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Car Forum / Fiat Cars / May 2006Punto Mk1 Weird Electrics
A strange thing seems to be happening I had the punto Mk1 sitting on the drive for over a week without starting it and when I went to start it the ignition light and injector light on the dash were very faint and I tried turning over the engine but the engine clicked and that was about it. I then tried jump leads from a battery I have had on charge the last couple of days and that didn't turn over the engine. So I decided to hook up the jump leads to my other car and I ran the car for a while then went into the punto turned the key but no red lights came on the dash at all but the Speedo shot up to 40mph for some reason and the fuel gauge moved but no click or a sound from the engine, it wont even try to turn over. At the moment I have checked all fuses including those in the engine compartment and they are OK. So at the moment all I get on the dash is no lights but the Speedo shoots up to 40mph. Thinking of nothing else to do I am thinking maybe the electrics have malfunctioned or the ECU is a bit confused so I have disconnected earth on the car battery and hoping this might reset things? - do I leave the battery disconnected overnight or would 10 minutes or something do it? > So I decided to hook up the jump leads > to my other car and I ran the car for a while then went into the punto > turned the key but no red lights came on the dash at all but the Speedo shot > up to 40mph for some reason and the fuel gauge moved but no click or a > sound from the engine, it wont even try to turn over. You need a lead with a 12V low wattage bulb on the end to trace voltages, or a test screwdriver with a flying lead and clip, the clip you clip onto a good earthing point, engine block or chassis. Start across the battery, then pull the small push on connector on the starter, poke the screwdriver tip in to make contact, and get someone (with the car out of gear, and the handbrake on) to turn the ign. switch to the Start position. Does the lamp light? If so push the blade back on, and try starting again. If 12V isn't getting to the starter blade in the Start position it isn't going to crank. It may be the battery is totally flat, or knackered, so remove it, put it on the charger until all cells gas freely. Don't use a naked flame to check, you get sprayed with acid if the battery explodes. Any anti-theft circuits involved? Thank you for your advice. Amazingly all it must have been that the Battery was so flat it caused these weird goings on - yes I would expect the engine not to turn over with a flat battery but as for all this weird goings on with the instrument gauge and warning lights on the dash is very strange! Anyway I gave the battery a good overnight charge and fitted it back on and all seems to be working as it should. Thanks again, I was beginning to think it was going to be a weird electrical or ECU fault instead of just a flat battery! ---------------------------------------------------------------------------------------------------------------------------------------------- >> So I decided to hook up the jump leads >> to my other car and I ran the car for a while then went into the punto [quoted text clipped - 16 lines] > flame to check, you get sprayed with acid if the battery explodes. > Any anti-theft circuits involved? > Thank you for your advice. Amazingly all it must have been that the > Battery [quoted text clipped - 10 lines] > electrical > or ECU fault instead of just a flat battery! You can also get odd faults with high resistance between the battery and the battery leads, or a bad earth somewhere. It just means cleaning all joints until you find the bad ones! Sometimes a high current will make them get hot, especially while trying to start the engine. I had a dodgy connection in that big plug on the ecu with mine and it took ages to find, as it was intermitent and nearly drove me nuts. Italian electrics? Getting better but still a favourite area for problems. David. |
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