Oil Pressure warning light and buzzzzzzzzer on Campaign

Hi,


If anyone can help me I will be eternally greatful. I think this might be a common problem but no one Ive been to seems to know how to fix it and Im throwing alot of money away on things that dont actaully need repairing in trial and error. The oil pressure warning lamp and alarm buzzer are constantly on, every time the engine is turned on. I have replaced all 3 oil pressure switches, had an oil change, oil filter, new thermostat and no results. I took it to an electrical place who though it was the oil pressure conrol unit, but apparently you cant get these anymore. Does this sound right to anyone who might have had this problem before? Oh yeah, I can get the alarm to turn off when I put the headlights on so it obviously is something electrical.

It's a 83 Campaign which will be up for sale once this problem is fixed.

Thanks, Tom

The controller for this is an L shaped circuit board in the speedo - actually in the speedo itself.

I see that you have had some work done but did not see - tested oil pressure??

There should be two oil pressure switches - these often get mixed up and installed the wrong way round and with the wrong ones.

On the end of the head is a high pressure switch - normally open 1.8 bar
On the oil filter housing is the low pressure switch - normally closed 0.3 bar

To test the clocks - connect the head switch to earth and disconnect the lower one - rev engine over 2000rpm - buzzer and light should go out if clocks are working correctly.

Testing engine oil pressure - test at the head and at the filter housing - you should have 28psi or higher with hot engine at 2000rpm

The sensor looks at the low pressure switch below 2000 rpm and at the high pressure over 2000rpm, so at idle you'd expect to have over 0.3 bar - just less than 5psi

Hope this helps - if needed we may have a controller board.

Other things that can case problems are broken wires/bad connections - cracked/damaged circuit board on the back of the clocks.

Cheers

Rich

Hey Rich,

thanks for the reply, sorry some of that is over my head but I'm pretty sure one of the garages did an oil pressure test as they said the oil pressure was fine. How much do you sell the controller boards for? Cheers

Tom

Hi, I had this for ages. Just connect the wiring  that goes to the sender on the side of the block to the battery +ve. That should stop it, but you'll need to fit another form of low pressure warning like vdo gauge.