V8 Quattro V8-3562cc 3.6L DOHC (PT) (1990)
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A/C Signal: Description and Operation
A/C Request Signal
The ECM is signaled by the A/C relay whenever the A/C is turned on. The ECM 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.
PLAUSIBILITY CHECK
There is no self diagnosis or substitute signal for this input.
