For those who think: TL;DR long story short: I want to measure the voltage output at certain temperature but do not get a signal.
I have a BOSCH MAP Sensor here (0281006108), it has 4 Pins:
I am not sure if the sensor delivers correct data and I am by nature a person interested in details so I wanted to compare it to a new sensor. As I cannot do this in a controlled test in a car I decided to make my own test setup.
I wired the sensor according to spec and used an Arduino to record the data. On the pressure line (4) I get information and it does change if I change the pressure but on the temperature I get NOTHING!
I suspected the arduino so I used a 5Volt external Power Supply but again Nothing with a multimeter. Then I went back into the car and plugged the sensor back in place, added some more wires in between the plug and the sensor and voila, the car did the trick. But this doesn't help me.
So why on earth does it not work in my test setup but in the car? From what I know 0281006108 is an analogue sensor and the ECU doesn't send any data to the sensor.
Any help appreciated.