testing an eberspacher d2 heater

[kongking1]

hi guys
i've just obtained an eberspacher d2 heater and need to test it to see if it works or not before i spend any more money on buying extras for it. at the moment i've got the heater, a fuel pump and a digital 7 day controller. does anyone know how to wire the heater up to a 12v battery just to see if it works. there is a multi plug on the heater with a red and brown which are obviously live and earth, but would i need to bridge any of the other wires together for it to start working. the fuel pump side i've managed to work that one out as there's only 2 terminals but the pump has 12 wires coming out of it and i don't want to fry it.
now i know that there's people on this forum that could wire one of these things up in their sleep so any advise would be most welcome.
thanks russ

 

[pvb]

You can download a D2 manual here - it has wiring details.

 

[kongking1]

thanks for the reply mate but i was hoping for a more direct answer like connect this to that and then connect to a battery and away you go. that type of thing. i'm a complete plank when it comes to these heaters and the eberspacher website just shows too many wires for my liking.
thanks again russ

 

[JerryHawkins]

12 wires from the fuel pump!!! Eber fuel metering (solenoid) pumps don't usually have any wires - just two terminals either for a clip-on plug or discrete spade connectors. Are you sure? Do you have the small cabin air temperature sensor to go with the timer?

If you list the 12 wires by colour and relative size, I'll see if I can give any further guidance!

 

[PembrokeshirePromise]

Well - apart from the 2 heavy duty ones for the main power supply and the 2 to the fuel pump I think the rest just allow different types of controls to be plugged in. The one I just fitted used 5 wires (though I suspect only 4 actually did anything) to connect to a rotary rheostat type switch with 4 levels.

I take it you have no control switch for it ? I'm afraid I don't know which 2 or more wires you can bridge to test - suspect it might be slightly more complicated than that I'm afraid

 

[kongking1]

hi guys
my mistake, i should have said 12 wires from the heater. there are red and brown which are live and earth,then there's another ten as follows. yellow, green/red, brown/white, grey/red, blue/white, grey/black, pink, blue/black, blue, and grey. complicated aren't they.
the thing is, i read on the web that this guy bench tested his heater by bridging 2 wires together after supplying power to the heater and it ran continuosly, but i can't find the webpage now.

 

[pcatterall]

Not really complicated but it is a problem buying from ebay unless you are prepared to a bit of research.

 

[JerryHawkins]

red = power (+)
brown = ground (-)
yellow = switch
grey = temperature sensor
grey/red = temperature setting
blue = diagnostic
blue/white = diagnostic
brown/white = ground
black = to vehicle ignition accessories
green/red = metering pump
grey/black = ?
pink = ?
blue/black = ?

- Connect red to battery +ve and brown to battery -ve (these two should be bigger
diameter cables than the others)
- Connect green/red to one of the fuel pump terminals, -ve to the other
- when you connect the yellow to +ve , this will signal the heater to start
(disconnect yellow to signal heater to stop (don't disconnect battery)

Which model 7 day timer do you have? Is it about 2"x3" with an LCD display? How many connections are there to this? Any numbers of colours?

 

[Heckler]

as another poster said, red is positive, brown is negative, use THE SAME THICKNESS WIRE to connect to a battery, they are voltage sensitive and need a lot of amps to start, the pump uses the two green and green and red wires, the yellow wire is the start and stop wire. connect this to positive to start and disconnect to stop. there is no control with this method. the little controller has 4 wires on it if i remember right, connect the red an brown as a supply to the red and brown power to the eber, all eber controls do this, connect the yellow to the yellow and i think the last is grey and something, again connect this to the eber same coloured wire, the control will start flashing digits, press the clock button and set the clock then push the wavy line button and it will go thru the start sequence.
i sell eber d2s on ebay, they mostly come out of bt vans and half the harness is left in the van, i wire them up properly so that when a buyer gets one they just have to connect a red and black wire to the battery and put the pipe in a jar of diesel to test it. witht the greatest of respect if you cant read or be bothered to understand a circuit diagram then you are going to struggle!!
stu

 

[kongking1]

thanks for the replies, i will give it a go tomorrow.
Let you know how i get on.
thanks russ

 

[roysheriff]

Hi people. I read with interest the comments as I to am trying to get my heater working.
When I connect the red and brown then touch the yellow the systen clicks but nothing else.
If I run the +&-ve to the pump it only clicks when I touch one of the connections. If I leave it connected it remains silent.
When I connect it to the loom knowing there is a strong voltage to the pump there is no sound.
does this mean that both pump and heater are broke?

 

[crumblencustard]

Sorry for bumping an old thread

Hi, this is where Google landed me, so sorry for bumping an old thread.

So..... On a budget and did buy an ex BT eber d2 from ebay.....these things happen...

Anyways, before I go and buy a pump (which didn't come with it ) I'm trying to figure if the unit is working.

Connected the thick brown and thick red as should be.....

Then made a switchable connection for the yellow to the red....to simulate the unit being switched/ signaled on and off.

Nothing else is connected.

When I power up.... nothing

When I switch my signal wire (the yellow) I get a click of a relay or solenoid internally but thats it.

With out the pump is this what is expected? Or should the fan spin, or glow plug warm up? Or anything else for that matter.

Or must I really bite the bullet further and purchase a pump to be able to test further?

Thanks in advance.

 

[staarek]

hi there,

How long did you leave it connected for? From my experience with hydronic unit, it needs to be connected for quite a while before anything starting to happen.

 

[pvb]

When I switch my signal wire (the yellow) I get a click of a relay or solenoid internally but thats it.

With out the pump is this what is expected? Or should the fan spin, or glow plug warm up? Or anything else for that matter.

Or must I really bite the bullet further and purchase a pump to be able to test further?

It won't start without a pump connected. I'd suggest you download an instruction manual before you do anything else. If you don't install the thing correctly, it will give you problems.

 

[lw395]

a...... witht the greatest of respect if you cant read or be bothered to understand a circuit diagram then you are going to struggle!!
stu

But it's a lot easier with Jerry's excellent info above.
The Eber info does not make it clear that most of the wiring is optional.
Always better to ask and risk looking a bit silly than struggle or damage something.

It is important to switch off via the yellow wire, maintaining power with the main cables, as the heater will go through a shut down process, keeping the fan going to clear fumes after stopping the burner etc. If you don't let it do this, it will register an error and may refuse to start next time.

 

[crumblencustard]

Thanks.... I have the manual and wiring diagrams

However it doesn't state, and i can't find online the start up process the unit goes through. This would help to see if the unit (airtonic) is going through its start procedure up before it detects the lack of fuel or pump.

If it's just a click great...I'll buy the pump and accessories
If it does more than a click before the pump/ fuel is detected as missing then my unit is faulty.

So really just curious if anybody knows the start up process/ diagnostics that the ecu goes through. Thanks

 

[Heckler]

Thanks.... I have the manual and wiring diagrams

However it doesn't state, and i can't find online the start up process the unit goes through. This would help to see if the unit (airtonic) is going through its start procedure up before it detects the lack of fuel or pump.

If it's just a click great...I'll buy the pump and accessories
If it does more than a click before the pump/ fuel is detected as missing then my unit is faulty.

So really just curious if anybody knows the start up process/ diagnostics that the ecu goes through. Thanks

the manual and diags have a logic diag which shows the start sequence
Stu

 

[pvb]

Thanks.... I have the manual and wiring diagrams

However it doesn't state, and i can't find online the start up process the unit goes through. This would help to see if the unit (airtonic) is going through its start procedure up before it detects the lack of fuel or pump.

If it's just a click great...I'll buy the pump and accessories
If it does more than a click before the pump/ fuel is detected as missing then my unit is faulty.

So really just curious if anybody knows the start up process/ diagnostics that the ecu goes through. Thanks

Sorry, I thought I'd answered that already. For clarity, the D2 Installation Manual I've seen says "The heater does not start up when the glow plug is defect or when the electric lead to the dosing pump is interrupted".