Ali786786 Posted July 23, 2016 Share Posted July 23, 2016 Hi, I've still got this fault on my Citroen Relay van 08 2,2hdi. (p0603, p0683, p0402) I've managed to find that there is no constant feed to the ecu on the 32 way grey plug but the earth is there. Connected a temp feed to it via the positive jump lead connection in the engine bay and cleared the fault codes. The engine light stayed out and didn't return. The funny thing is, the code that then appeared was p0685 (ignition to ecu short to positive). Can someone or Nick tell me if this is an issue from a relay in the fusebox or from somewhere else as i don't have a wiring diagram to see where this feed comes from. Thanks, Al Link to comment Share on other sites More sharing options...
euroserv Posted July 25, 2016 Share Posted July 25, 2016 Hello, The first thing to check would be the fuses on the battery positive terminal. There is a 'CAL5' fuse that is a large black device that can cause these problems if it has blown or has a very high resistance. Next up would be the blue connector under the fusebox. (AKA 'rusty junction'). After that it's a matter of checking thoroughly all wiring in the vicinity of the fusebox and this will involve removing the nearside headlamp. Also check that you have a good earth between the chassis and the gearbox mount. Regards Nick Link to comment Share on other sites More sharing options...
Ali786786 Posted July 26, 2016 Author Share Posted July 26, 2016 Hi Nick, Thanks fro getting back, I've checked all fuses and connections/connectors under fuse box and at the battery. Do you know if the pcm/ecu has a permant 12v from the battery or if its got a built in battery in the pcm? I've searched online for days trying to find an ecu pinout diagram to see which pin has 12v permanent and where it comes from. Al Link to comment Share on other sites More sharing options...
euroserv Posted July 27, 2016 Share Posted July 27, 2016 Hello, The ECU does not have a permanent live supply. It only gets a switched supply from the ignition through fuse 16 in the engine compartment. The memory for functions is non volatile and is stored in an EEPROM chip in the ECU. The wiring on a Citroen is pretty much the same as a Fiat and they suffer from a number of problems in the wiring loom. You often have to unwrap all of the bundles to find out where the problem is and it is normally a couple of wires rubbing together or a joint that has been stressed and the insulation cracks leading to oxidisation (green) of the copper wire and signal degradation followed by loss. It really is a matter of examining each and every wire! However, in your case i would be looking at the wires from the blue connector to the right hand connector on the ECU because it is most likely that your problem exists between pin 29 of the fuse box and pin 28 of the ECU. Nick Link to comment Share on other sites More sharing options...
Ali786786 Posted July 28, 2016 Author Share Posted July 28, 2016 Hi Nick, Thanks for getting back to me. DO you by any chance have a diagram so i can see the pins or do you have a coloured wire i can trace (assuming the wires are the same in all 3 variants of this van)?. Also, i did change the injector loom which had 2 connectors to the ecu (left and right hand side) the only one left was the middle connector on the ecu which i've had a multimeter set to continuity on but nothing obvious. Gonna rest for a couple of days to give my brain a rest and take a look again at the weekend. I know for a fact that the ecu is getting an ignition feed and earth is good as i've fitted a new earth strap and tried a jump lead from engine mount to chassis to no avail. Thanks for your help so far Nick. Al Link to comment Share on other sites More sharing options...
Ali786786 Posted August 4, 2016 Author Share Posted August 4, 2016 Update.... I've checked all wiring and still can't find out why the error codes keep coming back. I've spoken to Citroen with regards to a software update but they have told me it's upto date as it was done in 2012. I've heard conflicting stories of a few people who have take vans in for a reflash and i am tempted to try this at this stage cos i'm fed up now. Has anyone else had a similar experience where a ecu reflash has cured a fault? Al Link to comment Share on other sites More sharing options...
rolyk Posted August 4, 2016 Share Posted August 4, 2016 Several years ago I had the P0603 error and engine management light staying lit on my 2009 Boxer. Mine was also affected by bad starting from cold, particularly in the winter after standing for a while. I took Nick's advice and checked the wiring under the n/s headlight and cleaned all the loom plugs. I also ensured that the wiring in that area wasn't affected by water ingress and made sure that no water passed through the screen to scuttle joint, paying particular attention to sealing the extreme bottom nearside corner of the screen. I had previously installed drain pipes to the scuttle end trays. It's now fine, although I have had the occasional glitch which was cured by re-sealing the screen. My feeling is that it was either caused by the main ecu plug, which had small beads of what looked to be silicone, attached to the pins. Or, more likely, by water penetrating the wiring and plugs. It took a while to resolve and it had been into a Peugeot main dealer and a diesel specialist, both who failed to identify the problem, so I fully understand Al's frustration in getting it sorted. Link to comment Share on other sites More sharing options...
Ali786786 Posted August 4, 2016 Author Share Posted August 4, 2016 That's why i've been reluctant to take it into the garage which could take hours maybe days and still not be resolved and me left out of pocket. I've also had the beads of silicone which i've cleaned off, cleaned plugs, checked wires etc but still no joy. Apart from this issue, it's been fine since i've owned it from new. Just frustrated!! Al Link to comment Share on other sites More sharing options...
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