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Dan t p
Member Since: 22 Feb 2018
Location: Wakefield
Posts: 6
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| Suspect electrical fault - multiple messages intermittently |
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Hi, bit of a long story but I can do with some help!
The current situation is the discovery 4 will bring up warning lights and messages intermittently. I've been trying to narrow down the potential causes so there's a bit of a story (sorry)
I've had the car 6 months and it's blown 4 headlight bulbs (halogen)
The last time the bulb was changed, i started the car after a few hours and the headlights flickered, then the bulb I hadn't changed went out. After a mile or 2 it came back on.
A bit further down the road the car brought up 'restricted performance'. After an hour in a carpark I started the car and all was ok. I tried the obd diagnostics and there were no faults showing.
I had a look around the engine bay for wiring issues and tested the battery and alternator but all ok with those, I did notice the bottom crank pulley was wobbling so, jumped to the conclusion the pulley bonding had failed and allowed it to slip and bring up a fault. Took the car in and had it changed along with a check over and everything seemed ok. The car was driven for 30 minutes and no fault found.
I drove the car this morning without issue, however this evening I set off from work and immediately got restricted performance. I turned everything off and restarted without an issue.
Later this evening I took the car out, stopped and started a couple of times and got gearbox fault, along with several other messages. The car stuck in gear, the suspension lowered and locked and I lost brake assist and stability control. Parked the car up at home and left it 10 minutes. Restarted and all but the engine management light had gone. Plugged my obd reader in and got U0001 fault code. I believe this is a Comms fault on the can bus and related to the front lighting control module.
For those far more knowledgeable than me, does that all make sense and point to a faulty HCM or an I missing something else?
My logic is it seems to only go in to fault at dusk onwards when the lights would turn on.
My only last bit of fault finding is to leave the lights in the off position tomorrow morning and drive to work and see if it faults. Hopefully it won't!
Other things done and checked have been MAP cleaned, battery charged (but new at purchase).
The cars driving me insane, but hopefully this is the root cause.
If it is likely that the HCM is the fault, firstly do the halogen light Discovery's have them (it would fit me if I'd got it wrong!) And secondly where is it?
Last edited by Dan t p on 22nd Feb 2018 8:58 pm. Edited 1 time in total
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 22nd Feb 2018 8:55 pm |
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Sea Raider
Member Since: 01 Nov 2016
Location: None
Posts: 4450
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Firstly, when you say OBD reader, what one do you refer to, is this just a generic one or a dedicated one purpose built for your land Rover?
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| 22nd Feb 2018 8:58 pm |
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Dan t p
Member Since: 22 Feb 2018
Location: Wakefield
Posts: 6
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It's just a generic, but the autologic couldn't find any codes either
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| 22nd Feb 2018 8:58 pm |
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Sea Raider
Member Since: 01 Nov 2016
Location: None
Posts: 4450
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I would suggest that you get a hold of one designed specifically for your Disco, without you won't be able to tell which codes are being thrown up
GAP IID BT is the preferred choice, costly but saves guddling about in the dark with one hand tied behind your back.
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| 22nd Feb 2018 9:00 pm |
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Sea Raider
Member Since: 01 Nov 2016
Location: None
Posts: 4450
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Post up a request for someone on here with an IID to see if they are close enough to you.
Although the IID is VIN locked it does have the capability to read and clear codes from other like vehicles.
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| 22nd Feb 2018 9:03 pm |
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Dan t p
Member Since: 22 Feb 2018
Location: Wakefield
Posts: 6
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I appreciate that the LR specific readers are far better but the code is the code after all.
If I can't get any further I'll take it to LR when I get a chance, but given the logic in the fault finding I'd rather not just stop using logic and wait to use a code reader. Particularly as the fault clears, and as many have commented on the forum, LR can't find a fault if it's not standing.
Edit - apologies, if I had access to the last 2 digits that don't show on the generic but seem to on the IID then I'd know for sure if it was the HCM or another bus feed causing the fault code.
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| 22nd Feb 2018 9:06 pm |
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Dan t p
Member Since: 22 Feb 2018
Location: Wakefield
Posts: 6
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Just had a read. I think it backs up the HCM theory, but has given me plenty of other bits to check if tomorrow's 'don't turn the lights on' trial fails.
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| 22nd Feb 2018 10:15 pm |
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Dan t p
Member Since: 22 Feb 2018
Location: Wakefield
Posts: 6
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Driven to work, lights off, no issues.
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| 23rd Feb 2018 8:28 am |
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SJT
Member Since: 26 Jun 2017
Location: somerset
Posts: 36
  
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I had headlamps that were constantly flickering until recently, it was driving me nuts! My local indi changed the battery and its all been perfect since!! Lovely...
The downside is that the stop/start is now working too. Something new to drive me nuts I suppose! Current - 2016 Commercial SE
Gone - 2014 Commercial XS
Gone - 2015 SE Tech
Gone - 2000 Td5
Gone - 1990 V8 3 door - What a machine!
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| 23rd Feb 2018 8:42 am |
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Dan t p
Member Since: 22 Feb 2018
Location: Wakefield
Posts: 6
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I'd have loved a battery change, unfortunately it was brand new 6 month ago, sits at 13.4v and charges at 14.8v. so alternator and battery seem good.
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| 23rd Feb 2018 9:20 am |
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