V6 starting issue

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Originally Posted by gamini

good I found this.. I am having the same problem of P 0335 code on my 2008 DIsco 3.. I got this car recently and the previous owner has been driving for 3 years with this error.. Now it , at times refuses to start, or starts and dies. I cleared the code and it appears again with the check engine lamp.. I like this to go away and going to follow your lead and install a negative cable.. Still I am lost as to how this new loop can solve the issue. The main negative cable is bolted not that far from the power steering pump .

Where did you get the original document from.????

Cheers mate..... Gamini Adelaide..

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I got it from Home | TOPIx (jlrext.com) but they have changed the subscription options.

From what I understand the issue is the Cam Sensor is exposed to electrical noise from the starter motor which interferes with it sending its signal to the computer. The extra earth cable provides a better earth to reduce the noise.

As mentioned in this thread the fix above did not solve my problem but removing, cleaning and replacing the cam sensor did solve it. I would suggest doing this first then add the earth cable if you're still having issues.

I had a subsequent issue with the engine running rough and stalling at traffic lights which turned out to be a faulty EGR Valve / MAP/MAF? sensor (they are a complete unit in the V6 Pertrol). AFter I had that repalced I haven't had any other issues with the engine. 260k+ now and still going strong.

Yes after replacing the crank position sensor problem seems to have gone away. I have not driven the car much , but started many times and the lamp did not come on. Access to the sensor was not easy . I had to remove the battery and all other vac pipes and battery case etc in order to gain access.. Had a small lamp suspended in the cavity between body and the bell housing and also a flat mirror positioned so that I could monitor what I was doing. All standing on a milk crate.!!!.

The cam position sensor is relatively better positioned and I would replace that if the light comes again. The earth cable was already there installed by land rover , before I bought the car.

If you have time... read on..........

From my previous experience with another British make ; A ford transit MK7 , I am now contemplating installing some TVS diodes at power input stage of the ECM.. This solved the problem in the Transit case, where the main ECM was destroyed beyond recovery at the time of cranking.
(That too in the middle of nowhere near King's canyon, resulting in a tow from Alice Springs to Adelaide.). That way any negative voltage induced on the positive line and any positive induced voltages above 15 volts will short to ground.. I noted several of these in the ECM itself. but failed to operate in the Transit.
(The electronics there is Siemens ... I recollect).
It makes me wonder how these 30 year old Japanese automobiles with EFI still start and run with no warning lights and no smoking ECMs.. Some thing to be inferred.... Cheers.....

By the way, selling the LR3 is now of serious consideration and I would revert back to my Isuzu MUX which has none of those problems.I have had it for 3 years..