

Function test

- Connect VAG1551 or VAG1552 scan tool and
press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (with engine
running at idle) page 01
-8 .
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -4- to select "Basic Setting" function 04, and
press -Q- button to confirm input.
System in Basic Settin
g
HELP
Input display group number XXX

Indicated on display
- Press buttons -0-, -3- and -5- to input display group number 35 (035),
and press -Q- button to confirm input.
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System in Basic Setting 35 1 2 3 4

Indicated on display (1-4 = display fields)
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- Increase engine speed to 1800-2200 RPM.

- Maintain engine speed at 1800-2200 RPM until
display field 4 changes from "Test OFF" to "Test
ON."

- Maintain engine speed at 1800-2200 RPM and
compare display with specified values for
oxygen sensor aging (before TWC) in display
fields 3 and 4).

Note:
To be sure that the temperature is within the
specified range, the specified RPM has to be
maintained for at least 1 minute.

Display fields

1 2 3 4
Display group 35: Oxygen sensor aging (time period check of oxygen sensor) bank 2, sensor 1
Display xxxx RPM xx.xx ms xx.xx s Test OFF/Test ON
B2-S1 OK/B2-S1 n.OK
Indicates Engine speed
(in 40 RPM steps) Engine load Time period
Bank 2, Sensor 1 Diagnostic status
Diagnostic result
Range 0 - 6800 RPM 0.00 - 12.75 ms --- ---
Pa
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11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU03.24.1