AUDI A4 1998 B5 / 1.G AWM Engine Readiness Code Owner's Manual

01-93

Work step 5: Check operating condition of
oxygen sensor control

- Start engine (for a vehicle with manual
transmission: engage clutch).

Note:
If necessary, vehicle system "01 - engine
electronics" and diagnostic function "04 -basic
setting" must be selected again after engine
start.

- Install VAG1788/10 RPM adjuster on the
accelerator pedal and raise the engine speed to
2600 RPM.

Test requirement:

Engine running at 2600 RPM.

Display on VAS5051:
-
Click on - button
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01-94


Display on VAS5051:
1 - Enter display group Max. input value = 255
- Select function "030" in button field -2- for "display group number 030"
and press Q button to confirm input.

Display on VAS5051:
Note:
A few minutes may pass until a diagnostic result is reached. - Check oxygen sensor status in display fields -1- and -2-.
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01-95


Display fields

1 2 3 4
Display group 030: Oxygen sensor status
Display
X X X
X X X


Indicated
Oxygen sensor status, bank 1, sensor 1
Oxygen sensor status, bank 2, sensor 1


Functional range
0 = off
1 = on 0 = off
1 = on

Specified value
1 1 1
1 1 0

Significance of 3 digit indications in display group 030 X
X
X
Display fields 1 and 2
X Oxygen sensor control: 0= not active; 1 = active
X Operational readiness of oxygen sensor: 0= not active; 1 = active
X Condition of oxygen sensor heater: 0= not active; 1 = active
Notes:

The first position of the 3 digit indication (heating) fluctuates between 0 and 1 at certain operation points.
Oxygen sensor control of oxygen sensor behind catalytic converter (bank 1, sensor 2) is not active without engine load,
meaning that the third position of the 3-digit display is 0.

-
Do not start test until indication in display field 1
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has reached "111" at least once and indication in
display field 2 has reached "110" at least once.
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Work step 6: Diagnostic of oxygen sensor
aging before catalytic converter

Test requirement:

Engine continues to run at 2600 RPM.

Display on VAS5051:
Note:
A few minutes may pass until a diagnostic result is reached. -
Press button 4 times to change into display group 034.- Check specified value in display field -4-.
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Display fields

1 2 3 4
Display group 034: Oxygen sensor aging diagnostic, oxygen sensor before catalytic converter (bank 1)
Display xxxx/min
xxx C
x.x
---
Indicated Engine speed
(RPM) Exhaust
temperature Dynamic
factor Diagnostic condition
Functional
range Test OFF
Test ON
B1-S2 OK
B1-S2 not OK
Specified
value 2600 RPM larger than 350
C
0.5 to 2.5 B1-S2 OK
Note



If "B1-S1 not OK" is displayed: Check DTC
memory Page 01
-12
.
If specified value "B1-S1 OK" is obtained:

- Perform next work step.
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01-98

Work step 7: Diagnostic of operational
readiness of oxygen sensor behind catalytic
converter

Test requirement:

Engine continues to run at 2600 RPM.

Display on VAS5051:
-
Press button 2 times to change into display group 036.- Check specified value in display field -2-.
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01-99


Display fields

1 2 3 4
Display group 036: Operational readiness of oxygen sensor behind catalytic converter (bank 1)
Display x.xxx V
---

Indicated Oxygen sensor voltage Bank 2,
sensor 1 Diagnostic condition

Functional
range
Test OFF
Test ON
B1-S2 OK
B1-S2 not OK

Specified value 0.100 to 0.950 volts
B1-S2 OK

Note

If "B1-S2 not OK" is displayed: Check DTC memory
Page 01
-12



If specified value B1-S2 OK" is obtained:

- Perform next work step.
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01-100

Work step 8: Diagnostic of oxygen sensor
control system

Test requirement:

Engine continues to run at 2600 RPM.

Display on VAS5051:
-
Press button to change into display group 037.- Check specified value in display field -4-.
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Display fields

1 2 3 4
Display group 037: Diagnostic of oxygen sensor control system (Bank 1)
Display xxx % x.xxx V x.xx
---
Indicated Load Oxygen sensor
voltage Bank 2,
sensor 1 Oxygen sensor correction value
between bank 1, sensor 1 and bank 1,
sensor 2 Diagnostic condition
Functional
range
Test OFF
Test ON
System OK
System not OK
Specified
value 13 to
40 % 0.100 to 0.950 volts smaller than 0.02 System OK
Note



If "System not OK" is displayed:
Check DTC memory Page 01
-
12

If specified value "Syst. OK" is obtained:

- Perform next work step.
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