HYBRID
Super Moderator <a href="http://www.toyotagtturbo.
Problem with DC is its always looking for a path back to earth. The ecu gives out a 5 volt positive signal to the sensor, but the 5 volts would not be read by the ecu interior components, until the components are connected to earth, creating a path.
So if the wire that is carrying the 5 volts back to the ecu gets shorted to earth, the 5 volts never gets to the ecu, it has got to earth at the short.
The IAT sensor is a big resistor, like the water temp sensor, its resistance decreases as temperature increases, if you disconnect it , it just thinks the air temp is high, so it does not adjust fuelling as much as it would if it thought the temp was low.
You can replace it with a fixed resistance for test purposes, I think its max resistance is 2k ohms.
i see.. so basically unless i get another sensor & compare notes i wont really know.. what do u think about the ecu not showing the check engine when the sensor is not clipped to the harness? surely if it works like the water temp sensor then when unpluged the ecu should show some kind of warning? its also listed in toyota's error codes..
one thing i noticed today was i have an old pivot earthing kit (seen better days) & one of the earths broke off.. since then i was getting readings of 13.6v max.. which isnt very good.. i fixed the lead & to my surprise the voltage on the battery increased to 14.0v car is working better, albeit its still leaning out..
iv asked keith to pass me on an apexi earthing kit he has, as i think its time to retire the pivot wireing.. i can run much more earths & will add 2 more places... an earth from the body to the plenum where the inejctor earth wire is.. & one as u suggested to the turbo.. as well as 6 other lines
how can i know when the iat sensor works john? should i just try a new one & see if it changes anything? or shall i have a look at the earthing from the ecu to the sensor? perhaps run new lines?
kon