evotell Posted May 4, 2012 Share Posted May 4, 2012 We have an issue with the oil pressure gauge in our new R400. We have changed the sender unit, changed the gauge. We have spent 8 hours today doing the following: Unwrapped dash loom from beneath the scuttle. Taken all pins/sockets out of plugs, checked and reinstalled. Checked continuity on all wires, plugs etc. for oil pressure gauge We have continuity on the green/orange wire to sender from the chassis/engine harness plug. This wire changes colour at this plug to green/white to the gauge. ie: Continuity from gauge plug to sender plug We have a ground/continuity on BOTH sending units if checked between green/orange & black when disconnected from loom. Is this correct or are both sending units faulty? Would this not tell the gauge to go full reading? We have continuity with ignition OFF between green/white & white/brown at the chassis/engine plug with ECU connected NO continuity with ECU unplugged How/why is the ECU in the gauge circuit? Is there a bad/high resistance ground somewhere? Where are the main grounding points on the chassis? HELP ☹️ Link to comment Share on other sites More sharing options...
mic Posted May 4, 2012 Share Posted May 4, 2012 Is this a Duratec engine with an MBE ecu, if so ECU may be linked so the pressure can be logged. Link to comment Share on other sites More sharing options...
evotell Posted May 4, 2012 Author Share Posted May 4, 2012 Not sure will check this morning, thanks Link to comment Share on other sites More sharing options...
evotell Posted May 14, 2012 Author Share Posted May 14, 2012 Oil pressure update. We have changed the gauge, the sender, the dash sub loom, the ECU and the oil pressure gauge is still not working. We also have a flickering rev counter. ☹️ Link to comment Share on other sites More sharing options...
Stationary M25 Traveller Posted May 14, 2012 Share Posted May 14, 2012 Sounds like a poor earth (ground) connection ? Link to comment Share on other sites More sharing options...
charlie_pank Posted May 14, 2012 Share Posted May 14, 2012 If you've got other random symptoms (ie flickering rev counter) then you've either got a bad earth connection, or something is earthing where it shouldn't. Link to comment Share on other sites More sharing options...
evotell Posted May 31, 2012 Author Share Posted May 31, 2012 Finally sorted it out. The rev counter didn't work because the factory hadn't programed the ECU correctly, it was only sending out 1 pulse for the rev counter instead of 4 pulses. The oil pressure has been resolved by the factory sending us a separate loom for the oil pressure, a new gauge and a new sender. What a pain in the backside this has been. Link to comment Share on other sites More sharing options...
charlie_pank Posted May 31, 2012 Share Posted May 31, 2012 But you said you swapped the ECU out to test it and still had a flickering rev counter? Link to comment Share on other sites More sharing options...
evotell Posted May 31, 2012 Author Share Posted May 31, 2012 We had swapped it out, what we discovered is that Caterham had a batch of R400 ECU's that had all been programed incorrectly, so we just kept getting the same problem. Link to comment Share on other sites More sharing options...
charlie_pank Posted May 31, 2012 Share Posted May 31, 2012 Aaaah I see. Do you know what was wrong with the oil pressure system? Link to comment Share on other sites More sharing options...
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