A4 Quattro Sedan V6-3.0L (AVK) (2002)
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The A/C Control Head -E87- sends the request for increased coolant fan speed to the Engine Control Module (ECM) via the CAN-bus comfort
system:
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Vehicles with gas engines request 100% fan speed currently at approx.: 26 bar pressure in the refrigerant circuit.
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The signal generated from High Pressure Sensor -G65- is also used to control the engine. The A/C Control Head -E87- sends the information to
the Engine Control Module (ECM) via the CAN-bus comfort system (the necessary torque to drive the compressor depends on the pressure in the
refrigerant circuit). The signal is displayed as duty cycle in measuring value block depending on ECM version.
Test step 6:
Activation for A/C Compressor Regulator Valve -N280-
Test Step 6.1