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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > BMW Coding > DDE Diesel Electronics modules



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      01-07-2013, 04:58 PM   #1
coopersim
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DDE Diesel Electronics modules

I've had a rough idle at start-up issue for a while now, I've got the codes off the car, and it's showing:

4252 DDE: Glow plug, cylinder 5, activation - Open Circuit - Fault currently present - fault would......... (then it goes off the edge of the screen)

Would one faulty glow plug cause such uneven idling?

Also, I can't seem to access any of the three DDE Diesel Electronic modules listed in DIS to be able to interrogate the system further, any idea why this is?
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      01-07-2013, 06:42 PM   #2
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Faulty glow plugs can cause uneven idling but only for a few seconds after cold start.
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      01-07-2013, 06:50 PM   #3
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Only one out of 6 though?
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      01-07-2013, 07:19 PM   #4
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Yes. Just like 1 faulty spark plug can cause a rough idle or misfire for gassers.
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      01-07-2013, 08:47 PM   #5
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Quote:
Originally Posted by Grant@DetailAddict
Yes. Just like 1 faulty spark plug can cause a rough idle or misfire for gassers.
But unlike spark plugs which are constantly being ran when vehicle is on, glow plugs are only used to heat up the chamber and then not used again until you re turn on a cold car. So a bad glow plug will cause even idle ing but only until fully warmed
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      01-08-2013, 12:38 PM   #6
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I understand that.
I was equating how just one can cause the idle to be rough just like only 1 spark plug can do that to gassers.
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      01-08-2013, 03:29 PM   #7
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you would hardly notice 1 bad glow plug. Even with 3/6 glow plugs malfunctioning your car could start perfectly up to ~-15C
My older E46 had busted relay (so 4/4 glow plugs were not working), and at ~-20C it would crank ~3 sec more.

if you have rough idle, then look more to injectors and air intake

you might be needing ICOM or ICOM emulator to access DDE with ISID
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