Eberspacher fault

freebird1

freebird1

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Give me some ideas please...

Last weekend, Eberspacher D2 Airtronic was working fine (simple thermostat/switch controller). Yesterday, no....

Symptoms:
Switch on a controller. Usual red indicator light comes on.
Fan starts and builds to a high speed (normal).
Then nothing. No fuel pump activity.
So...
Battery fine 13+volts. Fuses fine.
Volt meter does not suggest that the glow plug has activated (ie a 10 amp drain not aparent)
Fuel fine. Ducting checked - all clear.
Wiring. Hmm. Checked at the blower and found the brown/white ground connection had come adrift (not an eberspacher wiring loom - made to fit boat - crimped connection had come apart). I can not be sure when though, but possibly during relaunch while being shaken about in hydraulic hoist.

Your thoughts?
Glow plug shot? Wiring fault has caused damage inside ebersacher?
I don't know how old the unit is nor what it's service history is like.
 
unlikely the glowplug given the wiring fault - I would check that I now had voltage and all other wires were firmly connected - after that I hate to say but would suspect internal damage as can be caused if earth comes off and current finds alternative route back to battery
 
Not sure if yours is the same but on mine there is a toggle switch which sets the system to heat and blow or just to blow ( I guess for sunnier climes when one wants to stir up the fug a bit )

In the past I have had minor panic attacks when someone has fiddled with the toggle and set it just to blow ( Its not that obvious which way is which ) - then you get air as if it were going to start but of course the fuel injector never kicks in

Hope you get it sorted soon
 
The ecu should check both the glow plug and the pump in the very early stages of switch on and will cut out if they are short or open circuited.
I dont understand the brown and white lead going to earth, is that the lead from the eber?
Which control switch is fitted? the little jobby with seperate heat and fan only buttons plus a heat setting knob or the older type square box unit ( which I thought was not fitted to D2s) ??
 
The white with brown stripe wire comes from the thermostat controller back to the eberspacher ECU (and then to ground, shown on the circuit diagram).

It is the square unit with a single on/off rocker switch and the inch diameter temperature dial, all fitted to the circuit diagram in the manual.

I don't have a toggle switch for cold only operation, although it did cross my mind that the fault could be at the thermostat end ie it is telling the eberspacher that it is satisfied. I wonder if this wire is the return from the temperature sensing wire. Losing that connection during, operation would then damage it?
 
The brown/white lead always seems to be associated with the temp control whatever the control system in use ( still cant see it going back to earth on my diagrams though the clour suggests that it may)
You can usually by-pass the thermostat side of things by connecting the yellow lead direct to red
 
I've got one doing almost exactly the same - if I connect yellow to red - it goes through whole startup process - glow plug is working as I can see the amps being used - and even get a whiff of smoke - but the fuel pump just doesn't tick.
Fan accelerates at increasing speed for serveral minutes - then seems to go through shutdown process.

Fuel pump works - you can manually tickle it to pump fuel into the unit - then if you start it up - it makes more smoke - but still doesn't tick the fuel pump.

Newish installation of a s/h unit - but has worked several times when testing. Launched the boat - worked one day - then the enxt day - nothing /forums/images/graemlins/mad.gif

Voltage at unit is fine - its as if its just not asking for fuel (tried 2 different pumps just to check) - but as others have said - without pump it won't go through start sequence

Not much help to you I know - except you are not alone ...
 
I am having almost identical problems with the D4 airtronic model; worked perfectly for about 3 weeks after re-launching the boat, then suddenly failed. Even more frustrating since I have recently fitted a new fuel pump and had the ECU replaced by Krueger (Eberspacher agents in New Milton).

Aim to have a go at fixing it this week, but removal of the heater unit (deep in the bowels of the stern locker) entails me balancing on my face, dislocating both shoulders and scrabbling around with a flexi-drive socket set and a mirror-on-a-stick.

Let me know if you solve your problem - problems with Eberspachers seem to generate far more posts than any of the alternative heaters.
 
Thanks for the ideas. I will by-pass the thermostat and see if that changes anything. My fuel pump is brand new, the blower is s/h. If that won't get it going, I suspect the ECU at fault and will be hunting a replacement. FYI, the fan runs for 4 minutes before shutting down according to the manual.
 
I've by-passed the thermostat - no change. I've now stripped dopwn the unit at home - no carbon build up anywhere, in fact I amazed how clean it is.

Resistance at glow pin is 0.001 ohms resistance. right or wrong?
 
put positive direct to the yellow wire and see if it fires, you are effectively by passing the controller. bad news is that there seems to be some history with the d2s and cpus going bad. they are v sensitive to lo voltage and if you have had a bad installation, i.e wrong cabling then they can be drawing too much current and it may screw them
stu
 
Some experience from a clunky old D1L so it may not be relevant to Airtronic D2 - but....

I had a problem very like this, and it turned out that the PCB track to internal warm air temperature sensor was cracked - easy solution which works better anyway was to fit an external temperature sensor and not use the internal one. (anyway you need to recirculate air from the cabin to the heater inlet to use a sensor inside the heater...

Now I would never have found this problem - I spent much head scratching - until I bought and hooked up one of the 7 day diagnostic controllers which can display a fault code - temperature sensor open circuit being a bit of a give away - about £50 from ebay if I remember.

Now if only I could ever find some time to fit the fixed Eberspacher to the boat instead of working all the time ... since I fixed and tested it last June... one day I'll get it going but visiting marinas and plugging in a fan heater has been a much simpler winter sailing heating solution so far...

Chris
 
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