2000 AUDI A4 display

24-36

Function test

- Connect VAG 1551 or VAG 1552 scan tool and
press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (with engine
running at idle) Page 01
-7 .
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block"
function 08, and press -Q- button to confirm input.
Read Measurin
g Value Block
HELP
Input displa
y group number XXX

Indicated on display
- Press buttons -0-, -3- and -6- to input display group number 36, and
press -Q- button to confirm input.
Read Measuring Value Block 36 1 2 3 4

Indicated on display (1-4 = display fields)
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24-37

- Compare display and specified values (display
fields 1 and 2):

Display fields

1 2 3 4
Display group 36: Heated Oxygen Sensor (HO2S) behind Three Way Catalytic Converter (TWC)
Display x.xxx V B1-S2 ON
B1-S2 OFF
Indicates Voltage supply to HO2S behind TWC HO2S behind TWC
ON/OFF
Range 0.000-1.000 V ---
Specified value 0.000-1.000 V
(can oscillate slightly) B1-S2 ON

If not as specified Page 24
-38
, Continuation

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24-38

Continuation
If displayed values are NOT OK (not as
specified):

- Road test to condition oxygen sensor (eliminate
possible contamination) and repeat test.
If the values in display fields 1 and 2 are still
NOT OK:

- Check Oxygen Sensor (O2S) heater Page 24
-
43
.

- Briefly accelerate engine over 3000 RPM.
If the value in display field 1 remains constant:
page Page 24
-39
, Evaluation of display group
36.
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24-39
Evaluation of display group 36 Display group:
36


Display field: 1
Possible causes
Corrective action
approx. 0.435
V
Open circuit in wiring -4- between oxygen sensor and ECM - Check basic voltage Page 24
-40
approx. 0.440
V
Open circuit in wiring -4- between oxygen sensor and ECM
approx. 1.085
V Short circuit to B+ in wiring -4- between oxygen sensor
and ECM - Check wiring for oxygen sensor
Page 24
-41

approx. 0.000
V
Short circuit to Ground in wiring -4- between oxygen
sensor and ECM
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24-44

Checking

- Connect VAG 1551 or VAG 1552 scan tool and
press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (with engine
running at idle) Page 01
-7 .
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block"
function 08, and press -Q- button to confirm input.
Read Measurin
g Value Block
HELP
Input displa
y group number XXX

Indicated on display
- Press buttons -0-, -4- and -1- to input display group number 41, and
press -Q- button to confirm input.
Read Measuring Value Block 41 1 2 3 4

Indicated on display (1-4 = display fields)
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24-45

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

Display fields

1 2 3 4
Display group 41: Oxygen Sensor (O2S) heater, before and after Three Way Catalytic Converter (TWC)
Display
xx.x
Htg.bC.ON/Htg.bC.OFF
xx.x
Htg.aC.ON/Htg.aC.OFF
Indicates Resistance of Oxygen
Sensor (O2S) heater
before TWC O2S heater on
or
O2S heater off
(before TWC) Resistance of oxygen sensor
(O2S) heater
(after TWC) O2S heater on
or
O2S heater off
(after TWC)
Range --- ---
0.0-65.0
---
Specified
value --- ---
4.9-19.9
Htg.aC.ON

--- --- If not as specified Page
24
-46
, Continuation
---
If displayed values are OK (as specified):

-
Press button to advance program
sequence.
-
Press buttons -0- and -6- to select "End Output"
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24-47


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 VW 1594 connector test kit.
- Measure voltage supply and check display in display group 41, display
field 4.
Specified value: 11.0-14.5 volts Specified value: 0.0-12.0 volts (oscillating)
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24-49
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 VW 1594 connector test kit.
- Measure voltage supply and check display in display group 41, 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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