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with respect to the correctness of information in this document. Copyright by AUDI AG.
Note:
The pump for refrigerant run-out -V51 is only present in certain engine variations.
=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations
=> Relevant Workshop Manual Injection and Ignition system
11.4 - Check signal from high-pressure sensor -G65
-> A- Pressure on high-pressure side of refrigerant circuit in bar (overpressure)
B- Duty cycle of the square-wave signal
C- Curve
Notes:
◆ Control unit -J293 transmits a positive signal to operating and display unit -E87:
- When duty cycle is larger than 13% (equivalent to approx. 1.2 bar overpressure) and less than 78%
(equivalent to approx. 32 bar overpressure).
- If the duty cycle is less than 13% or greater than 78%, no positive signal is transmitted to -E87, and -E87
transmits no signal to -J293 - as a result -J293 does not switch on the compressor (via magnetic clutch
-N25).
◆ If the refrigerant circuit pressure was greater than 32 bar (duty cycle greater than 78%), control unit -J293
does not re-transmits a positive signal to -E87 until the pressure drops below 24 bar (duty cycle less than
65%).
Audi A3 1997 ➤
Heating, Air Conditioner - Edition 06.2000
11.3 - Electrical check at control unit -J293 (version for High-pressure sensor -G65) 85
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