Two questions actually...
There are two wires in the air intake temp sensor. One is Black/White tracer, the other is Green/Yellow tracer. Which one is the "ground" or better said what is the direction of electrical current flow? Also does anyone have the sensor signal perameters? I would like to know this before I go probing around and throw a code.

Joe

 

Year and model of bike? If I have your manual, I'll let ya know.

Mac

 

The 05 ultra should show B/W is the sensor ground and runs to the ECM. The circuit runs on 5 V furnished from the #7 terminal on the ECM.




TOYTECH

I have the sensor values for you, but can't get them to post here, send me a PM with your personal email and I will send them to you.

I can give you the sensor you need here, all the rest I need an email addy to send it to you. It's a chart.

3* F = 0.0 volts
104-140*F = 2.0-3.5 volts
248*F = 5.0 Volts

 

Thank you for the numbers. It's an 05 ultra. TC I knew you would have the info. I do not believe the sensor is bad but I do know if the ECU can be tricked into thinking the air inlet temp is colder than it really is the ECU will fatten up the fuel mix slightly. I do this with older Toyota's, BMW's and the like (OBD 1 not OBD 2). Tap in an adjustable potentiometer and dial in some resistance until you get the results desired. Just keep it below the treshold of throwing a fault code. Then build a "spigot" as it is called in the trade with the proper resistor and plug in between harness and sensor. The results are better throttle response and usually better fuel economy. I figure it is worth my time to fiddle and find out. will Post results if it works.

Joe

 

Yeah Joe, I'd like to know the results too. Wonder if you'll set a code? These things are pretty sensitive, it may end up effecting your IAC motor being the ECM thinks it is colder than it is and weird things to the idle. I sent you the chart, let me know if you get it .

If all alse fails, go with a TFI, it'll do the same thing for you.

 

TC,
I have the TFI. The air temp sensor is one of those gotta know kinda things before I do the TFI install.

Joe