display AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual

24-18

Checking

- 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 displa
y group number XXX

Indicated on display
- Press buttons -0-, -0- and -1- to input display group number 1 (001),
and press -Q- button to confirm input.
System in Basic Setting 1 1 2 3 4

Indicated on display (1-4 = display fields)
Note:
After selecting function 04, the ECM initiates the following:
EVAP canister purge regulator valve is closedA/C compressor is switched of
f
- Briefly raise engine speed (acceleration burst) and let engine run at idle
for another 2 minutes.
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24-19

- Compare display with specified values (display
fields 1-4):

Display fields

1 2 3 4
Display group 1: Engine idle speed
Display xxxx RPM
xx.x C
xx.x% xx.x %
Indicates Idle speed
(in 40 RPM steps) Engine Coolant
Temperature (ECT) Oxygen Sensor
(O2S) control, Bank
1 Oxygen Sensor
(O2S) control, Bank
2
Range 0 - 6800 RPM
-48.0 - 143.2 C
(-54 - 289 F)
-25.0 to +25.0 % -25.0 to +25.0 %
Specified
value 620 - 740 RPM
(all-wheel drive) 80.0 - 105.0 C
(176 - 221 F) -10.0 to +10.0 %
value must change by
at least 2 % -10.0 to +10.0 %
value must change by
at least 2 %
740 - 860 RPM
(front-wheel drive)

If not as specified Evaluation of
display group 1 page 24
-21

--- If not as specified:
- Check HO2S and O2S control before TWC
page 24
-22

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24-20
If displayed values are OK (as specified):

-
Press button.
- Press buttons -0- and -6- to insert "End Output"
address word 06, and press -Q- button to
confirm input.

- 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
.

Note:
The increased idle speed for vehicles with front-
wheel drive is achieved if there is voltage (from
terminal 15er) supplied to terminal 10 of the
Engine Control Module (ECM).
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24-21
Evaluation of display group 1 Display
Group: 1


Display
field: 1
Possible malfunction cause
Corrective action
less than
620
(all-wheel
drive)
or
less than
740
(front-wheel
drive)
Driving mode engaged
Adaptation of throttle valve control module -J338- to
engine control module cannot be conducted
Throttle valve control module malfunction- Move selector lever into "P" or "N" position
- Carry out adaptation of throttle valve control
module -J338- to ECM page 24
-150

- Check -J338- page 24
-128
less than
740
(front-wheel
drive)
B+ (15) to terminal 10 of ECM missing- Check voltage supply to terminal 10 on ECM
per wiring diagram
greater than
740
(all-wheel
drive) Adaptation of throttle valve control module -J338- to
engine control module cannot be conducted
Closed Throttle Position (CTP) switch open
Throttle valve control module malfunction- Carry out adaptation of throttle valve control
module -J338- to ECM page 24
-150

- Check -J338- page 24
-128
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24-23

Checking

- 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 -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 -2- to input display group number 32 (032),
and press -Q- button to confirm input.
Read Measuring Value Block 32 1 2 3 4

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

- Check learning values for Oxygen Sensor (O2S)
control before TWC (display fields 1-4):

Display fields

1 2 3 4
Display group 32: Oxygen Sensor (O2S) control learning values (before TWC)
Display xx.x % xx.x % xx.x % xx.x %
Indicates O2S control learning
value at idle (additive)
(before TWC)
Bank 1, Sensor 1 O2S control learning value at
part load (multiplicative)
(before TWC)
Bank 1, Sensor 1 O2S control learning
value at idle (additive)
(before TWC)
Bank 2, Sensor 1 O2S control learning value at
part load (multiplicative)
(before TWC)
Bank 2, Sensor 1
Range -25.0 to +25.0 % -25.0 to +25.0 % -25.0 to +25.0 % -25.0 to +25.0 %
Specified
value -10.0 to +10.0 %
(can vary slightly) -10.0 to +10.0 %
(can vary slightly) -10.0 to +10.0 %
(can vary slightly) -10.0 to +10.0 %
(can vary slightly)
If not as specified Evaluation of display group 32, page 24
-27

If displayed values are OK (as specified):

- Press -C- button.

- Press buttons -0-, -3- and -3- to input display
group number 33, and press -Q- button to
confirm input.
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Read Measuring Value Block 33 1 2 3 4

Indicated on display (1-4 = display fields)
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24-25

- Check Oxygen Sensor (O2S) control before
TWC (display fields 1-4):

Display fields

1 2 3 4
Display group 33: Oxygen Sensor (O2S) control (before TWC)
Display xx.x % x.xxx V xx.x % x.xxx V
Indicates O2S control
Bank 1, Sensor 1
(before TWC) O2S voltage
Bank 1, Sensor 1
(before TWC) O2S control
Bank 2, Sensor 1
(before TWC) O2S voltage
Bank 1, Sensor 1
(before TWC)
Range -25.0 to +25.0 % 0.000-1.000 V -25.0 to +25.0 % 0.000-1.000 V
Specified
value -10.0 to +10.0 %
value must change by
at least 2 % 0.000 to 1.000 V
value must fluctuate at least
30 times per minute, and
change by at least 0.3 volts -10.0 to +10.0 %
value must change by
at least 2 % 0.000 to 1.000 V
value must fluctuate at least
30 times per minute, and
change by at least 0.3 volts

If not as specified
page 24
-26
,
Continuation
If not as specified page 24
-
28
, Evaluation of display
group 33
If not as specified
page 24
-26
,
Continuation
If not as specified page 24
-
28
, Evaluation of display
group 33
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24-26

Continuation
If the value in either display field 1 or 3 is NOT
OK, or if the value does not fluctuate by at least 2
%:

- Road test to condition oxygen sensor(s)
(eliminate possible contamination) and repeat
test.
If the value in either display field 1 or 3 is still
NOT OK, or if it still does not fluctuate by at least
2 %:

- Check Oxygen Sensor (O2S) heater(s) page
24
-34
.
If the value in either display field 1 or 3 remains
constant:

- Check oxygen sensor voltage(s) (display fields 2
and 4).

-
Press button.
- Press buttons -0- and -6- to select "End Output"
function 06, and press -Q- button to confirm
input.

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24-27
Evaluation of display group 32 Display group:
32


Display fields:
1-4
Possible malfunction cause
Corrective action
O2S control
learning value:
-25.0 to -10.0
%
Engine oil dilution (when part load learning value is
normal display fields 2 and 4)
- Change engine oil, or carry out extensive
road test and check again


Fuel pressure too high- Check fuel pressure regulator page 24
-
111



Fuel injector leaking- Check fuel injectors page 24
-102


Oxygen Sensor (O2S) heater malfunction- Check O2S heater page 24
-34
O2S control
learning value:
10.0 to 25.0 %
Intake air leaks ("false air") or exhaust manifold leaks
(when partial load learning value is normal display
fields 2 and 4)
- Check intake air system for leaks page 24
-126

- Check exhaust system for leaks Repair
Manual, 2.8 Liter V6 5V General, Engine,
Repair Group 26


Fuel pressure too low- Check fuel pressure regulator page 24
-
111



Oxygen Sensor (O2S) heater malfunction- Check O2S heater page 24
-34
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