Disco 2 Discovery td5 auto cutting out after 2.500 rpm [Solved]

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bahteles

bahteles

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Brazil
Hi guys I've seen this issue here before but there was no solution so let's give it a try.

I'm having this really annoying issue where my truck starts just fine, first try no problem and it runs great for about 15-20 minutes, after that period if I accelerate above 2.500 rpm the engine light comes on and it cuts the power as you can see in the video, sometimes the engine dies completely and after turn off and on again it cleans the engine light and drives fine until I got to 2.500rpm again, this happens on parked or driving.

I got this truck about 2 months ago and I'm fixing the issues myself, it's my first TD5 and so far what I've done is:

- replace the crankshaft position sensor (this really improved my automatic transmission gear change, it was rough before now it more smooth)
- replaced injector loom, new gasket
- cleaned ecu oil (didn't open the ecu, just cleaned the connectors but left it hanging a few hours and very little oil came out)
- replace MAF sensor
- cleaned MAP sensor
- unstuck wastegate lever
- new air filter, cleaned airbox
- new turbo vacuum solenoid





!-- Solved by replacing the Fuel temp Sensor and cleaning the connectors --!
 
Last edited:
Hi, you really need to plug in a nanocom or similar to see the fault code cos even if you replaced the crank sensor it still can be a probem on it's circuit. The EML on Td5 normally comes on only for 3 reasons:
1. crank sensor signal failure
2. throttle position signal failure(though this one used to trigger M+S warnings too), circuit(wiring) issues are also common
3. ECU fault
Replacing parts or chasing wiring issues based on guesses is not a good choice for this issue
 
sierrafery said:
Hi, you really need to plug in a nanocom or similar to see the fault code cos even if you replaced the crank sensor it still can be a probem on it's circuit. The EML on Td5 normally comes on only for 3 reasons:
1. crank sensor signal failure
2. throttle position signal failure(though this one used to trigger M+S warnings too), circuit(wiring) issues are also common
3. ECU fault
Replacing parts or chasing wiring issues based on guesses is not a good choice for this issue
Click to expand...
Unfortunately I don't have access to a Nanocom and importing one would be extremely expensive due to taxes.
All the parts I replace so far were indeed needing replacement but I guess now I have no choice but to go to a mechanic lol.
I think it's either bad wiring or ECU, will post the solution here as soon as I got this fixed
 
sierrafery said:
If it's Eu3 engine i saw rare cases when low fuel pressure triggered the EML cos it logged a driver demand fault code so you can do a test maybe you are lucky, see this https://www.landyzone.co.uk/land-rover/check-td5-fuel-pump-hp.358086/
Click to expand...
This post looks like gold information and it totally makes sense but unfortunately, I'm an ape when it comes to electrical issues 🙈 - I do have a multimeter but I have no idea how to perform this test.

One thing that comes to mind though, is when I replaced the Fuel filter I was not aware of the 5x gas pedal to start the pressurizing fuel test, I just learned about that so I did it now. Not sure if this would affect that much to the point of causing this issue but good to know another TD5 trick
 
Set the multimeter to mV(mili volts) and measure across the small exposed terminals of fuse F10 engine bay with engine at idle
see this (important is at min 5.30) or how the snapshot is
 
sierrafery said:
Set the multimeter to mV(mili volts) and measure across the small exposed terminals of fuse F10 engine bay with engine at idle
see this (important is at min 5.30) or how the snapshot is
Click to expand...

Got around 19.7 - 19.8 so probably good?
 

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sierrafery said:
It's a bit low but seems good cos if it was only on LP should be much lower, as you dont have the codes go by guess and inspect the points shown in this thread cos it's quite common https://www.aulro.com/afvb/discovery-2-a/143155-d2a-td5-misfiring-cutting-out-engine-harness.html
Click to expand...
Mate, what a fabulous thread!

This, plus the oil in the injection loom, plus the dreaded P clip issue.
What a pile of poop is the LR loom!
I am so glad I spent a long time isolating and protecting all the bits of loom both sides of the engine bay, a while back.
But this means I will recheck that I didn't miss this one.
Thanks very much!
 
Since I still didn't figured it out the issue I plugged back the old ckp sensor because the cut out didn't happen, the gear change is not great, it kind of holds shifting but at least I can drive around
 
I might be a bit late to the party here but I had this 12 months ago. When my TD5 Disco 2 hit 2500 RPM it cut out. Every time and you had to restart it from the key which wasn't great on a motorway.

When I investigated I found that the fuel temp sensor had a broken wire and the reading in Nanocom was frozen at a low value (60 degrees?). I tidied up the loom down to the CPS, MAP and fuel temp sensor, checked the oil pressure sensor wiring whilst I was under the bonnet (didn't see anything amiss) and that solved my problem.

Been fine for the last 15k miles
 
Steven Sheppard said:
I might be a bit late to the party here but I had this 12 months ago. When my TD5 Disco 2 hit 2500 RPM it cut out. Every time and you had to restart it from the key which wasn't great on a motorway.

When I investigated I found that the fuel temp sensor had a broken wire and the reading in Nanocom was frozen at a low value (60 degrees?). I tidied up the loom down to the CPS, MAP and fuel temp sensor, checked the oil pressure sensor wiring whilst I was under the bonnet (didn't see anything amiss) and that solved my problem.

Been fine for the last 15k miles
Click to expand...
Not late at all I still have the issue lol but I switch my CKP sensor to the old one, it runs a little rough but at least it never cuts out the engine... Thank you for sharing your experience, I will take a look at this, it's probably a bad wire and I'm really bad with eletrical issue so I'm dragging this for a while
 
sierrafery said:
Are you sure that you didnt miss the EML thing from the first post? cos it's the first time i see that the FT sensor to trigger the EML... and i've seen a lot of Td5 oddities in my life
Click to expand...
I did miss the EML. My bad.... I do remember at the time that I did get the odd EML but I can't say it was the FT that caused it. For me all wiring had got a little hard and brittle down the side and rear of the engine. I fixed the FT wiring which stopped the cut out, calmed down and forgive Betsy (my D2) for a week or 2 and then went through all wiring and replaced everything that looked or felt bad and those issues never returned.

Being a Land Rover it did of course find new treats to throw at me.

At times I feel every owner should write a book based on the sh** that their LR throws at them because quite often none of it makes sense.
 
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