Stack Oil pressure sender

[GasMan]

Due to do Brands track day Tuesday 3rd May and My R500K series has oil pressure all over the place??

Cold start pressure no problem Set off gently and all well excellent oil pressure. 10 minutes into drive and oil temp and pressure in the normal range so start to press on. Oil pressure falls and warning light comes on then its normal then it falls bounces around like this till I get home. when it comes back its fine. I've checked all the usual things plenty of oil, and its new,checked the connections from the sender. I think the symptoms suggest the sender has failed. I have also had pressure -99 which according to stack trouble shooting suggests faulty connections or sender.

Anyone else had this? Suggestions please

Matthew

[PinotNoir]

Hi Matthew

I had an oil pressure display of '999’.  Similar to your diagnosis the troubleshooting section in the manual identified that there could be “an open circuit connection” (for the sensor) or possibly a faulty sensor. I checked the connections on the sensor which were good.

The pin connection at the Stack end was identified and using a tester  to check the cable to the sensor terminal this was found to be open circuit.  Tracing the cable back from the sensor there was an inline connector which had pulled taught and simply needed reinserting.  

I reviewed several electrical schematic drawings all of which omitted the inline connections, so it might be a simple one to check for.    

[GasMan]

Thanks PN will check pin connectors on the stack unit tomorrow. 

Matthew

[PinotNoir]

Reading the symptoms again if it recovering then an open circuit cable is unlikely, but a poor connection possible or of course a failing sensor.  If a poor connection this could be exhibited during movement particularly if there is any tension on a cable through steering etc.

If it helps the pin on the Stack MIL connector was 'D'.  This runs to pin 8 on the grey engine plug.  The other side of that ran to the OP sensor (yellow/red cable at sensor end).  If you can get to the MIL plug you should be able to check of the circuit through for continuity to the OP sensor.  If it is open circuit or a noticeable resistance that would be a likely cause.  Checking the schematic drawing I have (and some differ) the sensor also has a common connection to ECU plug 2 pins 73, 66 and 59 plus another connection to ECU plug 1 pin 6.  Loss or poor connection through any of these could also causes issues. I forgot to draw the extra inline connector on my schematic so can't be 100% sure which cable it was, so it's probably worth a look (it is not far from the sensor).  

Fingers crossed...