 | Home > Td5 > 2000 TD5 Defender - ABS Not Working |
 
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| rgh.key Member Since: 14 Jan 2025 Location: Stoke on Trent Posts: 14   
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So after some digging around in the 1999MY Electrical Schematics and some probing with a multimeter I found that the stray cable was C0508-3 which is the feed to the ABS Return Pump relay, this cable was live and was a permanent feed protected by a 30A fusible link, it would have been interesting if that had shorted against the side of the seat box!
 Click image to enlarge Looking at the ABS Return Pump relay it was apparent that the cable had corroded from the relay base connector, plenty of green copper corrosion everywhere. Click image to enlarge I wonder if this is the sole reason for the ABS ECU fuse been disconnected? I am going to order some new connectors and try to repair the loom and re-introduce the relay, once this has been done I can find a 30A fuse, Interestingly for the eagle eyed viewers you will see that Fuse 2 is shown in the drawings as been 20A however, on the back of the fuse box it states 20A, and the cable from to the ABS ECU is only 2mm² so it would be interesting if that ever got shorted against anything, pretty sure the maximum current capacity for 2mm² is around 25A anyways I am geeking out, needless to say I shall be putting in a 20A fuse! Click image to enlarge |
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15th Jan 2025 6:36pm |
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| rgh.key Member Since: 14 Jan 2025 Location: Stoke on Trent Posts: 14
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Connectors arrived! due to the state of the original cable on the wiring loom I have had to cut back quite a way to get some fresh undamaged copper, due to this I have made a cable extension that I plan to fit to the original loom using either a crimp connector or a WAGO connector, as its a 30A circuit I will probably opt for the WAGO which is rated to 32A, most if not all of the crimp connectors are only 16A at best!
I have used some 4mm² Tri-Rated cable and soldered and crimped this to the new 9.5mm relay pin for additional reliability given the last one corroded most likely due to moisture between the crimped connector and the cable I would imagine. Connector ready for installation: Click image to enlarge |
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15th Jan 2025 7:06pm |
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| rgh.key Member Since: 14 Jan 2025 Location: Stoke on Trent Posts: 14
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A question for everyone does the ABS ECU self cancel faults on startup or do they need to be cleared by a diagnostic tool?
I plan to power up my ABS ECU tomorrow for the first time in goodness knows how long, I believe I have rectified one fault with the Pump Relay so hoping that it works... is there anything I should also be aware of or check when doing this or just pop in the fuse and hope for the best. Ideally don't want to make anything any worse than it already is  as at the moment it does drive and stop normally. |
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15th Jan 2025 9:40pm |
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| NickMc Member Since: 01 Oct 2014 Location: Norn Iron Posts: 1641  
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For future reference those connections should just be crimped not soldering and the bottom set of “ear” crimps are for around the insulation, that’s for strain relief  |
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15th Jan 2025 10:55pm |
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| 4RF RDS Member Since: 19 Jul 2015 Location: Ottawa Posts: 950  
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You’ll need a scan tool to clear hard codes. 2010 Range Rover MkIII Autobiography Super Charged (Idris) 2003 Range Rover Mk III (Desmond FitzWilliam) 2000 Defender 110 CSW TD5 (CTX) 1992 Range Rover Classic (Lizzy) 1972 Series III 300 Tdi (Stanwood) 1967 MGB GT Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats. H. L. Mencken (1880 - 1956) |
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16th Jan 2025 5:51pm |
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| rgh.key Member Since: 14 Jan 2025 Location: Stoke on Trent Posts: 14
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Do you have any recommendations on the best hand tool to use, I understand that these do not use the standard OBD or OBD 2 protocol, I’ve done a little research into Nanocom, this seems to be far to comprehensive for wha I need, is there an affordable scanned just for clearing codes not for programming or tuning.
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16th Jan 2025 6:00pm |
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| 4RF RDS Member Since: 19 Jul 2015 Location: Ottawa Posts: 950
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I have a Nanocom and an iCarsoft 930 (NLA). You might find a new old stock on eBay or elsewhere, but make sure its an i930 specific to JLR. It reads and clears my TD5 no issues. Mostly I use it for my 2010 L322.
I also have the OBD Dongle and run Td5 SPY, which gives live data while you drive and also scans and clears. Lowest cost would likely be an iCarsoft 930, LR2.0 or 3.0. Just my experience… since you asked 🤷♂️. I am sure others might chime in with suggestions. https://www.nanocom-diagnostics.com/produc...er-td5-kit https://www.icarsoft.com/Product/s-332-ica...aguar.html https://www.td5spy.co.za/ Good luck 2010 Range Rover MkIII Autobiography Super Charged (Idris) 2003 Range Rover Mk III (Desmond FitzWilliam) 2000 Defender 110 CSW TD5 (CTX) 1992 Range Rover Classic (Lizzy) 1972 Series III 300 Tdi (Stanwood) 1967 MGB GT Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats. H. L. Mencken (1880 - 1956) |
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16th Jan 2025 6:21pm |
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| rgh.key Member Since: 14 Jan 2025 Location: Stoke on Trent Posts: 14
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Ordered a iCarsoft LR V2.0 hopefully will be here for Monday so I’ll wait until then to plug the fuse back in, then I can clear the codes and see if the pump relay was the fault that made the previous owner remove the fuse, it would definitely cause a fault but surely, it would have been diagnosed, then again if you popped in a reader I would imagine it would say pump fault and I know that they are expensive for Defender specific ABS Pumps so it would have probably led to the outcome I have found.
Interestingly I understand that the Discovery 2 ABS pump is fully compatible, even thought the documented ports have the incorrectly wheel location of the Discovery it’s apparently works, this does make sense as the ECU just ports controls the 4 output ports so it’s not particularly vehicle specific. |
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16th Jan 2025 7:23pm |
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| 4RF RDS Member Since: 19 Jul 2015 Location: Ottawa Posts: 950
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Indeed its the shuttle valves inside the ABS module which fail and yours is about the right age (to have failed). I would suspect that your corroded relay would not be the only issue but I hope it solves it for you... 🤷♂️
Yes a Disco module is completely compatible with the Defender. Just ignore the markings on it, as you said, and pipe the brake lines exactly as they were. Good luck 2010 Range Rover MkIII Autobiography Super Charged (Idris)
2003 Range Rover Mk III (Desmond FitzWilliam) 2000 Defender 110 CSW TD5 (CTX) 1992 Range Rover Classic (Lizzy) 1972 Series III 300 Tdi (Stanwood) 1967 MGB GT Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats. H. L. Mencken (1880 - 1956) |
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16th Jan 2025 7:32pm |
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| rgh.key Member Since: 14 Jan 2025 Location: Stoke on Trent Posts: 14
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4RF RDS a quick question regarding the shuttle valves if these have failed what can I expect to see, at the moment the Defender brakes okay, I am assuming this is because all of the valves are open to the callipers as the ABS pump is still fitted to the system I understand that the brake fluid passes through the pump even thought it’s got no power, I’m a little worried that I may power up the ABS ECU and completely mess up the braking system especially if one of the valves was to fail in a way that impede the brake fluid to one of the callipers. This may be just my lack of knowledge of how the ABS system works so any information would be greatly appreciated
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16th Jan 2025 7:58pm |
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| 4RF RDS Member Since: 19 Jul 2015 Location: Ottawa Posts: 950
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That is a possibility that things could be weird. If you disable the system by removing fuses it shouldn’t activate… but! It is a relatively primitive ABS system. Once powered up you’ll know quickly. You can also replace just the valves in situ and try that before a module replacement or rebuild.
Completely messing up the system is really hard to do. It is designed to work if the ABS fails. Only thing I have experienced is hard pedal and brakes randomly coming on but fuse removal stopped it. Good luck 2010 Range Rover MkIII Autobiography Super Charged (Idris) 2003 Range Rover Mk III (Desmond FitzWilliam) 2000 Defender 110 CSW TD5 (CTX) 1992 Range Rover Classic (Lizzy) 1972 Series III 300 Tdi (Stanwood) 1967 MGB GT Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats. H. L. Mencken (1880 - 1956) |
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16th Jan 2025 8:59pm |
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| rgh.key Member Since: 14 Jan 2025 Location: Stoke on Trent Posts: 14
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Thank you! I will keep you posted on my progress, probably won’t have any news now until Monday, but I really appreciate the help so far!
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16th Jan 2025 9:29pm |
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