A8 Sedan V8-3.7L (AEW) (1997)
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Connect VAG1551 Scan Tool (ST) to 16-pin Data Link Connector (DLC) using VAG1551/3 adapter cable.
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Start engine.
The on board diagnostic function for A/C control head -E87- begins (address word "08").
Indicated on display
Rapid data transfer
HELP
Select function XX
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Press buttons -0- and -8- to select "Read Measuring Value Block" function 08.
Indicated on display
Rapid data transfer
Q
08 - Read Measuring Value Block
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Press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block
Input display group number XXX
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Input display group number "01" (overview).
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Press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block 1
->
1 2 3 4
NOTE:
Read Measuring Value Block 1
->
0 12.5 V 12.5 V 00
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Display "0" in display field 1 shows the compressor switched on (there is no compressor cut-off condition).
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Table of possible displays in display field 1.
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The voltage for the A/C clutch -N25- is displayed in display field 2 (e.g. 12.5 V).