200 Quattro Wagon A/C Signal Description and Operation
A/C Signal: Description and Operation
The ECU is signaled whenever the A/C is turned on. The ECU then responds by modifying the duty cycle to the idle stabilizer valve, increasing the
idle speed by approximately 100 rpm. This is to ensure a smooth idle with the additional load of the A/C compressor, as well as to ensure more efficient
A/C operation when the engine is idling.