Disco 2 Fighting one issue, ending up with a new LIST

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Michalis Karatzis

Michalis Karatzis

Active Member
Posts
189
Location
Cyprus
So I was trying to solve a turbo pressure issue that persists for some time now and ended up with a bunch of new issues and no drive!

While trying a new wastegate actuator, removing the inlet hoses to check for delamination etc I ended with engine light on and no drive.
I connected my Nanocom and got the codes below:
02-07 driver demand supply problem
02-08 ambiant pressure circuit
06-07 driver demand supply problem
21-06 problem detected with driver demand
25-06 problem detected with driver demand
25-07 inconsistencies found with driver demand

I did delete the faults and they reappear straight away. I check the voltage for the pedal (don't remember the right terminology) and they are all over the place and going up and down randomly.

What to check now?

ps- when I say no drive I mean the pedal is unresponsive, the autobox engages just fine
 
Those driver demand codes are all caused by the throttle position sensor or it's circuit, make sure it's connector is tight and the ambient pressure is about the airbox sensor/circuit unless it's some ECU missbehaviour
 
Problem solved itself for a while. It reappeared after a short drive but now only acceleration way 3 is not responding. And the fault related to the pedal appears in tandem with ambiant pressure circuit.

Now I have:
02-07 driver demand supply problem
02-08 ambiant pressure circuit
21-06 problem detected with driver demand

I checked the black and red connectors to the ECU and also the connector on the pedal.
 
Another weird thing is that if I clear the fault it doesn't appear if I select Reverse. As soon as I engage any forward gear the engine light comes on and pedal dies.
 
then you have a serious problem, you should rule out the ECM too and if still the same it's a wiring issue between the pedal and ECM and that's a nightmare to chase cos it's part of the fascia main harness, if you can't see any visible damage on the loom from the black plug to the firewall it's better to rewire that whole circuit
 
sierrafery said:
then you have a serious problem, you should rule out the ECM too and if still the same it's a wiring issue between the pedal and ECM and that's a nightmare to chase cos it's part of the fascia main harness, if you can't see any visible damage on the loom from the black plug to the firewall it's better to rewire that whole circuit
Click to expand...

It's beer time...
 
Update

The problem was never found. The next day the car worked as normal and for the last 5 days I have been using it with no issues. I did check for earth issues, wear on the cables from the pedal to the ecu but couldn't find anything wrong. I guess I'll never find out what happened.

One question, while trying to eradicate the issue we changed the setting for the pedal from 3-way to 2-way. It didn't help solving the issue at that moment but we never changed it back to 3-way. Is this a problem? Does it affect anything?
 
I doubt that the MAF/MAP circuit would throw TPS codes... i'm affraid it's not the end, there might be some problem on the TPS circuit too which is isolated for now
 
sierrafery said:
I doubt that the MAF/MAP circuit would throw TPS codes... i'm affraid it's not the end, there might be some problem on the TPS circuit too which is isolated for now
Click to expand...

I read somewhere that the 5V feed from ECU (?) to the MAF/AAP sensor (if I remember correctly) and the TPS is the same so an error at one of the two might be caused by an issue in the other. And you end up looking for the problem at the wrong end.

The problem first showed up when I opened my airbox and the worn cables touched together I guess after the AAP sensor moved with the box cover. Right after that no throttle. Now the cables are taped and everything works fine.
 
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