Thread: TD5 Driver Demand Faults

I am getting closer, the fault is now intermittent, but I have not yet been able to nail the issue.

I started with the instrument cluster, there are 2 main plugs to the cluster PCB I removed them & it made not difference, so I pulled out the PCB & inspected it & it looks ok, no burning or anything that looks like it could be an issue, so I then started checking & cleaning the plugs in the engine bay & dash, some where along the line I have moved or disturbed the problem as it is now intermittent. I can start it about 10 times in a row without any dramas then out of know where the fault comes back again, tomorrow I will keep going with disconnecting & cleaning plugs in hope of finding the culprit, but at least there is light at the end of the tunnel.

I also noted that the voltage as sense by HawkEye with the engine is now dropping down to about 13.5v & almost down to 13.2-12.9v with heavy electrical loads such as the aircon on, but the main battery voltage checked with the meter is always just above 14v, or dips slightly lower when the load comes on then recovers to about 14.1v.

How is it going Col found anything more?

It is going backwards mate, as mentioned above it was running fine from time to time, yesterday it seemed to be running well so I put it back together so I could take it for a test drive but once I started it for a drive the fault was back worse than ever, I now have about 5 or 6 driver demand faults as well as ambient pressure sensor faults.

I ran a meter over the plug @ the pedal & it does not look good, the 2 x 5v supplies are now down to 0.1v and worse still when you check them to earth there is a short, they are showing the same resistance as the 2 x earths, the 3 track wires are now also showing between 130-180 Kohms resistance to earth, so somewhere along the line I have a major short. Someone else will know better than I do but I am guessing it maybe the ECU power supply is going to ground.

I will send the ECU over to the UK for testing & replace it if required as I am now going in circles. I popped the lid on the ECU again to see if there was any change & it still looks & smells the same inside.

Col
The AAP has a common source with the 5 V feed on the Potentiometer
This is what I read in another post anyway
This is likely a hint as to the issue
Based on this its possible that sending the ECU to the UK will not fix it.

I would be pretty much over it by now

Thanks mate, I have pretty well had a gut full of it now and just want the thing to work.

Without having another ECU to try it with I am going in circles not knowing if the fault is in the ECU or vehicle itself, that is one of the reasons I want to send the ECU to the UK to confirm if it is either good or bad, then I can go from there, as it is now I have no idea what to check next.

Hi Col, I am not familiar with mail procedures etc to Dubai but I may still have a spare EU2 known good working ECU you are welcome to borrow?

JC

Hi Justin, thanks for the offer it is greatly appreciated.

If I was in OZ I would jump at the offer but to send it internationally twice & clear customs twice especially back into OZ being a used unit is probably a bit to hard. Thanks again for your kind offer.

I will bite the bullet & send mine to the UK next week.

Originally Posted by djam1

Col
The AAP has a common source with the 5 V feed on the Potentiometer
This is what I read in another post anyway
This is likely a hint as to the issue
Based on this its possible that sending the ECU to the UK will not fix it.

I would be pretty much over it by now

I just checked & there is 5v @ the AAP, so it is not the power supply, but I am still no closer to knowing what it is.

At times like these I with I had my 200 tdi back.