buttons AUDI A4 2000 B5 / 1.G APB Engine Oxygen Sensor Control Checking User Guide

24-108

Checking oxygen sensor control behind
catalytic converter

- Carry out road test for approx.: 10 minutes.Basic Setting
Q
Input displa
y group number XXX

Indicated on display
- Press buttons -0-, -3- and -7- to select "display group number 037" and
press -Q- button to confirm input.
System in Basic Setting 37
1
2
3
4

Indicated on display
- Check oxygen sensor voltage in display field 2.
- Check dwell time (hold up) between oxygen sensor 1 before catalytic
converter and oxygen sensor 2 behind catalytic converter in display
field 3 and diagnostic result in display field 4.
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24-110

- Press -C- button.

- Press buttons -0-, -3- and -8- to select "display
group number 038" and press -Q- button to
confirm input. System in Basic Setting 38
1
2
3
4

Indicated on display: (1 - 4 display fields)
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24-114

Oxygen sensor heater for oxygen
sensor, checking


Note:
The oxygen sensor heating circuit is monitored
by the On Board Diagnostic (OBD). Check DTC
memory Page 01-15
.

- Connect vehicle diagnostic, testing and
information system VAS5051 or VAG1551 scan
tool and select engine electronics control
module by entering address word "01" Page
01
-9 . When doing this the engine must be at
idle.
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -8- to select function "Read Measuring Value
Block" and confirm entry with -Q- button.
Read Measurin
g Value Block
Input display group number XXX

Indicated on display
- Press buttons -0-, -4- and -1- to select "display group number 041" and
confirm entry with -Q- button.
Read Measuring Value Block 41
1
2
3
4

Indicated on display
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24-115

- Adjust engine speed to approx: 3000 RPM

- Check resistance of oxygen sensor heater.

Display fields

1 2 3 4
Display Group 041: Oxygen sensor heater, Bank 1 (at idle speed)
Display
xxx kOhm
Htg.bC.ON
xxx kOhm
Htg.aC.ON
Indicates
Bank 1, Sensor 1
Status of
heater Bank 1, Sensor 2
Status of
heater
Range
Htg.bC.ON
Htg.bC.OFF
Htg.aC.ON
Htg.aC.OFF
Specified
value 0 - 0.5 kOhm
Htg.bC.ON/OFF
0 - 0.5 kOhm
Htg.aC.ON/OFF
Note
It can take a few minutes until
specification are obtained
It can take a few minutes until
specified values are obtained
- Press -C- button.

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