Thread: Disco2 problems

Originally Posted by djam1

A D2 is not full OBDII so that device might have limited ability to read the codes

I am between the Wirrabara and Melrose and have a Nanocom but it’s for a TD5 Defender that might be able to read the codes not sure

I get some details from the OBDII device, but not alot, Just ebayed a nanocom for the D2, damn thats expensive..

Originally Posted by donh54

Td5 was never intended for the US market, which, at the time was the only market that required full OBD2 connectivity. Hence the V8 got it but not the diesels.

Just bye the bye, have you checked the Throttle Position Sensor?

No, but that is one of the OBDII things that work, and I can see the gauge moving as I press the throttle

Originally Posted by bsperka

Could be that your MAF sensor is faulty. Takes 30 or seconds for the ECU to determine that there is no signal and use default values. You'll need someone with a Nanocom or similar to see what values the MAF is putting out as the D2a isn't OBD2 compliant. Or try disconnecting the MAF although you may only get the same result....

Google how to test the MAF with a multimeter, this may assist in determining if that's the cause of the issue. Can't see it being the throttle potentiometer if it works ok the rest of the time.

I had thought of that, so I used youtube to check with a multi-meter, according to what he said all my voltages were correct, and it did change while I reved the motor, so by that I am guessing the MAF is ok, and using the OBDII it shows the throttle is moving correctly, but I havent tried it first start... will try that...

Originally Posted by Lemo

Do you get any fault light on the dash?
If you first start car in park will it rev?
Is it only on first start in the morning or at every start?

Was this happening before the auto service?

Really need to get a proper test device nanocom or hawkeye and see if it's throwing codes - You can search for a willing member here https://www.aulro.com/afvb/electroni...ostic-systems/

And would be good to check the throttle with said tester

Hope this helps?

Cheers Lemo

No fault lights on the dash, yes it will rev in P or N just not D or R, usually only the first start in the mornings, haven't noticed it do it any other time, yes I did an auto service thinking that maybe a problem,

Some simple checks you could do and a known problem is the cabling to the XYZ switch and auto get chafed on top of the auto, something to check??

Originally Posted by revird

No fault lights on the dash, yes it will rev in P or N just not D or R, usually only the first start in the mornings, haven't noticed it do it any other time, yes I did an auto service thinking that maybe a problem,

So - just guessing here, probably wrong - could the XYZ be allowing the vehicle to start in P and N, but not to run in D or R?

You haven't mentioned cleaning the MAP sensor which is on the inlet manifold.

Regards Philip A

Originally Posted by revird

No, but that is one of the OBDII things that work, and I can see the gauge moving as I press the throttle

Ok, Had the OBDII thingy going while I pressed the accelerator, the guage on the torque app moved with the pedal, 100% when flat to the floor and moved according to my foot, but the motor did not rev.. had to drop into P or N rev then into D