IAC and Coil on Plug question - Toyota Nation Forum : Toyota Car and Truck Forums

T28miata · 10-06-2003, 10:17 PM

How does the IAC work? Is it a stepping motor that open according to a frequency? I need to know so I can see if an standalone will work on the V-6 engine.

Also can the Coils be fired dirreclty from the ecu output or does an igniter have to be used?

Anyone have anyput?

Nick · 10-06-2003, 10:52 PM

iac is controlled by the ecu

T28miata · 10-06-2003, 11:01 PM

of course it is, but I need to know how it's controlled does the ecu send it a frequecny that opens it or does the ecu send a voltage to open it and the opisite to close it?

Nick · 10-06-2003, 11:08 PM

pretty sure its voltage

T28miata · 10-06-2003, 11:51 PM

yep got it figured out, the ecu sends +12 volts to ISCO to open the valve (below the 750 idle rpm) or it sends +12 volts to ISCC to close the valve (if above 750 rpm) And im pretty sure the coils can be tirgger from the ecu.