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Pin assignment on the high-pressure sender G65 > < Test step 5:

A2

Checking the pressure signal from the high-pressure senderG65
Checking the pressure signal from the high-pressure sender -G65-
   
This display appears on the oscilloscope screen if the following conditions have been satisfied.
–  Ignition switched on (positive and earth applied to the high-pressure sender -G65-)
–  Oscilloscope settings: 5 V/div. = (5 V per unit DC voltage) 5 ms/div. (5 milliseconds per unit)
–  Test lead (signal lead) connected to socket -7- on the test box.
–  Test lead (screening) connected to socket -14- on the test box (earth).
  Note
t  The illustration shows the signal transmitted at a refrigerant circuit pressure of approx. 7 bar absolute, corresponding to a signal ratio of approx. 25 % (level occurring with the compressor not running, at an ambient temperature of 30 °C and with the refrigerant circuit charged).
  A87-0375
t  The pulse width -A- is governed by the pressure in the refrigerant circuit (area -A- becomes broader as the pressure increases).
t  The signal interval -B- is always 20 milliseconds (corresponding to a frequency of 50 Hertz).
t  The signal ratio is derived from the ratio of pulse width -A- to signal interval -B-.
  A87-0375

Pin assignment on the high-pressure sender G65 > < Test step 5: