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Citroen C4 1.6 NFU 2006 - Non start - Fixed #

Posted by Ian Butler on February 10, 2011, 9:20 pm

Year of Manufacture *: 2006
Engine Size and Code *: 1.6 NFU
( Optional ) Scanner Used: Lexia 3

Anyone had any problems with a c4 nonstarter flagging injector control module faults(short to -)
Having followed 'citroen service' faults trees and incorrectly replaced the ecu it would now appear to be a possible fault with the multifunction control unit in the engine bay fuse box area, Has anyone had the need to replace one of these. Thanks in anticipation, regards Ian

Re: Citroen C4 1.6 NFU 2006 - Non start #

Posted by martin simonsohn <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat3223' width='330' height='300' border=0 style='border:none;'> on February 11, 2011, 4:04 pm, in reply to "Citroen C4 1.6 NFU 2006 - Non start #"
Martin Simonsohn

hi taking a quick look at the wiring diagram for this system it looks like the mfu supplies the injectors coil pack and the o2 sensor heaters for both up and down steam sensors.
i would say its worth testing the supply from the mfu to above mentioned circits and the ecu grounds.
would also scope both the traces and the current for the coil pack to be sure the coil isn't kicking the ecu in the pants with a miss fire.
also current ramping the injectors to see what they are doing
hope this helps

Fixed #

Posted by Ian Butler on February 11, 2011, 5:15 pm, in reply to "Re: Citroen C4 1.6 NFU 2006 - Non start #"
Message modified by board administrator September 16, 2011, 8:57 am

Many thanks for your input.Ive now sorted the problem.Yes it was as suspected the MFU pulling the injector feeds and also fuel pump feed. As a matter of interest where did you source the wiring info from?
Regards Ian

Re: Citroen C4 1.6 NFU 2006 - Non start #

Posted by martin simonsohn <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat3223' width='330' height='300' border=0 style='border:none;'> on February 12, 2011, 12:58 am, in reply to "Re: Citroen C4 1.6 NFU 2006 - Non start #"
Martin Simonsohn

hi i got the data from autodata program full program with wiring info
not bad but has rather alot of holes (missing info) dont think ant of them cover all but do like autodata wiring diagrams easy on the eye

Re: Citroen C4 1.6 NFU 2006 - Non start #

Posted by Colin Bunn <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT2569' width='330' height='300' border=0 style='border:none;'> on September 8, 2011, 11:12 pm, in reply to "Re: Citroen C4 1.6 NFU 2006 - Non start #"

Hello Ian
Is the MFU the fuse box in the engine bay?or the bsi in the glovebox?I have the same issue with a C4 55 plate.1,2,3 and 4 injector fault plus purge canister short.Fault seems to be in engine bay fuse box.

cheers

colin

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