10 bar oil pressure with engine off

Peter Carroll/Toronto
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Joined: Wed Jul 04, 2007 11:33 pm
Location: Toronto, Canada
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10 bar oil pressure with engine off

Postby Peter Carroll/Toronto » Sat Jul 05, 2008 2:29 am

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

Support

Postby Support » Mon Jul 07, 2008 7:59 am

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

Peter Carroll/Toronto
Posts: 110
Joined: Wed Jul 04, 2007 11:33 pm
Location: Toronto, Canada
Contact:

Postby Peter Carroll/Toronto » Mon Jul 07, 2008 3:08 pm

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

Peter Carroll/Toronto
Posts: 110
Joined: Wed Jul 04, 2007 11:33 pm
Location: Toronto, Canada
Contact:

Postby Peter Carroll/Toronto » Mon Jul 07, 2008 7:04 pm

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?

Peter Carroll/Toronto
Posts: 110
Joined: Wed Jul 04, 2007 11:33 pm
Location: Toronto, Canada
Contact:

Postby Peter Carroll/Toronto » Sat Aug 30, 2008 2:41 pm

Bad sensor. The new one works perfectly.

Thanks


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