Thread: OBD1 vs OBD2

Some good info and explanations here:
OBD 2 And OBD 1 Explained | Diy Auto Repair | Auto-Facts.org

Cheers,

So in summary the differences are:

1. OBD1 has a slower baud rate
2. OBD1 is more vehicle/ brand specific
3. OBD1 has higher failure tolerances

Any opinion if a scan gauge will work and is there an adapter available?

Why not take a drive over to Wooders Garage (the distibutors) in Hornsby and plug one in. I wanted one for my Freelander which does have an OBDII port but is not OBDII compliant - it didn't work.

It works in my RRS but it does only have basic code reading and clearing functionallity. The engine monitoring functions are great but the trip meter functions are not very accurate.

Garry

Regardless of the diagnostics standard the Disco 2 has been built up to (though I'd believe is EOBD/J1962) you need to realise that there is a world of difference between a generic scanner / code reader and a specific Land Rover diagnostics tool (of which there are currently several end user affordable models).

The D2 has several control modules depending on its configuration:
EMS (Engine Management System): Motronic for the V8 and MEMS for the Td5
EAT (Electronic Automatic Transmission)
SLABS (Self Levelling Suspension + ABS)
ABS (for vehicles without ABS)
BCU (Body Control Unit)
SRS (Air bags and pretensioners)
ACE (Active Cornering Enhancement)

A generic scanner will only allow you to connect to the EMS and possibly some areas of the ABS control module and read codes and live data (advanced models only) within the EOBD standard ONLY (which are not all of the codes/data streams that Land Rover uses).

Land Rover specific diagnostic tools such as Faultmate or Hawkeye connect to each one of the control modules within the vehicle, enabling the user not only to see but also to change things, i.e. programming FOBs, calibrating ride height, setting injector codes, etc.

Have a read:
http://forum.landrovernet.com/showthread.php/196714-TD5-OBD2-compliant-or-what-ISO-standard-does-it-follow-diagnostics
http://www.landyzone.co.uk/lz/f8/discovery-ii-diagnostic-port-reading-45757.html
http://www.lro.com/forum3/viewtopic.php?f=18&t=63706

Next time I drive past Hornsby I'll visit Wooders Garage, but in the mean time I want some real time monitoring tools.

Mturri you are right (at least IMO) - I understand that the scan Gauge is generic but it will sit on the dash, where as the Hawkeye and fault mate are bulky. From what I’ve seen there are two kinds of tools out there, The ones that sit on the dash (scangauge/madman) – these just read from the OBD. Then there are those that interact with the LR systems (Hawkeye/faultmate). Further from what I’ve read the Hawkeye/Faultmate are great for the TD5 but over kill for the V8 and the Scangauge/madman will not add value to the TD5 owner but is all that is available to the V8 owner. Basically they are different. Both good but different.

Thanks for those links and I’ll read them to try and I identify the best tool for my 1999 D2 V8 4.6 LPG dual fuel. I have a budget of $500 for a tool that will let me monitor my engine with data that will warn me of a potential failure to that engine and its ancillary systems.

I’d be interested in hearing from any D2 V8 owner. TD5 guys are just too different, nice but different ;-)

OH and I have a OBD1

Originally Posted by GEK064

I’d be interested in hearing from any D2 V8 owner.

I run a Bluetooth generic OBD-II reader on mine, with a netbook I also use for GPS stuff.
More info on the unit here: http://www.aulro.com/afvb/electronic...th-obd-ii.html

There's a few pages of posts there, so do please read through them. I made a number of posts on that thread complete with screen shots showing what it does and doesn't monitor, so I don't really fancy repeating here again and duplicating posts.

For the basic (but important!) info "on the go", I think its great. Running engine temp is the one I watch most, but there's tonnes of other data. It can be used for clearing generic error codes logged by the O2 sensors and other "useful" ones, but will not see the "3 amigos" codes, unfortunately. Full scan in approx 2.5 secs.
If I get any issues that I think are of concern, I simply take a screen shot there and then and give to my mech for his comments/thoughts. Has helped a number iof times in quickly diagnosing problems.

Any Q's, please let me know and I'll answer if poss - but be warned, my technical knowledge is limited to say the least!

Originally Posted by GEK064

I have a 1999 D2 (tenth VIN letter is X) and as far as I've worked out I have a OBD1 (five pin plug bottom of the internal fuse board)

Thought ALL D2 V8's were OBD-II....? Sure you're looking at the right plug there??

Cheers,

I've never seen a D2 without OBD2. It's in the D/Side footwell, left side in the black plastic panel.

OBD1 plugs are mfct specific, and usually require bridging several different connections in different configs depending on what you want to see and then you need to pass advanced applied counting techniques to read the codes from the light flashing on the dash. For instance, toyos can flas every .5 sec, 1 sec, 1.2, 1.5 or 2 sec in some models and then there are pauses of different times as well.

Thanks god for OBD2. Can you imagine a LR implementation of that?

A ray of hope maybe? I'd read that OBD2 compliant was only with cars with a VIN tenth code of Y onwards? I'll recheck again (with glases on this time) but in the right side in the fuse panel I found a 5 pin socket, which is was i assumed to be OBD1. I'll be back next week and will check. thanks for the feedback