Member Since: 25 Mar 2019
Location: Lincoln
Posts: 67
disco3 won't crank or start
Not sure why this has happened, but did the lock unlock cycle 5th time horn beeps, and it started once, now no cranking or anything. As soon as you put the key in the ignition, the interior lights come on and hazards flash. I've checked and charged battery, checked and isolated the alternator, run vehicle from mine. I've checked and changed the brake light switch. I checked all bulbs and both rear brake light bulbs had blown, so changed those. Checked all fuses and relays, removed fuse box under the engine bay no signs of water or loose wires. Checked earth strap on the O/S wing and no issue found.
Plugged in the scanner and reset, all faults cleared. Still nothing no cranking. Dash reads System fault and suspension fault (car has lowered itself so no concern there). Re checked the codes and got the following:-
U0155-87 Intermittent Lost comms with instrument cluster control module
U0122-87 Permanent Lost comms with vehicle dynamics control module
U0128-87 Permanent Lost comms with parking brake control module
U0100-87 Permanent Lost comms with engine control module/powertrain control module
U0001-87 Permanent High speed CAN communication bus
We sent the clocks of to a repair place in Essex so can rule those as the issue out. There was faults on them which were fixed.
Come to wits end here so any further info or help would be massively appreciated. Spent hours checking things to no avail.
From one desperate landy owner to this wonderful audience.
Member Since: 25 Mar 2019
Location: Lincoln
Posts: 67
Hi flack,
Thanks for the reply. I have removed the plugs from the top and checked them all looks ok, but I haven't fully unbolted it and checked the ecu itself.
Was being normal drive to the stables fine no warnings then came back to it and this. 🤔
6th May 2020 9:53 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4580
A bit of a wild card this, but the positive battery lead might be shorting on the front diff. Its not an uncommon fault which can obviously cause all sorts of issues depending on how badly it is shorting.
You would have to get the engine trays off to check this. Follow the cable across the front of the sump behind the crank pulley and then to the left side of the car towards the diff, and just satisfy yourself it has not been chaffed by contact with the front differential.
The images below provide a visual of a fouled cable before and after intervention.
Member Since: 25 Mar 2019
Location: Lincoln
Posts: 67
PROFSR G - would that be the positive cable for the starter? bit difficult to get under it at the moment with it lowered to the ground lol, but will try and tow it onto some ramps or blocks as its a non runner.
7th May 2020 1:24 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4580
Yes it is the starter positive cable from the battery. Be careful trying to pull this very heavy vehicle up onto ramps!!
I would consider this very dangerous, and if you wish proceed you will need to contemplate now the consequences if it goes wrong. And there's a lot than can go wrong with such a manoeuvre!!
If you are on solid ground it might be better to place a trolley jack under the left chassis rail behind the front wheel and partially lift enough until you can get a support in place. Then do the other side and alternate until you have the desired height.
Be careful!yµ (idµ - eAµ) ψ=mψ
7th May 2020 3:30 pm
Hot Tub
Member Since: 15 Aug 2017
Location: Milton Keynes
Posts: 1071
Have you a second key Do you hear any noises from solenoid, fuel pump when ignition is turned on just a couple of thoughts might point in the right direction. Welsh Collie Chauffeur Service To Barney & Rooney.
7th May 2020 3:50 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10336
tbh I con't think it's the power cable. So don't do damage checking.
flashing hazzard lights is a sign of a certain failure. Can't remember what though
can bus or cjb failure or similar.
Did you try a battery disconnect over night already ?
7th May 2020 5:07 pm
Briscoe05
Member Since: 25 Mar 2019
Location: Lincoln
Posts: 67
Cheers for the replies guys.
hot tub - yeah have a second key and it does the same. I can lock unlock the vehicle fine. As soon as key goes in the ignition the hazards flash it locks unlocks and then stops locking but hazards continue. I've checked all looms on engine bay and plugs nothing obvious. All fuses are good and relays seem to be fine.
Quote:
tbh I con't think it's the power cable. So don't do damage checking.Â
flashing hazzard lights is a sign of a certain failure. Can't remember what though Â
can bus or cjb failure or similar.Â
Did you try a battery disconnect over night already ?
Yeah left disconnected all night and even did the positive to negative discharge for a couple of hours and no joy. Checked all bulbs as well.[/quote]
7th May 2020 9:06 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4580
Pete K wrote:
tbh I con't think it's the power cable. So don't do damage checking.
It was a bit of a "wild card" Pete and it does have the hallmarks of PCM / CJB failure, but in the absence of any fault codes it might be worth a punt so long as safety is observed.
The other thing which might be related are the earth straps!
By the way, Briscoe05 what diagnostics are you using?yµ (idµ - eAµ) ψ=mψ
7th May 2020 11:11 pm
Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1771
Is there any water in the car? damp mats etc
8th May 2020 7:20 am
Briscoe05
Member Since: 25 Mar 2019
Location: Lincoln
Posts: 67
Hi globetrotter448, theres no water ingress inside the car that I've seen. It's a gs so no sunroof. May have to pull pcm out for the sins.
PROFSR G - I have posted the codes below which are coming up on my diagnostics machine which dont look good as they're showing permanent? Is there a way to test the tcu?
cheers folks.
9th May 2020 8:04 am
Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1771
Can still get in via the scuttle and "A" pillars, check whether the cabin filter is damp.
9th May 2020 9:38 am
Briscoe05
Member Since: 25 Mar 2019
Location: Lincoln
Posts: 67
Will have another look, but dont think so as the car stopped during the dry spell where it was hot, not run since 3 weeks ago lol
9th May 2020 9:47 am
Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1771
Whilst in there, check the connectors on the CJB as they can give odd ball problems
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