Precis L4-1468cc 1.5L SOHC (1993)
A/C Compressor Controls W/MPI
OPERATION
When the driver turns on the A/C system, a positive voltage signal is supplied to the ECU (as an indication that the A/C system is needed) and to
one side of the A/C relay coil.
The ECU determines if engine conditions are suitable for A/C operation (idle speed, ignition timing and air/fuel mixture). If the ECU senses that
conditions are suitable for A/C operation, it supplies the ground circuit for the A/C relay coil, energizing it. This allows the relay to supply voltage
to the compressor clutch.