ECU relocation loom - Defender Source
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  #1  
Old March 3rd, 2012, 10:18 AM
maleger
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Marc-Andre Leger
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ECU relocation loom

I have purchased a wire loom from a scrapped vehicle and a Lucas 14CUX ECU which I have cannibalized for the connector. All this for about 150$. With this I am making an ECU relocation loom. Also, I have contacted Amphenol to try to purchase additional 143-70011 model male and female connectors.

I'm not sure of the exact length I need to relocate the ECU, but I will measure this. I plan on butting the ECU in the rear, on the wing top, in a custom box that also houses my batteries (1 on each side). This should be well above any reasonable water line and should also allow field replacement of the ECU if needed. I'm working with an initial guesstimate of 10 feet. I'm also looking to get a 40 pin round MIL-Spec bayonet connector, to make an extension that may be easily modified. I still am awaiting return emails from manufactures on this.

There are 38 wires on the recovered connector, so if I make a 10 foot loom, I will need about 380 feet of AWG 16 copper wire. I have found some info on the cabling:

https://docs.google.com/document/d/1...RJ6I1oiQlguHeY

If I need to buy more than 1 connector, is anyone interested in this ?

As a geek, I think I can build this is 5-6 hours. So my initial estimate is for a cost of about 300$ + my time. To me this represent about a 600$ cost. I have no intention of selling looms, but I think it may be necessary to buy larger qualities to get manufacturers to sell the parts I need... Hence this post. I would be happy to resell the extra parts at cost, mostly extra 143-70011 connectors. Wire can be purchased at your local electronics supply store.
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  #2  
Old March 3rd, 2012, 10:35 AM
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Andrew Dance
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Would the additional resistance of the wire and connectors cause any signal problems?
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  #3  
Old March 3rd, 2012, 10:47 AM
maleger
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Marc-Andre Leger
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I can't see that it would as this is an analog signal with no actual data transferred on the 14CUX. I was planning on shielding the assemble for EMI with a metallic mesh under a heat-shrink and plastic loom cover. The key is more likely the connections and splicing of the cable if I have to use the canibalized cable assembly an extend the wires. But I plan to weld the fire and individually heat-shrink wrap the connections.
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  #4  
Old March 3rd, 2012, 12:50 PM
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William Skidmore
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A few years ago there was a company in the UK making extended ECU cable so that you could place it just past the front seats or the like. Might want to look them up. Vague info, I know.
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  #5  
Old March 3rd, 2012, 02:03 PM
maleger
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Marc-Andre Leger
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Hi, I did research this, but they don't make it anymore.
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  #6  
Old March 3rd, 2012, 02:54 PM
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Doug Crowther
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I wanted to do this on my 94 and was told the resistence signal from the mass air sensor/ airfow meter would be screwed by the additional connectors and wiring length. I'm hoping that was bs-let us know how your project works out
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  #7  
Old March 19th, 2012, 02:00 PM
maleger
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Marc-Andre Leger
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The loom is now made: https://picasaweb.google.com/1080011...eat=directlink

Still needs to be tested. It's 10 feet long with 16 AWG cable for most connectors except a few bigger blue wires in 14AWG for the O2 sensors (they where bigger wires, so I replaced them with a larger caliber cable). Now to test... I have a spare ECU to use for that purpose.

FYI, it took about 150$ worth of wiring (380 feet) and about 6 hours to cut, weld, heat-shrink and test conductivity of the 38 wires. For future reference on the forum, I'm including this info:


"Bottom Row" - pins 1 to 13 (they're numbered from left to right as shown in the photo)
1 Red/Green Idle bypass valve - circuit 1
2 Brown/Orange Power feed to the fuel injection main relay
3 Yellow Throttle position sensor output/reference - see also 20 and 25
4 Black Oxygen sensors (ground) and to the relay that powers their heater coils
5 Grey/Black Tune resistor (through VIN LA451517 only) Not used on my 1994 D90
6 Yellow Road speed input
7 Green/Blue Coolant temperature sensor (input) - see also 25
8 Purple/Yellow Windshield defroster input, if fitted
9 White/Light Green Diagnostic connector output
10 Black/Yellow "Check Engine" lamp
11 Yellow/White Right bank of injectors - cylinders 2, 4, 6 and 8
12 Blue/Red Main relay "request"
13 Yellow/Blue Left bank of injectors - cylinders 1, 3, 5 and 7

"Middle Row" - pins 14 to 27 (they're numbered from right to left as shown in the photo)
14 Black Ground
15 Brown "Battery" supply
16 Blue/Purple Fuel pump relay "request"
17 Grey/Yellow Purge control valve output
18 White/Pink Diagnostic connector output
19 White/Grey "Ignition" supply
20 Red Throttle position sensor (input) - see also 3 and 25
21 Yellow/Black Air conditioning thermostat input, if fitted
22 Blue/Red Air flow sensor (input) - see also 25
23 Blue Signal from the LH oxygen sensor
24 Blue Signal from the RH oxygen sensor
25 Red/Black Ground side of coolant, fuel, airflow & throttle-position sensors
26 Green/White Idle bypass valve - circuit 1
27 Black/Grey Ground

"Top Row" - pins 28 to 40 (they're numbered from left to right as shown in the photo)
28 Blue/Grey Idle bypass valve - circuit 2
29 Orange Idle bypass valve - circuit 2
30 Black Fault display data
31 Black/Green Diagnostic connector "request" input
32 Grey/White Fuel temperature sensor (input) - see also 25
33 Black/Grey Air conditioning compressor clutch relay, if fitted
34 Orange/Black Transmission gear switch signal
35 Blue/Green Air flow sensor (input) - see also 25
36 Black/Green Air conditioning condenser fan output, if fitted
37 (Not Used)
38 Brown/Black Fault display data
39 White/Black Engine speed signal cable (harness includes 6.8k ohm resistor)
40 Black Ground
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  #8  
Old May 14th, 2015, 09:26 PM
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Stephen LeBlanc
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Any update on this?
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  #9  
Old May 15th, 2015, 07:53 AM
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Mike
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Did the 14CUX harness have shielded data lines? The GEMS data lines have a copper sheath that is grounded that covers each data line.
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