Disco 2 DTCs - any thoughts?

Hi all, after owning my D2 for 8 years, she's been really good to me, but I've had a few issues over the last couple of weeks.. which I think, with help from this forum, are now sorted. It's got me thinking I should be showing her a little more tlc. I have a cheaper diagnostic icarsoft i930, which lets me read codes and clear some of them, but not all.
I currently have the below DTCS showing. I know at least some of them have been there a while, but can't clear them, so not sure how many are a current problem. Question is, is there a possibility a few of them are all being driven by a single issue (I'm specifically thinking of the injector ones perhaps pointing at needing a new Injector harness, which looks like quite an easy and cheap job)?
I'm toying with the idea of getting a hawkeye, but the original ones seem to go for well over £100 even 2nd hand, the total hawkeye is around £300, but looks like it does all landys straight out of the box? Will either of those definitely let me clear those DTCS?.. I also need to clear the "latched aircon fan"..after an overheat. Erring toward the "total", because when the time comes for the d2, I'd definitely look for a newer discovery or range rover..
Faults showing:
Ambient pressure circuit fault. Logged low
Manifold pressure circuit fault. Logged high
Ambient air temp circuit fault. Logged high
Fuel pump drive open load fault. Logged
Glow plug relay drive open load fault. Logged
Turbo overboosting fault. Logged
Road speed missing fault. Logged
Topside switch failed. Logged
Injector 1 open circuit detected. Logged
Injector 2 open circuit detected. Logged
Injector 3 open circuit detected. Logged
Car seems to be running ok, although obviously not quick.. and I only get c400 miles to the tank, but pretty sure that's been the same for years, as it's mostly short trips?.
Sorry to waffle on, any moments of inspiration greatly appreciated!

Sadly, the iCar thing is known to give results on the diesel Disco 2 which are, shall we say less than truthful, especially the older iCar devices. The problem is that the diesel D2 was never totally compliant with OBDII protocols. For this reason there are only a small number of fairly expensive code readers which are designed to work with the Land Rover protocols used on the D2.

Before you get too vexed about the results shown by your current code reader, especially since you say that the vehicle seems to be running satisfactorally until you can get the codes read by a suitable device.

Regarding the air-con, it's one of those systems on the D2 which is "stand alone" and consequently has its own diagnostic test sequence, however, the Nanocom can be used to test the operation of the A/C clutch and the A/C cooling fan in front of the condenser matrix.

Thanks for response, doesn't surprise me that the i930, isn't as functional given the gap in price, but it has been useful over the years, at least in clearing different flashing lights ..so had my monies worth.
I've been through the ac diagnostic, but get 00 so no fault that end , my understanding is that the aircon is doing exactly what it should and it's the ecu telling it to stay on and can only be cleared by resetting the ecu, hence the need for a hawkeye or nanocom.. If I could guarantee the car would live for another few years I wouldn't hesitate..but there's no guarantees in life I guess!

Ush said:

Thanks for response, doesn't surprise me that the i930, isn't as functional given the gap in price, but it has been useful over the years, at least in clearing different flashing lights ..so had my monies worth.
I've been through the ac diagnostic, but get 00 so no fault that end , my understanding is that the aircon is doing exactly what it should and it's the ecu telling it to stay on and can only be cleared by resetting the ecu, hence the need for a hawkeye or nanocom.. If I could guarantee the car would live for another few years I wouldn't hesitate..but there's no guarantees in life I guess!

Click to expand...

Obviously, the thing to do would be to find somebody who has a suitable code reader.

IME, the Hawkeye is a decent tool, but it is not a Nanocom... and I say this as someone who bought a Hawkeye, and, to some extent regrets it .

If you are going to go more modern at some point, ( I'm not - no way in hell ), then I wouldn't even consider the Hawkeye - go for the Nano now, and you should be sorted for many many years .

And I also second Brian47's comments regarding the Icarsoft doohicky - know to give rather "variable" results on LR stuff in general of this age due non compliance with OBDII - If you're lucky, you might find a few of those "codes" the Icar thing has read, simply disappear with a proper code reader ( I.E. Nanocom ).

Hear what you're saying about nanocom and if, they were the same price there'd be no question, but I'm on the fence about paying £300 for a hawkeye for a 16 year old car and the only way I can really justify that is with it covering other landrovers so will future proof me for the next one. Just can't see spending £450, especially when it looks to me like the nanocom is model specific, so I assuming another big chunk of change if you want to change it to a different landy?

If you are going to spend any money at all on a LR diagnostic tool,the Nanocom is the only one worth considering as a private owner.It is a very good tool, I bought mine simply to code secondhand key fobs on customers cars.It has certainly earned its keep.As I bought the TD5 version of it I was very pleased to find it will happily talk to Defender TD5's as well.Just this evening at 6 pm it helped me to diagnose a failed engine ecu on a Heritage Defender 90. I think I paid about £385 for my Nanocom,quite a while ago I considered it to be very cheap. Back in 2003 I bought Testbook T4, with the Vat it cost me £10,786. The sum stuck in my mind as it seemed so much. Looking back it was cheap as it meant I had a spot on diagnostic tool which earned its keep over and over again,still working faultlessly now.

Yes, i'm sure that many of those fault codes are false... for example with topside switch failure the engine would not start whatsoever

Ush said:

Hear what you're saying about nanocom and if, they were the same price there'd be no question, but I'm on the fence about paying £300 for a hawkeye for a 16 year old car and the only way I can really justify that is with it covering other landrovers so will future proof me for the next one. Just can't see spending £450, especially when it looks to me like the nanocom is model specific, so I assuming another big chunk of change if you want to change it to a different landy?

Click to expand...

Yes, the Nanocom is "model specific" but additional unlock codes can be purchased from BBS.
If, or when you feel the need to get rid of your D2 and not upgrade to another LR vehicle you will always find a buyer for a second user Nanocom. Just think about the trouble you've had trying to find a second hand one yourself.
If you decide to sell the D2 on as a working vehicle, you could even stick another 300 quid on the price for the Nanocom.
Apart from that, with an aging vehicle, the possible need to get the codes read to fix a problem is going to start getting expensive if you have to visit the Main stealer each time.

Thanks for all the advice, luckily I'm not in a particular rush , going to keep an eye out for what's around second hand..
Even so, I might consider changing the injector loom, unless someone tells me different, it just feels like a few of those errors could be down to that and with it looking like quite a quick / cheap job ...Guess it couldn't hurt? Might be worth the £25, even if I just get a bit more mpg.. Reading some of the comments on this site, starting to think the 400 miles I get from a tank might be a little light?

Ush said:

Thanks for all the advice, luckily I'm not in a particular rush , going to keep an eye out for what's around second hand..
Even so, I might consider changing the injector loom, unless someone tells me different, it just feels like a few of those errors could be down to that and with it looking like quite a quick / cheap job ...Guess it couldn't hurt? Might be worth the £25, even if I just get a bit more mpg.. Reading some of the comments on this site, starting to think the 400 miles I get from a tank might be a little light?

Click to expand...

The usual symptoms for the injector loom beginning to fail are rough running, odd engine behaviour, misfiring, poor starting or oil traces in the red plug on the ECU. Those fault indicators often appear long before any faults get logged.
This bloke has done the job and documented it very well. It might be worth taking a look:-
http://www.discovery2.co.uk/Injector_harness.html
TBH, I've not heard of the injector harness being the cause of excessive fuel consumption, but it's a Land Rover, anything's possible.
As others have said, with a compatible code reader many of those fault codes could well vanish completely, so why go chasing problems which probably don't exist?

sierrafery said:

Yes, i'm sure that many of those fault codes are false... for example with topside switch failure the engine would not start whatsoever

Click to expand...

ive had a top side failure fault it started ok but cut out if you tried to rev it

Any advice which amounts to "if it ain't broke", is my favourite kind .. I'll leave the loom for now and keep an eye open for a decent but of diagnostic kit, then I'll have a better idea of any real problems. As I say the car is running as well as it ever has, I'm just trying to make sure I don't miss something which bites me later on. I'll treat her to some oil and filters over the next couple of weeks, perhaps that will be enough for her to behave for a while longer!

jamesmartin said:

ive had a top side failure fault it started ok but cut out if you tried to rev it....

Click to expand...

Yes this could be aniother symptom, i should have said the engine would not run instead of not start even though the non-start is more common or it's specific for the ''topide switch failed pre-injection"... the gist is that with that topside switch fault if it's real the vehicle is unusable