If a ST185 has an afm and ST205 has a boost sensor, why does my setup have both. My setup is off a ST185 and it has a boost sensor and afm, so how come, should it have only 1. Either one or the other. The boost sensor is also a MAP cos it senses whats in the intake manifold. Its only now i looked into this. Can anyone clarify this.
I can only assume its how the ECU interprets the readings that it requires two. So for whatever reason on gen1's and gen2's Toyo felt that the AFM was a better solution than a MAP sensor. I would also take a gander at that a boost sensor may not be exactly the same as a MAP sensor as well. I havent really played too much with the factory boost sensor to see the electrical difference in them.
The st185 uses the AFM for fuel metering, intake air temperature, and idle fuel correction. It uses the TURBO PRESSURE SENSOR only for operating the fuel cut system. The ST205 has no AFM. I uses speed density fuel metering. The MANIFOLD ABSOLUTE PRESSURE sensor, or TURBO PRESSURE SENSOR specific to the st205 is for doing fuel calculations along with the INTAKE AIR TEMPATURE, COOLANT TEMP and MANIFOLD AIR TEMPATUREsensors
