Passat Syncro Wagon V6-2771cc 2.8L DOHC (AHA) (1998)
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Observe display in display field 4.
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Specified value: Compr. OFF
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Switch A/C system on.
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Select lowest temperature and highest blower speed.
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Observe display in display field 4.
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Specified value: Compr. ON
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Briefly press accelerator pedal to floor and release (short throttle burst).
When quickly pressing the accelerator pedal down the value in display field 4 must change from "Compr. ON" to "Compr. OFF" for a few seconds
(compressor cut-off for vehicle acceleration).
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Press -> button.
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Press buttons -0- and -6- to select "End Output" function 06, and press -Q- button to confirm input.
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Switch ignition off.
NOTE: The air conditioner compressor will be switched off (Compr.OFF) when the engine control module recognizes full load and the air
conditioning is switched on (A/C-HIGH).
Continuation
If the displayed values are NOT OK:
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Connect VAG1598/22 test box to ECM harness connector.
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Check wiring for open circuit between ECM/test box terminal 8 and A/C control head.
If the wiring is OK: