Race Technology

I have the RT oil pressure sensor wired to the Dash2 as per the manual.

Red=5V, Black=Ground, White=Signal

On the Dash2 it reads 10bar (using the metric stock calibration) no matter what the engine is doing (or not doing).

If I use a meter, the white wire reads close to the same 5V reference voltage. Plugging that voltage into the equation gives a reading of about 10bar. So it must be a bad sensor or a bad cable.

As far as I can tell, there is no resistor in this cable as it is a 3 wire sensor. Getting at the sensor end to check the wiring will be quite a lot of work.

Any thoughts before I disassemble half my engine bay?

Thanks
Peter

Are you able to get to the sensor to just unplug the cable? If so you can do that and check the voltage reading then, just to check for a wiring fault rather than a sensor fault.

Martin

I will have to do that. It's a real pain. I did have bad wiring with another sensor - missing resistor.

I got to the sensor and checked the wiring. Wiring looked correct.

Taking readings with the car not running I get Vs=4.93 (using the 5V reference on the Dash2) and Vout=4.67. Doing the math I get about 10 bar so the Dash reading is correct.

Do I have a bad sensor then?

Bad sensor. The new one works perfectly.

Thanks