Q7 Quattro V6-3.6L (BHK) (2007)
Expansion Valve: Testing and Inspection
A/C Compressor Regulator Valve, Checking Switch-On Signal
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Switch off ignition.
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Remove noise insulation
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Disconnect harness connector on A/C 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).
‹› Activation of A/C Compressor Regulator Valve (N280) and current flowing via A/C Compressor Regulator Valve (N280) measured by front A/C
control head Climatronic Control Module (J255) is displayed in measuring value block of front A/C control head Climatronic Control Module
(J255) (display group "001").
‹› If connectors to A/C Compressor Regulator Valve (N280) and to electric engine mount are interchanged, no DTC is entered in DTC memory,
however the evaporator may ice-up since the compressor is actuated continuously.
‹› You can create an adapter cable for this test. To do this, e.g. 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 lead (signal wire) to wire to connector terminal - 2 -.
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Measuring lead (shielding, Ground) to wire to connector terminal - 1 -.