Before I buy an Electronic Fule Injection Control Unit... - Defender Source
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  #1  
Old May 12th, 2015, 06:05 PM
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Stephen LeBlanc
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Before I buy an Electronic Fule Injection Control Unit...

Hi all.


I have a 1994 D90 NAS. Working on getting it running again. Noticed that the fuel pump wasn't getting power. I followed the lines to the emergency shutoff switch and confirmed that it's not the issue. I know the pump works fine when powered, as I ran power straight to it. I also confirmed everything is properly grounded. So I guess the only thing left that it could be is the Electronic Fuel Injection Control Unit.


Thoughts? Suggestions? Can anyone recommend a place to buy, or better upgrade to the product I need?


Thanks in advance.
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  #2  
Old May 12th, 2015, 06:07 PM
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John B.
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Have you checked the fuel pump relay?
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  #3  
Old May 12th, 2015, 06:40 PM
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Quote:
Originally Posted by Red90 View Post
Have you checked the fuel pump relay?
Thanks. Yes I forgot to type that. Relay works fine.
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  #4  
Old May 12th, 2015, 07:37 PM
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Quote:
Originally Posted by EnduroPro View Post
Hi all. I have a 1994 D90 NAS. Working on getting it running again. Noticed that the fuel pump wasn't getting power. I followed the lines to the emergency shutoff switch and confirmed that it's not the issue. I know the pump works fine when powered, as I ran power straight to it. I also confirmed everything is properly grounded. So I guess the only thing left that it could be is the Electronic Fuel Injection Control Unit. Thoughts? Suggestions? Can anyone recommend a place to buy, or better upgrade to the product I need? Thanks in advance.
Read the 14cux diagnostics pdf.

There are a couple of signals required to get the fuel pump powered up. The white and black wire from the -ve side of the coil is one.

Have you opened the ECU up? On 1994's they had a habit of filling with water. Any rover 14CUX ECU is compatible ... Cheapest is to try one from a friends truck before buying one from eBay.
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  #5  
Old May 12th, 2015, 09:37 PM
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Stephen LeBlanc
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Thanks Jason. So should I purchase that ECU reading tool? I'm game if there is value in it versus the code box under the passenger side dash.


Is this the PDF that you were referring to? http://ecumate.com/docs/Ecumate%20inst.pdf


Nope, I didn't open the ECU but for what it's worth, the D90 has been garaged for 4 years. If any water was in there, it's long gone, but perhaps corrosion left.
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  #6  
Old May 12th, 2015, 09:52 PM
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Or should I look into the Roverguage app? Sorry for the rookie questions. I've been out of it for a while.
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Old May 12th, 2015, 09:58 PM
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Quote:
Originally Posted by EnduroPro View Post
Thanks Jason. So should I purchase that ECU reading tool? I'm game if there is value in it versus the code box under the passenger side dash. Is this the PDF that you were referring to? http://ecumate.com/docs/Ecumate%20inst.pdf Nope, I didn't open the ECU but for what it's worth, the D90 has been garaged for 4 years. If any water was in there, it's long gone, but perhaps corrosion left.
Pull open the ECU .. If it's clean then at least that's a useful data point.

The ecumate doc is informative but there is a better doc for troubleshooting. I have an ecumate but to be honest it's no better than a rover gauge app.

http://www.landroverweb.com/Pdf-file...-Injection.pdf

This is a decent doc.

Does the truck prime? A short buzz from the fuel pump when turning the key? If it does then the wire from the coil signaling spark would be my next test. It runs through the 'chicklet' near the MAF. Runs to pin 39 on the ECU.

The relays are known to be a trouble spot for some people. Make sure they are both the metal type and working properly.

Without that signal the ECU won't run the fuel pump.
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  #8  
Old May 12th, 2015, 10:43 PM
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question.. the new replacement relays from AB are plastic.. any issues with them - i replaced mine (preventive more than anything else really old ones were fine)
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  #9  
Old May 12th, 2015, 11:42 PM
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Robert Lynch
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might have answered my own question.... as an experiment i reinstalled the metal relays, and my semi hard start is gone.. only thing i can figure is that the silver ones "Fire" faster to the fuel pump.. nothing else was changed. trucking sitting battery disconnected for 4 days..
Does not seem like that would matter... since its just electricity but i guess it does (maybe).

anyway i have 2 spares i know work (plastic) until i can find some metals ones i guess.
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  #10  
Old May 13th, 2015, 01:01 AM
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You should be able to get an ECU for $100-150. The disco I 94-95 and RRC from 91ish to 95 work fine although the case is different so it won't mount up. If it works, you can swap cases, if not, you have a spare ECU to test.
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  #11  
Old May 13th, 2015, 08:40 AM
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I would think there is any significant difference between the speed the relays engage, and if there was, that it would matter. Maybe plugging/unplugging the relays cleaned the connections a bit?
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  #12  
Old May 13th, 2015, 09:12 AM
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Chris Davis
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I have heard that unplugging the battery and/or ECU does have an effect as the ECU is self learning particularly for initial idle settings. Anecdotally this has seemed true to me over the last 15 years and the truck, for the first couple quick drives, isn't as smooth as later drives. I believe it re learns fuel profiles and IAC settings, but others may have more specific info.
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  #13  
Old May 13th, 2015, 09:19 AM
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Stephen LeBlanc
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All awesome info! Thanks friends! My mechanic buddy and I will be chipping away at this later this week. I'll have responses to some of the questions above, etc.


Keep the discussion going! Loving it!


Thanks again!
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  #14  
Old May 13th, 2015, 01:17 PM
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Robert Lynch
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Quote:
Originally Posted by cgalpin View Post
I would think there is any significant difference between the speed the relays engage, and if there was, that it would matter. Maybe plugging/unplugging the relays cleaned the connections a bit?
My thoughts too.. The connections looked clean and not oxidized.. A relay should be a relay...
Dunno but it did help to reinstall the old ones
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  #15  
Old May 13th, 2015, 01:32 PM
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What is the condition of the battery? Is it fully charged? Often you'll find a wide variety of electrical problems go away with a full battery.
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  #16  
Old May 14th, 2015, 06:45 PM
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Stephen LeBlanc
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Battery is full and solid. Thanks. I'll be tinker with this soon. So if it is in fact the Electronic Fuel Injection Control Unit, any suggestion on where to shop online for one?
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  #17  
Old May 14th, 2015, 07:40 PM
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Highly improbable that it is the ECU.
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  #18  
Old May 14th, 2015, 09:53 PM
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Stephen LeBlanc
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Originally Posted by o2batsea View Post
Highly improbable that it is the ECU.


Thanks Bill. Sending PM.
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  #19  
Old May 15th, 2015, 07:57 AM
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Have you cleaned all the electrical connections since it's been sitting 4 years.
I have a spare ECU if you want to borrow it to rule out your ECU… just pay shipping roundtrip.
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  #20  
Old May 15th, 2015, 08:21 AM
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Stephen LeBlanc
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Originally Posted by Kevin88RRC View Post
Have you cleaned all the electrical connections since it's been sitting 4 years.
I have a spare ECU if you want to borrow it to rule out your ECUÖ just pay shipping roundtrip.


Kevin, that was super kind of you to offer. My buddy wants to work on this with me next weekend, so I jumped the gun and scored a 14CUX one on Ebay for $110. They offer a 14 day return policy. So I went that route. Thanks again for the offer. I'll keep you all posted.
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