Fuel cut issue!!!
27 October 2010, 06:21 PM
#1
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Fuel cut issue!!!
Im currently experiencing a pain in the A*SE problem that has been narrowed down to a possible faulty ECU.
Im getting fuel cut in all gears and different speeds the problem occurs randomly with no pattern and is noticibly getting worse.
Ive been told that during a live data diagnosis im getting 'low voltage supply' to the idle control valve (certain thats correct) the cel flashes and dosen't stay on. Everytime the cel flashes 'ICV-low voltage' fault comes up each time after being erased from the ECU memory.
The ICV was changed and still the fault occured.
Has anybody got any idea if the low volt fault could be caused by a faulty ECU or for any other reason?
Zak at mocom had the car for the whole day pretty much and he said it was pointing towards the ECU.
Im not sure what 2 do next
Im getting fuel cut in all gears and different speeds the problem occurs randomly with no pattern and is noticibly getting worse.
Ive been told that during a live data diagnosis im getting 'low voltage supply' to the idle control valve (certain thats correct) the cel flashes and dosen't stay on. Everytime the cel flashes 'ICV-low voltage' fault comes up each time after being erased from the ECU memory.
The ICV was changed and still the fault occured.
Has anybody got any idea if the low volt fault could be caused by a faulty ECU or for any other reason?
Zak at mocom had the car for the whole day pretty much and he said it was pointing towards the ECU.
Im not sure what 2 do next
27 October 2010, 06:27 PM
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27 October 2010, 07:12 PM
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ah ok 
Hawkeye JDM STI
Mods as per type 20 kit, sports cat, Miltek, K&N panel filter and remap
No further mods have been done since ive had the car which is approx 18 mths, all these were done by original owner.
Hawkeye JDM STI
Mods as per type 20 kit, sports cat, Miltek, K&N panel filter and remap
No further mods have been done since ive had the car which is approx 18 mths, all these were done by original owner.
27 October 2010, 07:13 PM
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low or high voltage doesnt alway smean that that paticular thing is faulty. it means that the message that sensor is getting sent is high or low so yo uhave to look further into things ie the source of the low voltage thats been sent. Idle air control valve usually brings up a no rpm signal error also
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27 October 2010, 07:14 PM
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low or high voltage doesnt alway smean that that paticular thing is faulty. it means that the message that sensor is getting sent is high or low so you have to look further into things ie the source of the low voltage thats been sent. Idle air control valve usually brings up a no rpm signal error also
27 October 2010, 07:23 PM
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The only other complaint is a slightly blowing exhaust lol
This may have nothing to do with it and may be a load of gibberish but it happens almost all of the time if i go over a speed bump whilst holding the revs at say 3k, the second it 'bumps' over, FUEL CUT and kangarooing for want of a better description lol
Its hard to explain lol and may not have any relevance to the problem, Its just strange that it does it, its making me think something could be loose etc?
BUT then again Zak at mocom checked the car over and said all else seemed fine?
This may have nothing to do with it and may be a load of gibberish but it happens almost all of the time if i go over a speed bump whilst holding the revs at say 3k, the second it 'bumps' over, FUEL CUT and kangarooing for want of a better description lol
Its hard to explain lol and may not have any relevance to the problem, Its just strange that it does it, its making me think something could be loose etc?
BUT then again Zak at mocom checked the car over and said all else seemed fine?
Last edited by subeyman; 27 October 2010 at 07:25 PM.
27 October 2010, 07:31 PM
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Voltage out of the ECU ICV terminal is lower than should be, Zak followed a proceedure (not sure exactly what) after doing what he did should see the voltage increase to what i believe should be approx 5v but continued to stay low, 1v i think? either way he said it was low
27 October 2010, 07:36 PM
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He said all figures during live data were spot on and the 'fault' occured at different revs and boost, totally random and the only prob he could see was the ICV low volt fault.
30 October 2010, 09:54 AM
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30 October 2010, 09:56 AM
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Ive forgotten what the car feels like to drive 'normal' 
31 October 2010, 11:24 AM
#19
I can't see how a good mapper & garage 'Powerstation' cannot diagnose the problem when they had it all day, or has he diagnosed it already?
If he suspects the ECU and car has been there all day, I would be considering buying another ECU. I dont think its a case of plug'n'play as you may need to sort out your Immob. Have you suggested to him that you want the car fixing and returning when done? To fit another ECU is simple, but to configure it to run is what he can do surely.
Rob
If he suspects the ECU and car has been there all day, I would be considering buying another ECU. I dont think its a case of plug'n'play as you may need to sort out your Immob. Have you suggested to him that you want the car fixing and returning when done? To fit another ECU is simple, but to configure it to run is what he can do surely.
Rob
31 October 2010, 12:01 PM
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31 October 2010, 10:22 PM
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ideally id like to find someone on here with 1 and try it it my car so I can literally eliminate the ECU as being the problem, if it is the ECU then ill have to hunt 1 down replace and then remap it, id guess?
Just want my car back to normal
Just want my car back to normal
09 November 2010, 08:33 PM
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How far away from Powerstation do you live Subeyman?
If PowerStations map is still loaded in the ECU then they will have access/ability to modify it during diagnosis.
Might be easier to track down the actual fault before forking out on a new ECU
(they rarely go wrong)
If PowerStations map is still loaded in the ECU then they will have access/ability to modify it during diagnosis.
Might be easier to track down the actual fault before forking out on a new ECU
(they rarely go wrong)
09 November 2010, 08:36 PM
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It's Mocom that's doing the current diagnosis.
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