Q7 Quattro V6-3.6L (BHK) (2007)
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Ignition switched on (B+ at terminal "3" and Ground (GND) terminal "1" on High Pressure Sensor (G65) present)
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Setting on oscilloscope: 5 V/Div. = (5V per unit DC voltage) 5 ms / Div. (5 milliseconds per unit)
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Measuring lead (signal wire) connected to terminal "2" on High Pressure Sensor (G65).
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Measuring lead (shielding) connected to terminal "1" (Ground -GND- on High Pressure Sensor (G65)).
‹› To connect High Pressure Sensor (G65), e.g. measuring leads from connector test kit (V.A.G 1594 C) may be used.
‹› The display shows a signal that is transferred when the pressure in the refrigerant circuit is approximately 7 bar, it corresponds to an approximate
duty cycle of 25% (with compressor not engaged, an ambient temperature of 30 °C and properly filled refrigerant circuit).
‹› The impulse width - A - depends on the pressure in the refrigerant circuit (if pressure increases, area - A - gets wider).
‹› The signal distance - B - is always 20 milliseconds (corresponds to frequency of 50 Hertz).
‹› The duty cycle is determined by the ratio of impulse width - A - and signal distance - B -.