Pwl Posted January 1, 2016 Share Posted January 1, 2016 Hi Guys, We have an 06 Reg Fiesta Ghia 1.6 TDCi with possible ECU fault. It's just had a new battery fitted. The car starts/runs fine for 10 mins or so then all electrical items start failing...power steering, abs light illuminates, heated screens stop working then eventually battery light comes on. If the engine is switched off, it will not restart due to no juice in the battery. I've got an ELM327 bluetooth code reader and it shows these faults..... P0620: Generator Control Circuit P1934: Unknown code - More information may be available on the web P0500: Vehicle Speed Sensor U0121: Unknown code - More information may be available on the web U0140: Unknown code - More information may be available on the web B1318: [Mitsubishi] Valve actuation. The car has been into Ford as it broke down one day. Please see the attached photo. I've had the ecu tested by a company but they were unable to find a fault, but also said they were unable to test it in "real time", as if it were fitted to the vehicle so couldn't rule out a software/processor fault. Has anyone any ideas what the cause could be? Grateful for any info. Thanks in advance. Quote Link to comment Share on other sites More sharing options...
Garryboy1888 Posted January 1, 2016 Share Posted January 1, 2016 Was the fault present before the battery was fitted. And what made you replace the battery. Have you had the alternator checked A low battery will usually throw those fault codes and illuminate the dash like a Christmas tree. I had a similar problem on my a4 TDI. Sometimes car wouldt start. Woul crank but not turn over. Eventually the battery would go flat trying to crank it and it would throw those fault codes and illuminate the ABS, airbags battery lights etc on the dash. When I hooked up my diagnostic I couldn't connect to ECU so I looked there and because water was getting in there was corrosion on the wiring. I rewired it and problem solved. Sent from my Nexus 5 using Tapatalk Quote Link to comment Share on other sites More sharing options...
iantt Posted January 1, 2016 Share Posted January 1, 2016 Sounds like the garage don't know what there doing, think you need to start again diagnosing from the beginning. So, now it's non starter, you need to charge battery up first. Then get a voltage check done at various points, do you have a charger and multimeter? 1 Quote Link to comment Share on other sites More sharing options...
thejeremyevans Posted January 1, 2016 Share Posted January 1, 2016 my first thoughts were the alternator or the battery. do the lights flicker when on full. have you fitted aftermarket Speakers or a boom box. check your connections on this. i don't know if they still use a part exchange on alternators these days. Quote Link to comment Share on other sites More sharing options...
stef123 Posted January 1, 2016 Share Posted January 1, 2016 What type of battery was fitted? Quote Link to comment Share on other sites More sharing options...
DieselPig Posted January 1, 2016 Share Posted January 1, 2016 Sounds like a bad earth somewhere, check all the heavy duty leads from battery to chassis and all the small ones where they bolt to the body. Take them off, clean and replace. Quote Link to comment Share on other sites More sharing options...
catmand00 Posted January 1, 2016 Share Posted January 1, 2016 Lead acid battery instead of the required calcium type will cause these issues. Sent from my SM-G920F using Tapatalk Quote Link to comment Share on other sites More sharing options...
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