Tomandrew10 Posted June 19 Report Share Posted June 19 Hi, I’ve got an issue with my Gti it cranks over and tries to start but cuts out sometimes it just keeps cranking but doesn’t fire. The fuel pump seems to pressurise sometimes when the ignition is put on but other times it doesn’t. Checked spark and all ok. Battery voltage is 11.7. Checked fuse for fuel pump and that’s ok. The car has been stood for a week or so. Does anyone know what might be causing this? Thanks 1 Quote Link to comment Share on other sites More sharing options...
sj2112 Posted June 19 Report Share Posted June 19 Have you tried putting a jump pack/trickle charger on the battery? 2 Quote Link to comment Share on other sites More sharing options...
lupogtiboy Posted June 20 Report Share Posted June 20 Have you put a scanner on it? My bet would be the crankshaft sensor, utter b@stard to change 1 Quote Link to comment Share on other sites More sharing options...
mk2 Posted June 20 Report Share Posted June 20 Can you smell any fuel at the exhaust? If not, could be fuel system related, like pump, filter, pressure regulator, that sort of thing. Not ECU. Not temp sensor. Not ignition or plugs. And like @lupogtiboy says, crank sensor? You'll get no or intermittant sparks if it's the crank sensor. 1 Quote Link to comment Share on other sites More sharing options...
Tomandrew10 Posted June 20 Author Report Share Posted June 20 Had a carly code reader on it and didnt get much back, so borrowed a Vagcom lead and read the codes on that. Come up with low voltage to ECU is preventing start. Going to charge the battery up and have another go over the weekend. Didnt think it would be battery related as it turned over no problem! Yeah spark seemed fine so hoping the cranks sensor is ok. Thanks for the replies! Quote Link to comment Share on other sites More sharing options...
mk2 Posted June 20 Report Share Posted June 20 You won't get a code for crank sensor... Fuel problem then? Quote Link to comment Share on other sites More sharing options...
Tomandrew10 Posted June 22 Author Report Share Posted June 22 Been trying to get it started over the weekend with no luck. Tried charging the battery and checked all fuses but can’t find any issues. Getting 1 fault code which is p1570 Engine start blocked by immobilizer. I have also found on VCDS in the immo measuring blocks all numbers are 0 except 2 keys adapted and immo status 6. I’m going to check relay 109 and if that’s ok look at the immo itself but not sure what to do after that. Anyone got any ideas? thanks Quote Link to comment Share on other sites More sharing options...
mk2 Posted June 22 Report Share Posted June 22 Yeah, the immobiliser... There's a pick-up coil around the ignition key barrel. You could very carefully, remove the chip from your only working key and tape it to the pick-up ring. But you might already be getting a key symbol on the dash? Not sure if your version of GTi has it. Quote Link to comment Share on other sites More sharing options...
Tomandrew10 Posted June 22 Author Report Share Posted June 22 I’m thinking it’s more a power issue than a key issue, because if it was a key issue would there not be some response from the ecu to the immobiliser? I'm also struggling to find relay 109, I’m not sure if it has been replaced with a relay with a different number on it. There is a 95 which I’m not sure about all the others seem pretty normal. Do the positions of the relays vary from car to car? Thanks Quote Link to comment Share on other sites More sharing options...
mk2 Posted June 23 Report Share Posted June 23 You already have the immobiliser response code... it's the ECU that's given that code above, not the immob? Positions are the same, so you might be right. Might have been changed before? @lupogtiboy, do you have a relay position diagram? I can't find one for the Gti. 1 Quote Link to comment Share on other sites More sharing options...
Rich Posted June 23 Report Share Posted June 23 Does a GTi have 109? Location? 1 Quote Link to comment Share on other sites More sharing options...
lupogtiboy Posted June 23 Report Share Posted June 23 2 Quote Link to comment Share on other sites More sharing options...
Tomandrew10 Posted June 23 Author Report Share Posted June 23 That really helpful thanks!! I’ve seen some stuff saying p1570 is a hard code and is difficult to get rid of does anyone know anything about this? Originally there was a code about low voltage which went after the battery was charged so wondering if it just needs hard clearing. I’ve cleared the code on vcds but it just comes straight back so I’m wondering if it isn’t fully clearing it? Thanks Quote Link to comment Share on other sites More sharing options...
Tomandrew10 Posted June 23 Author Report Share Posted June 23 These are the codes that are coming up. Quote Link to comment Share on other sites More sharing options...
lupogtiboy Posted June 24 Report Share Posted June 24 Ross Tech Wiki shows this 17978/P1570/005488 - Ross-Tech Wiki and this for the other fault 18010/P1602/005634 - Ross-Tech Wiki 2 Quote Link to comment Share on other sites More sharing options...
Tomandrew10 Posted July 5 Author Report Share Posted July 5 Finally got chance to have another look today and decided to check the immobiliser, got it out and took the plastic covers off and there is a lot of corrosion on the board. There are multiple breaks in the tracks on the board which have been fixed but there may still be more which I haven’t found yet. I have tried putting the immobiliser back in but it still won’t start, I am wondering if the immobiliser needs resetting somehow to remove the block on the engine starting. Does anyone know if this may be the case? Also does anyone know if it’s possible to replace the immobiliser? Thanks Quote Link to comment Share on other sites More sharing options...
Rich Posted Thursday at 02:47 PM Report Share Posted Thursday at 02:47 PM Location? Quote Link to comment Share on other sites More sharing options...
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