Help with OBD

Disco101 · Jul 26, 2012

Hi I was wondering if somebody can help me I have done a search and can't find the answer I have a 94 discovery v8 and I want to read the fault codes but the only readers I can find are for 96 cars on wards (OBD 2) after a bit more research I found out my disco should have an led screen with 2 numbers on it located under the seat I have looked and the only thing under there is the cd changer and crumbs,mud,leaves ect lol so do models with the cd changer have the screen in a different location ?

Thanks Jim

discool · Jul 27, 2012

LED screen under the seat! on a 200 series disco, where did u read that?

Disco101 · Jul 27, 2012

Mine is the 300 series and I read it on the net somewhere might might have been in America so I guessing it's not fitted to uk cars

POAH · Jul 28, 2012

94 will be a lucus 14CUX ECU which is not OBD2.

ECUmate 14CUX engine diagnostics, Ecumate Ltd

what is wrong that you need a fault reader?

Disco101 · Jul 28, 2012

Well When I got it the idle was all over the place and te bloke I got it off said it was vacuum related so I checked the vacuum advance unit and it was busted so I changed that and it's better but not 100% so I wanted to see if it has any codes like air flow sensor or coolant sensor ect so I can fix the fault and not just chuck money at it hoping for a fix

POAH · Jul 28, 2012

you bought it even though it was broken - you're worse than me lol

idle problems can be down to various issues - check the voltages on the AFM to see if they are giving the correct values.

discool · Jul 28, 2012

Disco101 said:
Mine is the 300 series and I read it on the net somewhere might might have been in America so I guessing it's not fitted to uk cars

Then you have a 1995 disco, as 300s were introduced with the 95MY.
Anyway if you have a decent multimeter you can do a few test yourself, this link will explain.

Standard ECU 1

Disco101 · Jul 28, 2012

Yea I know but it was too good to pass on

. Well that's strange because it's a 300 series for sure and it's a 94 on an L, thank you for the link looks like I getting
My multi meter out tomorrow !

discool · Jul 28, 2012

Don't you mean the year of registration was 1994, you have a 95MY disco on sale from March 1994, 1994MY disco were still the 200s..

It's the same at the other end, some 1998MY D1s were registered in 2000 that doesn't make then a 2000 D1.

Disco101 · Jul 28, 2012

Now I am confused lol so it's a 200 even tho it looks like a 300 it's the same as what you have in you picture

POAH · Jul 29, 2012

have a read of this page

Fuel injection

JD · Jul 30, 2012

Just a bit of info on OBD to help clarify maybe. As far as I know it wasn't standardised or mandatory until 2001/2002 so anything prior to this, whilst having an ECU with a diagnostics connector, might need specialist kit (faultmate etc) to communicate with it rather than just a generic OBD reader.

Disco101 · Jul 30, 2012

Ar right thank you for that a trip to that garage it is then

discool · Jul 30, 2012

Disco101 said:
Now I am confused lol so it's a 200 even tho it looks like a 300 it's the same as what you have in you picture

Registration and model year are totally different things, you have a 95MY disco registered sometime after March in 1994

wolf · Aug 4, 2012

Disco101 said:
Well When I got it the idle was all over the place and te bloke I got it off said it was vacuum related so I checked the vacuum advance unit and it was busted so I changed that and it's better but not 100% so I wanted to see if it has any codes like air flow sensor or coolant sensor ect so I can fix the fault and not just chuck money at it hoping for a fix

It could be a a vacuum leak from elsewhere as well - have you tried the 'Carb-cleaner' routine where you run engine and spray cleaner at likely leak spot and listen for an increase in rpms? This will help you with obvious leaks at the throttle-body (but keep a fire extinguisher on hand - just in case you ignite the carb-cleaner outside of the intake or combustion areas) but for tougher leaks you will need to smoke the engine (i.e., a smoke machine pumps in smoke under pressure and it will show up where a leak is occurring).

Help with OBD

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