A8L V8-4.2L (BFM) (2004)
High Pressure Safety Valve HVAC: Testing and Inspection
A/C Compressor Regulator Valve, Checking Activation Signal
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Switch off ignition.
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Unplug connector at air-conditioner compressor.
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Reproduce the connection between connector - A - and connector - B - at regulator valve using an adapter cable from Connector Test Kit (V.A.G
1594 C).
‹› The activation of the A/C Compressor Regulator Valve (N280) and the current flowing via the A/C Compressor Regulator Valve (N280) is
measured by the Climatronic Control Module (J255) front A/C control head is displayed in the control head measured value block Vehicle
diagnosis, testing and information system VAS 5051 in "Guided Fault Finding" function.
‹› An adapter cable can also be used for this test. To do this, use one connector each - A - and - B - (part number 1J0 973 702 and 1J0 973 802 and
relevant terminal contacts, two standard sockets for banana connectors - C - and two wires with 0.5 mm 2 diameter.
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Connect DSO Measuring Leads 1 & 2 (VAS 5051/8) to adapter leads.
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Measuring cable (signal wire) to terminal - 2 -.
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Measuring cable (shielded, ground) to terminal - 1 -.
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On Diagnostic Operation System (VAS 5051 A), set measurement mode: DSO (Digital Storage Oscilloscope)
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Setting 5V/Div = 0.5 ms/Div (5 volts DC and 0.5 milliseconds per unit)
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Start engine.