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Technical MIL engine light on but no codes please help Scudo 1.9D 2004

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Technical MIL engine light on but no codes please help Scudo 1.9D 2004

Hi Robert, thanks for getting back to me. I also took a break from the van and did some diy. I'm attempting to build my own CNC router from scratch and some how its easier than trying to get a light bulb to go out :bang:.

So all the results a I gave you were with the Red DMM lead to ground. I assumed this must be the right way around as i assumed there was a diode somewhere because when the black lead is connected to ground and the red lead used to probe the wire disconnected from the cluster I only get very very high resistances for both ecu connected and disconnected configurations. Would this fact change you estimate of the conclusions? Perhaps i'm probing the wrong place. I realised that there were some difference between the wiring diagram you sent and my setup. Wire 480 actually went to pin 7 (not 14 as i said before and shown in the schematic) but this is definitely the wire that links to the MIL light circuit (and this numbering is consistent with another wiring diagram). The path on the PCB on the other side of MIL bulb links to a number of other bulbs so presumably this is the live feed and the side i disconnected (and was probing on) was the ground switch side.

If this doesn't change the conclusions then i think i'll be ordering an ECU tomorrow as it's the least i can do for the old girl. Even if it doesn't work at least I wont spend my days wondering what if.

thanks

Kieran
 
kmonk said:
Hi Robert, thanks for getting back to me. I also took a break from the van and did some diy. I'm attempting to build my own CNC router from scratch and some how its easier than trying to get a light bulb to go out :bang:.

So all the results a I gave you were with the Red DMM lead to ground. I assumed this must be the right way around as i assumed there was a diode somewhere because when the black lead is connected to ground and the red lead used to probe the wire disconnected from the cluster I only get very very high resistances for both ecu connected and disconnected configurations. Would this fact change you estimate of the conclusions? Perhaps i'm probing the wrong place. I realised that there were some difference between the wiring diagram you sent and my setup. Wire 480 actually went to pin 7 (not 14 as i said before and shown in the schematic) but this is definitely the wire that links to the MIL light circuit (and this numbering is consistent with another wiring diagram). The path on the PCB on the other side of MIL bulb links to a number of other bulbs so presumably this is the live feed and the side i disconnected (and was probing on) was the ground switch side.

If this doesn't change the conclusions then i think i'll be ordering an ECU tomorrow as it's the least i can do for the old girl. Even if it doesn't work at least I wont spend my days wondering what if.

thanks

Kieran
Click to expand...
Hi,
The 650 "ohms" you are seeing with red lead to chassis is actually the 650mV forward voltage of a protection diode in the ECU. You clearly don't have a short in the loom or cluster so I'd stick by 90% certanty that the ECU is faulty. The only way to be more certin would be to bench test the ECU or replace it. Replacing seems to be the easy option.



I'm not doing anything as interesting as a CNC router, just a large custom cupboard door. Cupbord is 6ft off the ground just to make it intreresting. Used to design XYZ positioning systems as a day job. up to 1.2 x.0.8m X and Y with one micron resolution and 3 meters pers second velocity.



Robert G8RPI.
 
Ha you shouldn't have said that, next i'll be picking your brains for CNC tips.

3 m/s! Your machine sounds like an absolute beast. Mine is really just a hobby one though its big and will have a cutting area of 6x4 foot. I'll be really please if I can cut well at 5mm/s and get an accuracy of 1mm but then my has only cost me £300 total (excluding the router) so i can't expect much. I'm only looking to slowly cut sheet wood for my other hobbies. I've almost finished the base and linear rails (all self built from stock section and radial bearings), and will mount belts and motors soon.

cheers again for all the help i'll let you know how the new ECU goes.

Kieran
 

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That's pretty slick and seems like a steal at £300. I guess the people that use this type of equipment have deep pockets so there's probably not much of second hand market. I think for my machine the self built linear rails will be what lets it down so when its up and running and i know it works in principle i'll probably invest in some proper linear rails.
 
Hi Robert

Just wanted to let you know that the ECU, key barrel, immobiliser ect.. swap went well (actually very easy and only took about 30 mins... though i did have the dash off already). Fired her up (heart was racing) and although she sounded very rough and blew some good clouds of white smoke at first (presumably the ECU learning the new power train) it soon settled down to a familiar purr (of a cat that's breathed second hand smoke all its life) and most importantly no MIL :D .

Now I know i'm not out of the woods as what ever caused the ECU to fail could occur again and although I don't really know what i'm talking about I somehow feel that there's an outside chance that the MIL could also have been triggered by a sensor/mechanical fault that needs a certain amount of time or drive cycles before triggering the MIL (is there any bases to what i'm saying?). A such I will be praying all the way to the MOT station.

Either way thank you so much for getting me to this point and i'm not sure I would have made it without your wisdom, patients and encouragement. If your ever Plymouth way let me know and there will be dinner and some beers waiting for you.

Will update if anything changes so that other can learn from this issue.

Kieran
 
Hi Kieran,
Happy to help and glad its sorted for you. I doubt the MIL was caused by an enging roblen, just a randm failure of the circuit that switches the light on. The microprocessor "brain" thought it was off.

TThanks for the offer of beer but I don't often go to Plymouth. Last time was in the mid nineties to work on some ship to aircraft radio kit on a customs cutter and I was a lot closer then. You can say "thank you" for a post by clicking on the smiley face in the bottom right corner of the post.


Robert G8RPI.
 
Just a quick update for any people that might come across the same issue I was experiencing. After the ECU was changed and driven quite a bit the Engine MIL light has not returned so it seems a faulty ECU was really the source of the issue and it is quite a simple to process to replace the ECU.

cheers

Kieran
 
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