A4 V6-3.0L (AVK) (2004)
High Pressure Sensor / Switch: Testing and Inspection
Checking Pressure Signal From High Pressure Switch -G65-
The oscilloscope shows this display when the following conditions are met.
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Ignition switched on (B+ and Ground available at High Pressure Switch -G65-)
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Setting on oscilloscope:
5 V/Div. = (5V per unit DC voltage)
5 ms/Div. (5 Milli seconds per unit)
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Measuring lead (signal lead) connected to socket -7- of test box.
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Measuring lead (shielded wire) connected to socket -14- of test box (Ground (GND)).
NOTE:
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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)
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The impulse width -A- depends on the pressure in the refrigerant circuit (if pressure increases, area -A- is getting wider).
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The signal distance -B-is always 20 milli seconds (corresponds to frequency of 50 Hertz).
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The duty cycle is determined by the ratio of impulse width -A- and signal distance -B-.
Connector assignment at High Pressure Switch -G65-
Terminal 1: Ground (GND)
Terminal 2: Signal output (square wave signal to -E87-)