100 Wagon L5-2309cc 2.3L SOHC (NF) (1989)
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.