display AUDI A4 1998 B5 / 1.G AEB Engine Turbocharger Boost Control And Checking

24-123


Turbocharger boost controls,
checking

Boost pressure regulation, 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 -1-, -1- and -4- to input display group number 114, and
press -Q- button to confirm input.
Read Measuring Value Block 114 1 2 3 4

Indicated on display (1-4 = display fields)
WARNING!
A second technician is required to operate the VAG 1551 scan tool
during the road test. - Road test car at wide open throttle at 4000 RPM.
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- Compare display with specified value for
wastegate bypass regulator valve duty cycle in
display field 4:

Specified value: 5-95 %
If displayed value is OK:

- Change engine RPM until duty cycle is within
specified value.

- Compare display with specified value for
corrected specific engine load in display field 2:

Specified value: 3.00-8.00 ms

- Compare display with specified value for actual
engine load in display field 3:

Specified value: must be same as corrected
specified engine load in display field 2 (with
tolerance of 0.50 ms)
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Display fields

1 2 3 4
Display group 114: Boost pressure regulation
Display xx.xx ms xx.xx ms xx.xx ms xx %
Indicates Specified
engine load Corrected specified
engine load Actual engine load Duty cycle of wastegate
bypass regulator valve
Range --- --- --- 0-99 %
Specified
value --- 3.00-8.00 ms Same as corrected specific engine load in
display field 2 (tolerance 0.50 ms)
5-99 %
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- 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
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- 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 -1-, -1- and -3- to input display group number 113, and press -Q-
button to confirm input.
Read Measuring Value Block 113 1 2 3 4

Indicated on display (1-4 = display fields)
- Compare displayed value with specified air pressure value (display field 4):

Display fields

1 2 3 4
Display group 113: Boost pressure regulation
Display xxx RPM xx.xx ms
xxx
xxxx mbar
1)

Indicates Engine speed
(in 40 RPM steps) Engine load Throttle valve angle Air pressure
Range 0-6800 RPM 0.00-8.50 ms
0-90
559-1118 mbar
Specified value 0 RPM 0.00 ms
0-5 0 m
400 m
1000 m
1013 mbar
970 mbar
900 mbar
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- Check air pressure with turbocharger tester VAG
1597/A (actual pressure indication) and compare
with displayed value.
If the displayed value is so high or low that it
seems implausible for the altitude or the air
pressure:

- Check wiring and terminals for excessive
resistance Page 24
-134
.
If displayed value is NOT OK:

- Check readiness code Page 01
-59
. If
Diagnostic Trouble Code (DTC) memory has
been erased, or ECM was disconnected,
generate new readiness code Page 01
-62
.

-
Press button to advance program
sequence.
- Press buttons -0- and -6- to select "End Output"
function 06, and press -Q- button to confirm
input.
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- Check wiring for short circuits between terminals
of 3-pin connector, and between connector and
ECM/test box.


Connector terminal 2 to ECM/test box
socket 61

Connector terminal 3 to ECM/test box
socket 61

Connector terminal 3 to ECM/test box
socket 62

Specified value:
If wiring is OK:

- Replace Barometric Pressure (BARO) sensor.
If an implausible value is still displayed after
replacing the barometric pressure sensor:

- Replace Motronic ECM -J220- Page 01
-57
.

- Carry out adaptation of throttle valve control
module to ECM Page 24
-119
.

-
Check readiness code Page 01
-59
. If
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