Wiring In My Map And Throttle Pos Sensors

[allanallen 528 2 Cars]

does anyone know how to test which wires which on map sensors and tps.

 

i have a magnetti marreli 250kpa (escort cosworth) map sensor, cant remember what make the the tps is but it has 3 wires like most.

 

cheers, al

[allanallen 528 2 Cars]

right i'm thinking on the map sensor

 

pin 1, earth

pin 2, signal/output

pin3, +5v

 

can anyone confirm this??

 

still no idea how to test whats what on the tps though

Edited July 31, 2008 by allanallen

[petert 549]

Measure the resistance with a multimeter. It's just like a potentiometer, the signal being the wiper (resistance varies with vacuum). The resistance between GND and +5V will be fixed. Hook it up to a car and see what you get!

[Tom Fenton 1,524]

For the MAP sensor, if it is the same as the one that Emerald supply, which I think it is,

 

Pin 1 = Signal output to ECU

Pin 2 = Sensor Earth (send to common sensor earth point to make sure you don't get interferance)

Pin 3 = Sensor +5V supply from ECU

 

For the TPS, do as Peter suggests. On the Emerald it doesn't matter which way around you wire the 0v and 5v, as all the ECU is looking for is the change, and you then calibrate the TPS before you start doing anything in the ECU.

If its a Bosch TPS then the outer two pins (e.g. pins 1 and 3) are 0v and 5v, and then the middle pin (e.g. pin 2) is the signal that changes with angle of the TPS.

[allanallen 528 2 Cars]

cheers chaps, I'm guessing if i wire these up wrong they'll simply not work rather than f***ing anything anyway??