90 Quattro 20V (Canada) L5-2309cc 2.3L DOHC (7A) (1989)
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A/C Signal: Description and Operation
The ECU is signaled by the A/C relay 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.
SELF DIAGNOSIS
There is no self diagnosis or substitute signal for this input.
