TT Quattro Roadster L4-1.8L Turbo (AMU) (2002)
High Pressure Sensor / Switch: Testing and Inspection
High Pressure Sensor -G65-, Checking Signal
High Pressure Sensor -G65-, Checking Signal
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Connect oscilloscope test leads to -G65- signal wire refer to electrical testing, step 4. See: Engine, Cooling and Exhaust/Cooling System/Radiator
Cooling Fan/Radiator Cooling Fan Control Module/Testing and Inspection/Vehicles With High Pressure Sensor - G65 -
The oscilloscope shows this signal pattern under the following conditions:
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Ignition switched on (-G65- connected to positive and GND).
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Oscilloscope settings: 2 V/Div. = (2 volts per grid division, direct current) 5 ms/Div. (5 milliseconds per grid division).
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Oscilloscope test lead (signal wire) connected to terminal 2 on -G65-.
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Oscilloscope test lead (shielding) connected to GND.
NOTE:
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Signal pattern illustrated corresponds to a refrigerant system pressure of approx. 5 bar (equivalent to a signal ratio of approx. 20%). This is the
pattern that occurs at an ambient temperature of 20 °C (68 °F) when the compressor is not running and the refrigerant circuit is full.
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Pulse width -A- varies according to refrigerant system pressure. When the pressure rises, the pulse width increases.
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Interval -B- between signals is always 20 milliseconds.
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The signal ratio is the ratio between pulse width -A- and signal interval -B-.