more eberspacher woes

[alteredoutlook]

I have a 4 year old eberspacher D4 that's not behaving itself. After a winter of zero usage I decided to give it a treat by servicing it - dismantling, clean up and reassembly with new gaskets and a new glow plug screen. However its not working properly - if goes thro the process of starting (lots of smoke both black and white) but never producing the 'jet roar' of a well fired eberspacher. it eventually shuts itself down.

According to the fault codes shown on the 801 timer I have
F0 - 0
F1 - 52
F2 - 62

now according to my guide 52=safety time exceeded and 62=open circuit - potentiometer.

I have checked the wiring and all seems to be in place. Has anyone got any idea whats wrong?

Thanks in advance

 

[David2452]

Check the pot itself for open circuit, assuming you have checked the cabling and terminals already from the question.

 

[alteredoutlook]

Check the pot itself for open circuit, assuming you have checked the cabling and terminals already from the question.

I've just discovered this guide : http://www.t3-infos.de/images/Eberspaecher_Airtronic_D2_D4.pdf. This describes fault code 62 as
Potentiometer values outside of range on Thermostat (switch)
Check resistance between pins 6 and 7 at B1.
Resistance value for interruption between pins > 7175 W
Normal value: 1740 W - 2180 W (± 80 W )
If resistance value is O.K., replace control unit. If not replace thermostat/(
switch).


Q: is the 'control unit' referred to here, the main ECU i.e. the expensive one costing £300 ish......?