Thread: 1991 disco tune

No OBD that long ago.

Originally Posted by V8Ian

No OBD that long ago.

NAS cars might have had something, but even if it has one it would need a dedicated scanner. No Aus cars would have had one AFAIK

What do you mean by dedicated, John?
The whole point of OBD was generic access, as limited, but not restricted, as OBD 1 was.

Originally Posted by V8Ian

What do you mean by dedicated, John?
The whole point of OBD was generic access, as limited, but not restricted, as OBD 1 was.

OBD has been around for a long time, Ian. There was no standard for it at all. OBD2 was sort of standardised, but not fully.
On-board diagnostics - Wikipedia


sierrafery discusses the RRC port of that year here:
Location of OBD PORT?? | Land Rover and Range Rover Forum

OBD2 wasn't a requirements in Australian cars until 2006. A quick google indicates Discovery's didn't get an OBD port until 1996. So if there is a diagnostics port on your car, it's likely to need a specific LR computer to talk to it.

I think I have that LR cable with T4 (Testbook) - I'd have to check the Testbook documentation.

For general diagnostics, RoverGauge and a 14cux cable is the solution.

V8 Range Rover classic, TVR, Morgan, Land Rover, 14CUX ECU USB diagnostic lead | eBay

Software and Gadgets to remap the Lucas 14CUX

My 1994 3.9 Disco used to go on a testbook all the time when the check engine light came on - the plug was in the engine bay on the drivers side. Similar to OBD but much earlier. Same as my diesel Freelander - no OBD but there was a port for reading and setting codes etc.