display AUDI A8 2000 D2 / 1.G AHA Engine Auxiliary Signals Checking Workshop Manual
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Page 3 of 22

24-165
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-, -5- and -0- to input display group number 50 (050),
and press -Q- button to confirm input.
Read Measuring Value Block 50 1 2 3 4
Indicated on display (1-4 = display fields)
- Switch on A/C (lowest temperature and highest fan position).
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24-166
- Compare display with specified values for A/C
(in display field 4).
Display fields
1 2 3 4
Display group 50: Signals to Engine Control Module (ECM)
Display xxxx RPM xxxx RPM A/C-LOW
A/C-HIGH Compr. ON
Compr. OFF
Indicates Actual engine
speed
(in 10 RPM steps) Specified engine
speed
(in 10 RPM steps) IAC boost A/C compressor status
Range 0 - 2550 RPM --- --- ---
Specified
value 620 - 740 RPM
(all-wheel drive)
or
740 - 860 RPM
(front-wheel drive) 680 RPM
(all-wheel drive)
or
800 RPM
(front-wheel drive) A/C-LOW
(all-wheel drive)
or
A/C-HIGH
(front-wheel
drive) Compressor on: Comp. ON
Compressor off: Comp. OFF
--- --- --- If not as specified page 24
-167
,
Continuation
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24-167
Continuation
If the displayed values are NOT OK:
- Connect VAG1598/22 test box to ECM harness
connector page 01
-67
.
- Check wiring for open circuit, short circuit to B+
or short circuit to Ground between ECM/test box
terminal 8 and either A/C control head -E87- or
Transmission Control Module (TCM).
Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder If the wiring is OK:
- Check function of A/C control head -E87-.
Repair Manual, Heating & Air Conditioning,
Repair Group 01
- Carry out electrical testing of automatic
transmission.
Repair Manual, 5 Spd. Automatic
Transmission 01V, Repair Group 01
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Page 10 of 22

24-169
Test procedure
- 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-, -0- and -5- to input display group number 5 (005),
and press -Q- button to confirm input.
Read Measuring Value Block 5 1 2 3 4
Indicated on display (1-4 = display fields)
- Road test and compare indicated vehicle speed with value in display
field 3 (2nd technician required, Safety precautions page 24
-9 ).
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24-170
Display fields
1 2 3 4
Display group 5: General engine data
Display xxx RPM xx.xx ms xxx km/h Idle
Part throt
Full throt
Decel
Enrich
Indicates Engine speed
(in 40 RPM
steps) Engine load Vehicle speed Operating
condition
Range 0 - 6800 RPM 0.00 - 12.75
ms 0 - 326 km/h ---
Specified
value --- --- Approx. vehicle speed ---
--- --- If no vehicle speed is displayed page 24
-171
,
Continuation
---
If displayed value is OK:
-
Press button.
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