 | Home > Maintenance & Modifications > Fitting speedo healer to Td5 Defender |
 
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| AJC Member Since: 30 Nov 2015 Location: Lancashire Posts: 1363  
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Evening all.
I have bought a speedo healer to fit to my Td5. One of these https://www.jgs4x4.co.uk/copy-of-arb-digit...or-da1441/ Now, I didn’t get any instructions. But from what I can find on google it goes to a plug behind the handbrake back plate. Now, is the hand brake back plate the actual plate on the drum underneath the car. As that doesn’t seem to make sense to me. Thanks [/list] |
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30th Jun 2018 5:25pm |
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| grafty99 Member Since: 15 Aug 2012 Location: North Devon Posts: 4785 
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If you fit it there you will affect the Speedo as well and it will under read. You want to do it immediately before the ECU so it doesn't alter the speedo, only the speed the ECU is sent
 2002 90 Td5 Station Wagon
1990 Vogue SE Triumph Tiger Explorer 1200 Td5 90 Thread http://www.defender2.net/forum/topic50767.html Tdi 110 Thread https://www.defender2.net/forum/topic69562.html RRC Thread http://www.defender2.net/forum/topic54492.html Instagram http://www.instagram.com/george_grafton |
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30th Jun 2018 6:49pm |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6609 
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Are you fitting this to get cruise working with a 1.222:1 transfer box? If so it needs to either fit behind the dash and be used to break the signal wire from the speedo to the ECU, or at the ECU end of that wire which is in the seat box.
 1988 90 Td5 NAS soft top
2015 D90 XS SW |
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30th Jun 2018 8:23pm |
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| AJC Member Since: 30 Nov 2015 Location: Lancashire Posts: 1363
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Martin. Grafty.
Thank you. Yes it’s to be used with CC install with a 1.2 box. I’ll leave that to the job of the auto sparky then. Assume I just need to utilise the small box and not the extension loom then. Will it gain power feed from the ecu wire or does it need 12v as well? |
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30th Jun 2018 8:50pm |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6609
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It needs 12V and ground as well yes.
1988 90 Td5 NAS soft top
2015 D90 XS SW |
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30th Jun 2018 8:51pm |
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| grafty99 Member Since: 15 Aug 2012 Location: North Devon Posts: 4785
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If the connections are done under the seat box (where I did mine) there is an ignition live there ready and waiting
2002 90 Td5 Station Wagon
1990 Vogue SE Triumph Tiger Explorer 1200 Td5 90 Thread http://www.defender2.net/forum/topic50767.html Tdi 110 Thread https://www.defender2.net/forum/topic69562.html RRC Thread http://www.defender2.net/forum/topic54492.html Instagram http://www.instagram.com/george_grafton |
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30th Jun 2018 8:59pm |
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| AJC Member Since: 30 Nov 2015 Location: Lancashire Posts: 1363
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Awesome. Thanks chaps. 👍🏼
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30th Jun 2018 9:07pm |
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| Harry.O Member Since: 25 Jul 2014 Location: Warwickshire Posts: 715 
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My speedo reads accurately with 285 75 tyres so I installed the unit between the instrument cluster and the ECU near to the main black ECU plug as per Grafty and Martin's suggestions, that way it alters the pulse signals to the ECU but with no adjustment to the speedo.
Mind didn't come with the plug-in loom so I hard wired it. The red cable on the Speedohealer needs an ignition live, the black cable needs an earth. I cut the yellow/white ECU wire coming from terminal B13 on the black ECU plug, connected the white wire to the speedo gauge end and the green wire to the ECU end. A few mins using the website instructions to programme it and it's worked perfectly for the last 18 months. 2005 Td5 110 Hardtop
1989 300Tdi 90 Soft top 1992 200Tdi 90 Truck cab with Land Cruiser axles |
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2nd Jul 2018 8:08am |
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| AJC Member Since: 30 Nov 2015 Location: Lancashire Posts: 1363
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Superstar Harry. Thank you
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3rd Jul 2018 9:02pm |
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| Pepsyseventy Member Since: 12 Dec 2024 Location: Bevaix Posts: 5  
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Hi, I found this instruction to make the cruise control works:
it needs to either fit behind the dash and be used to break the signal wire from the speedo to the ECU, or at the ECU end of that wire which is in the seat box. Could I hev more details or electric scheme to make it? my Land rover mechanic installed the speedohealer in the back of the handbrake where ther is the plug but I think for the pourpose of the cruise control is wrong Thanks! |
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12th Dec 2024 9:47am |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8049  
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Just for my knowledge.
Speedo healer but not used to adjust the speedo. So what role is it used in here ? Presumably a 1.2box gives wrong output speed to a cruise unit and this adjist it? Cheers James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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12th Dec 2024 2:02pm |
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| jonny Member Since: 10 Mar 2013 Location: North Wilts Posts: 154 |
The TD5 ECU expects a certain ratio of revs to road speed for cruise control to engage, which is based on a 1.4 transfer box.
If you put a 1.2 transfer box in, the ratio changes which means CC won't engage, as the ECU thinks there's something wrong. The solution is either to fit a speedo healer between the back of the speedo and the ECU to 'fool' the ECU, or to adjust the ratio within the ECU itself via nanocom or similar.. |
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12th Dec 2024 2:37pm |
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| jonny Member Since: 10 Mar 2013 Location: North Wilts Posts: 154 |
The speedo sensor in the transfer box is wired back to the speedo head. The speedo head then sends a modified speedo pulse to the ECU. If your mechanic fitted the speedo healer between the sensor on the transfer box and the speedo head, then it won't fix the cruise control issue. It needs to be between the back of the speedo and the ECU. |
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12th Dec 2024 2:40pm |
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| Pepsyseventy Member Since: 12 Dec 2024 Location: Bevaix Posts: 5
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Could I hev more details or electric scheme to install thespeedo healer back on the dash? Thanks
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12th Dec 2024 2:44pm |
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