Club G40 Forum
Technical => Electrical => Topic started by: Craig g on November 12, 2012, 04:40:29 pm
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I've just finished my g40 conversion and the fuel pump just won't prime I've search high and low for a solution but no luck tried new pump relay the lot :(, how could I co about wiring a manual switch off the battery to the pump??
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Have you got the two pins near the coil the right way round? They look idential 3pin I think , was an issue that happed with mine.
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Well I have a 3 pin plug which has I think black brown and green wires going into it and this can either be plugged into the coil or there is another plug is can can into, I have it plugged into the coil, is this right?
I'm also using the part of the loom that plugs into the fuse box off the 1.0ltr I'm guessing this could be the problem?
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there's a 3 pin plug on the coil itself and one right next to it. One of the few plugs on the car that is actually possible to get the wrong way round. If they're wrong it wont start, try swapping them round.
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i had a similar problem, after some testing found out it was a poor earth.
Unsure to where the earth is for this but mine had a poor connection so added and extra earth under the seat on the lift pump
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Pretty sure I've got the 3 pin the right way around tried it bouth ways and nothing either way, spent a good amount of time cleaning all the earth but no luck,
starting to think that maybe my ecu is fried because I have no spark either?
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Just realised the relays don't click but everything will worked if there connected together manually ?
Also I think I may be missing a plug by the coil as I have one connection plugged into the coil and then a connector block on the side with nothing attached is this right or has some butcherd my loom at some point? I will take a picture tomorrow
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what reg is your car? and what abotu the donor as L reg have a different bay loom
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My car is an L reg spi and the donor car is either a J or a K can't remember which
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aha...
you'll have two coil like plugs by the coil - and you'll have a yellow plug near the heater on the L reg which was plugged into your old loom but isnt now?
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I have the 2 coil like plugs, but I only have a white plug spare near the heater has a white/yellow and a brown wire into it?
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In the hanyes wiring diagrams it shows a red/black wire from the ecu to the ignition switch for the g40 models but it doesn't show this for the spi models could this be my problem?
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that sounds like the throttle body connector that you have next to the heater. But it could also be the fog light loom connector,which is normally disconnected if you have no fog lights, it normally sits in the scuttle panel on the right hand side (as you look from the front).
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Search my username.... The plug issues i had are mentioned.
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Think its the fog light plug.
Yh I followed your thread polomon and did the same thing with the 3pin and 5pin connector but still no luck :(, everything will work I.e fuel pump and spark if I pinish the relay together by hand... Ignition switch maybe?
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It does sound like a problem with the ignition switch wiring.
The ECU relay powers up the ECU - it should be closed whenever the ignition is on. Take the relay out and check you get a voltage (12V) to the relay coil when the ignition is on (check Haynes manual for which contacts are the coil in the relay socket). The fuel pump relay coil is driven by the ECU - this will only go off at start up when it primes or if the hall sensor is sending a signal to the ECU as the engine rotates (the idea is the fuel pump will stop spraying high pressure fuel everywhere when the engine stops after you crash and the fuel lines are severed). If you get a spark then the ECU is powered OK (it is still possible for the fuel pump relay to not work if the drive transistor in the ECU is dead - best to only bridge the power switch part of the fuel pump relay socket when testing and avoid connecting any wires to the coil connections as the ECU could be damaged)
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Will check this tomorrow :),
Also whilst reading a thread from etches69 I reaad this “can you hear the relays click when the ignition is turned on? if not make sure you have a live ignition feed from the plug by the coil” well I have nothing connected to the plug by the coil :S I have the 3pin connector with black, green and brown wires that sits next to the coil, this has nothing connected to it? I also have a brown 2pin plug with red/black and black wires into it I guess this is what would be connected to the plug next to the coil if I was using the 1.0 loom, so which wires do I need to connect together from the 3 pin plug by the coil and the 2 pin plug?
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Will check this tomorrow :),
Also whilst reading a thread from etches69 I reaad this “can you hear the relays click when the ignition is turned on? if not make sure you have a live ignition feed from the plug by the coil” well I have nothing connected to the plug by the coil :S I have the 3pin connector with black, green and brown wires that sits next to the coil, this has nothing connected to it? I also have a brown 2pin plug with red/black and black wires into it I guess this is what would be connected to the plug next to the coil if I was using the 1.0 loom, so which wires do I need to connect together from the 3 pin plug by the coil and the 2 pin plug?
I had this covered in my topic mate :D
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Have you gt a link I followed the one about the wires in the scuttle tray (5pin connecter from the spi loom and the 3pin) but I can't seem to find anything about this plug next to the coil
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Think I may be close to sorting this, the ecu rely now clicks together however the fuel pump relay clicks on and off really fast making a buzzing noise??? :/
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http://www.polog40.co.uk/forum/index.php/topic,8746.msg61862.html#msg61862
That plug i had left i think is what you have next to your coil so you MAY need to splice like i did?
Clutching at straws, i dont remember my issues tbh.... lol sorry!
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This is the thread I've followed but its a different plug that I have by th coil, its a brown plug with 2 wires red/black and black, on the spi loom it would plug into a 2pin plug by the coil but now with the g loom the plug by the coil is a 3 pin black plug with black, green and brown wires so I've connected black to black, green to red/black and earthed brown the relays now click but the fuel pump one goes mental and clicks on and off rapidly intill you turn the ignition off :S
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Have you pulled the SPI engine loom completely out? half the brown plug is in the engine loom and the other half is on the car loom.
IIRC its the sidelight plug and the brown plug people get mixed up. make sure you havent plugged your brown into something else. My loom is inside so i cant reference you any ''real'' pics BUT.....
The below link takes you to a picture of my SPI loom plug, check the background of said pic and you'll see my brown plug.
Now said brown plug isent a straing fit iirc, i had to cut 1 plug off my G loom (irc) and fit the brown other half onto the wires.... I'll see if i can see what colours what under the dash later.
http://i134.photobucket.com/albums/q89/photo123_2007/Polo/IMG-20120721-00529.jpg
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SPI loom can be thinned down, iirc on that loom you need a couple of plugs, one being the plug that goes by the throttle body on the SPI, this plug:
(http://i134.photobucket.com/albums/q89/photo123_2007/Polo/IMG-20120818-00587.jpg)
On this plug there are a few wires you NEED:
2x oil pressure sensors (Blue with black tracer and yellow with black tracer)
Fuel pump lives (Red with yellow tracer)
White with yellow tracer is diagnostics plug, you can fuck that off for now, however i could wire mine in as the wires were there....
When i wired mine these threads REALLY helped me out also mate:
http://www.polog40.co.uk/forum/index.php/topic,211.0.html
http://www.polog40.co.uk/forum/index.php/topic,214.0.html
there was alo a thrwad by cheys03 which sods law i now cant find! i'll have another look....
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Not sure if it helps you out actually looking at it but this it the thread I thought was cheys03's
http://www.polog40.co.uk/forum/index.php/topic,6354.msg45662.html#msg45662
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Yh that brown plug is the one but I dnt have a clue what to wire it to? I have done the same with the 5pin plug
Really appreciate all the help btw :)
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Read my thread again mate :p this is the issue i had.... remember before you said you didnt have a black plug like the one i had? well i think that black plug goes to the brown..... have a read of my thread and the one posted by G40_AD its all there :D
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I can't find it anywhere in your thread (I'm probably being blind :S), I've done the same thing as you with the plug for fuel pump, oil sensors, diagnostic and the spare red/black.
I'm basically in the same situation as g40 ad's thread but the brown plug that's in his scuttle tray is down by my coil but there no solution on the thread and I can't find the one mentioned on club polo (doesn't help only being able to use my phone). I hate wires :( :L
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Well G40 ad's engine is now mine, tbh I was in the same situation as him.... Just looked under my dash and I have a brown plug labelled coil. The other half of said brown plug goes to that black plug ad sais what's this for if I remember correctly.... There's a green wire and a black wire in the G loom iiirc on a plug ythat reaches to the coil. My brown plug is soldered onto these two wires and then plugs into the other half of the wires. Green goes to red black tracer and black to black. Tother iirc on the 3 way is earth my memory is very vague on this as I did it a while ago and tbh I'm crap at wiring haha. Always good to know when I'm trying to help ay lol....
Work through wire by wire on the ecu pin out and find out which is which and see what you have left. I started with that and got as far as the issues I mentioned.
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Just tried this and still no spark or fuel pump I think it must be something to do with the power to the relays because If I put power straight to them then everything works, if anyone lives near shrewsbury and wants to help make another G live I'll happily pay you for your time
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I now have a spark and fuel pump not sure how I fixed them but they just started working :L, the only problem I have now is the injectors aren't firing anyone have any ideas on things to check?
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I think given everything is on this forum, and the only issues other than the usual are in my thread your on your own Craig.
They really arent hard to wire, im atrocious with wiring and bar issues that were out of my control i had no issues, check from each wire on the ecu using the FAQ section and find out which wire is which. start there, you either have a fuse issue or a wire not plugged in, so which is it? Do you even have a live to the ECU?
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Well I went out and got a multi meter and started checking the wiring, I do actually have power going to the injectors so the ecu must have a live but there's nothing going into the cylinders, there's fuel getting to the fuel rail, so I thought maybe the injectors themselves are at fault but what are the chances of all 4 failing? Well I had 2 sets with my conversion so I tried the second set but still nothing so what are the chances of 8 failing? What other factors could there be stopping them spraying?
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Do you have fuel to them? the pump may be priming but not pumping.... check each wire, 1 by one. find its purpose and then find the location of each wire in the car. laborious task but the only way anyone on the internet can advise without seeing it really. Its HIGHLY unlikey its 8 that have failed, more like no fuel pumping when cranked.
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The ECU injector driver is low-side drive - i.e. it's a switched ground, not a switched live.
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Check your hall sender, if you remove the distributor and rotate it by hand with the ignition on, the injectors should fire.
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Right I must be doing all your heads in with this :L but... I've solved the problem and created a new one.
There was a bad earth to the fuel pump relay so I've re connected the earth wire and the car now runs with very little issues apart from the exhaust blowing and it being slightly out of time I think, but now the fuel pump constantly runs on after turning the engine off???
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Swop your fuel pump ignition/prime live and permenant live over :-P god knows how this is happening, I've no idea sorry, sure someone that actually understands wiring will help hahah. If your exhaust is blowing it will sound tappy dude, especially if its manifold.
last stint now! Good luck, the wasted hours under the dash are all worth it trust me :-P