MAP wiring : which wire is signal

[yanlapanic]

Hi , I would like to know which one is the signal wire that go to the ECU .


a: brown
b: green/red
C: yellow

Thanks
picture added : http://img411.imageshack.us/f/1000526r.jpg/

[fishexpo101]

I've looked over some specs that I have for Toyota MAP sensors, but wiring colors doesn't line up. I'd suggest taking a high impedance voltmeter and probing the connection side. Should be able to find which one is ground and which one has a constant voltage (source voltage). The leftover connection is the pressure signal to ECM - you can verify this with a change in pressure (changes in pressure changes the voltage output of the powered sensor).

[yanlapanic]

Originally Posted by fishexpo101

I've looked over some specs that I have for Toyota MAP sensors, but wiring colors doesn't line up. I'd suggest taking a high impedance voltmeter and probing the connection side. Should be able to find which one is ground and which one has a constant voltage (source voltage). The leftover connection is the pressure signal to ECM - you can verify this with a change in pressure (changes in pressure changes the voltage output of the powered sensor).

Ok but that sad cause i dont have HIGh impedance voltmeter. only standard one

[yanlapanic]

maybe someone have the answer , i'll wait a little bit ..

[Buurin]

Brown is ground.
Yellow is (I believe) voltage supplied by ECU to run the sensors.
Light Green/red is the MAP signal to ECU.

Now thank me.

[yanlapanic]

Originally Posted by Buurin

Brown is ground.
Yellow is (I believe) voltage supplied by ECU to run the sensors.
Light Green/red is the MAP signal to ECU.

Now thank me.

THanks a lot for info ! , I'll try it