Originally Posted by
Chip
I wouldnt put 5v in it straight away, I would just use a resistance meter to measure the resistance between the pins, I would imagine from that alone you would be pretty confident which was which.
5v is unlikely to blow anything, but I still wouldnt risk it on a part with any value.
FYI....
You
cannot use a resistance meter to check/test a map sensor in any way !
5 volts is perfectly capable of blowing up the map sensor if its connected up wrong as most ECU's will provide several amps @ 5 volts which is enough to start a small fire..LOL
If I was investigating an unknown sensor like this, I would test the sensor using a volt meter on the output.
Supply the 5 volts power through a 1K resistor temporarily as then if you do connect it up wrong, the current drawn will be limited and should not damage the sensor.