Passat Sedan V6-2792cc 2.8L DOHC (AAA) SFI (1997)
A/C Signal: Testing and Inspection
Special tools, testers and auxiliary items
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VAG 1551/1552 scan tool with VAG 1551/3 adapter cable.
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VAG 1598/18 test box.
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Multimeter (Fluke 83 or equivalent).
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Connector test kit VW 1594.
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Wiring diagram.
Check conditions:
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Function of A/C OK.
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A/C switched off.
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Interior of vehicle is at room temperature (above 15°C (59°F)).
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No malfunctions stored in DTC memory See checking DTC memory. See: Testing and Inspection
Test sequence:
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Engine running at idle.
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Connect VAG 1551/1552 scan tool and select "Engine Electronics" address word 01. See: Testing and Inspection
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.
Indicated on display
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Press buttons -0-, -0- and -8- to input display group 008 and press -Q- button to confirm input.
Indicated on display (1-4 = Display fields)
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Switch on A/C (lowest temperature and highest blower speed).
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Check specifications for A/C (display fields 3 and 4).
NOTE:
The A/C compressor will be switched off (Compr. OFF) when the ECM recognized full load and the air conditioning is switched on (A/C-HIGH).
Continuation:
If the display does not indicate as described: