AdamQ Posted August 2, 2019 Share Posted August 2, 2019 On a standard R400D with MBE ECU, can anybody tell me whether or not the ECU controls the fuel pump?If so, how? Which pin on the ECU and does it switch to earth to activate a relay or whatever?I'm trying to go from MBE to Emerald and I don't seem to have any activity from the fuel pump ...TIA,Adam Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted August 2, 2019 Member Share Posted August 2, 2019 Have you got the factory wiring diagram already? Let me know if not and you'd like a copy.Jonathan Link to comment Share on other sites More sharing options...
David_Long Posted August 2, 2019 Share Posted August 2, 2019 Yes it is. Not sure what pin but I think it is one of the programmable ones. It is complicated somewhat by the immobiliser also interrupting the pump (with little information in the wiring diagram) and of course the inertia switch. Link to comment Share on other sites More sharing options...
AdamQ Posted August 2, 2019 Author Share Posted August 2, 2019 I've got the file 'AssemblyGuide 05.2012.pdf' which I think came from you some years ago.That's got what appear to be loom manufacturing diagrams as opposed to legible wiring diagrams and I can see no mention of the fuel pump beyond the inertia switch ...Adam Link to comment Share on other sites More sharing options...
AdamQ Posted August 2, 2019 Author Share Posted August 2, 2019 Thanks David. I'll trawl the SBD website and elsewhere ... Link to comment Share on other sites More sharing options...
David_Long Posted August 2, 2019 Share Posted August 2, 2019 Pin 17 Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted August 2, 2019 Member Share Posted August 2, 2019 You should have this bit on page 219:From that you can trace the connections upstream by using the wire number. In theory.Jonathan Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted August 2, 2019 Member Share Posted August 2, 2019 What do SBD call that ECU?Jonathan Link to comment Share on other sites More sharing options...
AdamQ Posted August 2, 2019 Author Share Posted August 2, 2019 Superb - thanks David.Jonathan, I do indeed - should have looked harder. Yes, it's the 'in theory' bit that stymies me. Link to comment Share on other sites More sharing options...
SKC Posted August 2, 2019 Share Posted August 2, 2019 Hi Adam,What is the reason from switching from MBE to Emerald?Does the Emerald offer more functionality?RegardsSKC Link to comment Share on other sites More sharing options...
mic Posted August 2, 2019 Share Posted August 2, 2019 Depends how old the car is, newer cars use a different pump and module. Link to comment Share on other sites More sharing options...
AdamQ Posted August 2, 2019 Author Share Posted August 2, 2019 Jonathan, I think it's the 9A4.SKC, it's a long story - I'll PM you.Mic, the car left the factory in late 2015.Many thanks to all for the help.Adam Link to comment Share on other sites More sharing options...
aerobod - near CYYC Posted August 2, 2019 Share Posted August 2, 2019 If it is the engine with the plenum and not roller barrels, the 9A4 ECU will have a 30L279A number on it. For older cars it will be the 992 ECU with 30L153A on it. Pinouts and connectors should be the same for both, though.Using the R400D wiring diagram, the fuel pump is controlled by programmable Pin 17 on the ECU, the wiring path is then as follows:BO (Black/Orange) Wires: Pin 17 - BO39 - Wire connector (BO39/BO40/BO41) Wire connector - BO41 - MFU 6-pin connectorYG (Yellow/Green) Wires: MFU 8-pin connector - YG61 - Chassis loom connector Chassis loom connector - YG166 - Fuse block fuel pump relay Fuse block fuel pump relay - YG167 - Inertia switch Inertia switch - YG168 - Fuel Pump Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted August 2, 2019 Member Share Posted August 2, 2019 Thanks x2.Jonathan Link to comment Share on other sites More sharing options...
mic Posted August 2, 2019 Share Posted August 2, 2019 aerobod, not sure what diagram you're using but there is not an MFU on the R400D Link to comment Share on other sites More sharing options...
aerobod - near CYYC Posted August 2, 2019 Share Posted August 2, 2019 It is the term Caterham uses for the board behind the buttons on my 2012 R400D, not the same as the MFU on the earlier K-series R400s.From the 2012 Assembly Guide P219, R400 electrical diagram: Link to comment Share on other sites More sharing options...
mic Posted August 2, 2019 Share Posted August 2, 2019 OK, Link to comment Share on other sites More sharing options...
AdamQ Posted August 2, 2019 Author Share Posted August 2, 2019 Superb - thank you all - greatly appreciated.Adam Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted August 3, 2019 Member Share Posted August 3, 2019 How's it going?It is complicated somewhat by the immobiliser also interrupting the pump (with little information in the wiring diagram)...Is that definitely the case for both of those ECUs?Andrew discovered that it didn't in one of his experiments on Ks.ThanksJonathan Link to comment Share on other sites More sharing options...
vertew Posted August 3, 2019 Share Posted August 3, 2019 For ref, here's a pdf of what I've pieced together, while fault finding - this traces the electrics back from the fuel pump to the ECU, via immobiliser and MFRU, showing pins & connectors. Link to comment Share on other sites More sharing options...
AdamQ Posted August 4, 2019 Author Share Posted August 4, 2019 Further thanks for all the additional information on this - much appreciated.Out of interest and for completeness, if anybody knows what the other programmable pins on the ECU are used for (pins 25, 27, 33 and 34), it might be handy to others to have it recorded somewhere (I acknowledge that theoretically it's there in the 'wiring diagram', but ...). Link to comment Share on other sites More sharing options...
vertew Posted August 5, 2019 Share Posted August 5, 2019 Hi Adam - Revilla's wiring diagram (stunning piece of work) sets out a legend for ECU plug connections on K Series EU3. I've found these diagrams useful for my Duratec / CSR, though I've not needed to do diagnostics on ECU pins. So, may be useful, but treat with caution ... regs, Andrew. Link to comment Share on other sites More sharing options...
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