Wiring 406 coupe

[Lighty]

A little help required from any electricians please
The car is an 03 Pug 406 coupe with a 2.2 diesel and Bosch EDC 15 ecu. It is blowing fuse F8 in the underbonnet board, this is for "engine management". I have traced the fault down to two white wires from the board that appear to go straight to the ECU to pins C3 &B4. The wire numbers seem to be CMO4A and maybe 1763 (hard to read). I currently have no wiring diagrams and no electrician, so any help would be gratefully received

[wheeler]

Is it full multiplexed (with COM2000) ?

[Lighty]

Yes the car has comms 2000 & is multiplexed

[wheeler]

Im trying to cross reference this with a C5 diagram as i dont have any peugeot ones. What is the connector colour & pin numbers on the under bonnet fusebox where the wires come out & you say pins C3 & B4 at the ECU ? what colour connector ? the black, brown or grey ?
Can you double check the wire numbers as so far im havin no luck finding them, if the numer is not very clear strip the tape back a bit further as the numer is printed all the way along the wire.

[spider]

I'll see if I can find a diagram later as I don't have access at the moment to check.

[Lighty]

Ok guys , the problem wire is CMO4F, the other no is a 1732, which refers to it being white I guess as its on the other white wire. The other one is 9006 which goes to the DLC connector & isn't used


Ecu pic




Fuse box

[wheeler]

CM04A appears to go straight from pin 12 of the 16 way green connector straight to pin C3 of the 32 way grey connector, try disconnecting it at both ends & see if it has continuity to earth.
As far as 1732 goes i cant find any reference to it on the injection system wiring diagram (from autodata). Where is this wire ? What component, connector colour & pin number ?