Hi all,

I'm new here, I have recently just purchased a 2003 Disco 2 TD5 commercial but its developed a couple of problems, some of them ive sorted but I cant figure out why it wont start now!

I realised the day after getting the vehicle home, it didnt start very well from stone cold, it would crank over for around 10 seconds then fire up and would start on the button every time after its initial cold start.

I borrowed a Snap On diag machine and had a noisy crank sensor fault recorded and doesnt start atall now! Turns over nice and fast, fuel pump primes and stops after a minute or so.
I checked the common oil in ecu problem and it had signs of oil. I removed the ecu, drained any signs of oil, cleaned all the connectors blocks and replaced the injector harness under the rocker cover. It didn't start still so I purchased a new crank sensor and fitted that this morning and still doesnt start.

on the Snap on diag machine the crank sensor was reading 0 rpm on crank and would sometimes jump to 30rpm.

I believe the problem has to be the crank sensor not showing the ecu its cranking and hence wont start.

Has anyone come across this problem before and if so where was the fault located? Im thinking either oil in the engine harness or ecu at the moment.

Ive searched the internet and forums for starting issues but cant find any specific threads related to this problem

Many thanks Ash

Hi ash

You should introduce yourself first in the intro section


Mine has done this before and needed new glo plugs but don't ask me anything about it as I know bugger all and the garage fixed it.

Hope that helps

i will do an intro thread shortly.

AshStevens said:

i will do an intro thread shortly.

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. Welcome to the forum.

AshStevens said:

Ive searched the internet and forums for starting issues but cant find any specific threads related to this problem

Many thanks Ash

Click to expand...

Hi, you'll find enough answers just take your time Land Rover Zone - Search Results , and for the code http://www.landyzone.co.uk/lz/2995786-post4.html

Still can't find why the crank sensor isn't reading any rpm on crank. Trawled through so many threads!

sounds like you need a new crank sensor

As above I've already replaced it

continuity check on the wires from the plug to ECM, though double cheking with a dedicated LR tool(hawkeye, nanocom, lynx, etc) would be good before that... if there's still residual oil in the red plug it could make tricks too

Hi

I had the same problem this time last year. Without a crank reading the engine will not start, it will just keep turning over.

As you have replaced the ranks sensor it only leaves 2 the problems:
1. The wires for the sensor are damaged. You can check the continuity of the wires at the ecu plug. I did this by soldering a 2 wires each to a sewing pin. I then inserted the pin through the wire. From this I could put the multimeter on it to check the readings. I also unplugged the crank sensor and did the check to make sure they weren't shorting out.
For me this all checked ok.
2. I took the lid off my Ecu, it was quite obvious the problem from water. What you could do is try your ecu in another Disco ( i don't think it works in a defender). But first, write down the injector codes from both your car and the test car. You can get injector codes by either lifting off the rocker cover or with diagnostics, read the codes. When you plug your ecu in to the next car, you will need a diagnostic machine. 1. Learn securtity. This codes the ecu to the 10as alarm unit. 2. program the injector codes.

Sounds complicated, but really its not. As above you will need nanocom, hawkeye etc.

I use the hawkeye. For this you don't need a pc or anything else unlike the early nanocom.

If its ecu, I got a cheap one off ebay with the same code. They are either the early MSB or the later NNN. Ideally a NNN is better and can be reprogramed.

I feel you pain.
Mine has just packed in AGAIN!

Starter motor.

It is known for a faulty starter motor to draw to much current. in doing so the voltage going to the ecu is below the threshold, (App. 10.5v). If this is the case then the ecu shuts down. Jump starting or bump starting may help diagnose this.

Ruari said:

It is known for a faulty starter motor to draw to much current. in doing so the voltage going to the ecu is below the threshold, (App. 10.5v). If this is the case then the ecu shuts down. Jump starting or bump starting may help diagnose this.

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The starter usually causes a cranking but no start situation because it sufferes from internal arcing.These sparks send nasty spikes back up the main feed cable,they are strong enough to corrupt the crank sensor signal and confuse the engine ecu.

eightinavee said:

The starter usually causes a cranking but no start situation because it sufferes from internal arcing.These sparks send nasty spikes back up the main feed cable,they are strong enough to corrupt the crank sensor signal and confuse the engine ecu.

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I stand corrected to some degree. I do recall this.