Eberspacher D2 - Control Unit

[awol]

I have just been relieved of £40+ by my local Eberspacher service joint and told that my ECU (~£300) is shot. The heater works happily with their service unit but won't get past the start up purge on mine and just runs the fan without ever getting to ticking the pump

On the grounds that it is rubber-ducked already, I thought I would get inside the control box and see what I could see, buzz out, or otherwise probe. It is not immediately obvious how to get into the unit (the control unit not the heater). Has anyone cracked one of these and if they had a circuit diagram ....? Please?

 

[Heckler]

I have just been relieved of £40+ by my local Eberspacher service joint and told that my ECU (~£300) is shot. The heater works happily with their service unit but won't get past the start up purge on mine and just runs the fan without ever getting to ticking the pump

On the grounds that it is rubber-ducked already, I thought I would get inside the control box and see what I could see, buzz out, or otherwise probe. It is not immediately obvious how to get into the unit (the control unit not the heater). Has anyone cracked one of these and if they had a circuit diagram ....? Please?

Ive attempted it, they are filled with plastic rubbery stuff, taking it apart pulls bits off the PCB. I found it a waste of time. The ECUs have been changed, the way to tell is the new ones have a tape wrapped lead.
Ive seen them for just under £200 on Ebay, but, you take a chance!
Stu

 

[awol]

Ta. Looks like I'll try brute force and ignorance - nothing to lose!

 

[alteredoutlook]

my ecu died a death and i got a new one for £300 (.....i keep trying to forget!). I gave my old one to an electronic guru who wanted to investigate. He said the very act of unscrewing it to investigate it broke the interior parts.

He reckoned it was a cheap trick on the part of the manufacturers - for the cost of a broken 50p transistor/integrated circuit/capacitor/etc you are forced to buy a brand new unit for £300.

No wonder the germans have such large export earnings.........


You may be more lucky!!

 

[pcatterall]

Sorry! yes a common fault ( fan comes on straight away at med speed...nothing else will work)
Often associated with the thermostat settings. On several occaisions I have made them start by simply connecting the yellow trigger lead to red positive ( thus bypassing the heaters internal thermostat) . The heaters then worked but only for a few start ups when the original problem came back and stayed! Try it and see.
As Skipper Stu says they are not repairable, you can lever off the top and carefully scrape off the rubber protection revealing th eboards below. The componants do seem to be epoxied down to the board so hard to remove. Concentrating on and following the thermostat circuit may help focuss but I just got lost. I have sent several away to various experts keen to give it a go but all have failed to date!!
Get for around £200 from 'deisel heaters 4 U' Ali Asner from Turkey, make sure it is one as advised by SS with the cloth tape wrapping as they are the latest version and ( at this time) seem to be more reliable.
Good luck!!