OM642 V6 powered Chrysler 300.

[brynv6]

Hello. Wondering if anyone in this Mercedes club might be able to help me with my problem.
The car is a Chrysler 300, Dec 2006 with 66700 miles and in very good condition.
My problem started three days before " lockdown ". Was returning home and going round a roundabout, the car suddenly cutout, I thought it was a fuel problem because tank was showing just above a quarter, so tried to restart. It started ok but only got to 1000 revs before cutting out again, tried this several times but no luck. I abandoned the car on the roundabout - hazards on and went to get fuel. Returned to find car still in one piece! Put fuel in and tried again, still same problem, only goes to 1000 revs.
Myself and two passersby helped push the car off the roundabout down a side road.
I then contacted RAC, they eventually responded by sending a technician to sort the problem.
He attached RAC OBD computer to read DTC codes, codes came back as:-
PO201, 202 and 203, being injectors cylinder1, 2 and 3. Also codes
PO676, 675, 674, 673 and 672, glow plug circuits.
The car now lays on the drive unable to start, it doesn't attempt to fire at all now, not even to 1000 revs.
So start testing fuel supply from tank to high pressure pump, which was ok. Then thought that pump shaft/drive might have sheared, so removed pump, seemed ok. Replaced pump and tested again, fuel is being delivered to high pressure rails and to top of injector.
So it would seem to be electrical supply to the injectors, as per RAC DTC codes. But why only three cylinders and if 4, 5 and 6 were still ok why doesn't it start on those, even though would be rough running.
Sorry for this long winded email, but it does explain the situation and problem.
So I'm wondering if anyone out there has any idea what the problem could be, thanks,
Brynv6.

 

[Doug1234]

I have a Jeep grand cherokee with same engine and these can suffer from wiring harness chafing on air conditioning pipes that run beside oil filter housing.
Ecu’s and fuse boxes are at front on cars passenger side on these and main wiring harness to engine crosses over here and will eventually rub away on hot aircon pipes , harness can be lifted up and secured with cable tie to prevent this happening.
Your 300c may not have same layout but its worth a look.

 

[DREAMER NO2]

Sorry to say but Jeep as been electrical prone for years .Why dont the makers sort it out for good .

 

[Doug1234]

This cable will only rub once the engine mounts start to go bad , haven't had anything go bad with mine but the fuse boxes have all been doused down with Acf-50 as a precaution simply because all fuse boxes are open underneath to let them drain water if you drive through the odd river or two

 

[alexanderfoti]

Don't know about Chrysler, but lots of MB's wont start at all if the injectors (1 or more ) are open circuit. Considering your injector codes, I think that the issue lies with the loom somewhere.

 

[Doug1234]

Check starter cable as below
http://www.wkjeeps.com/misc/LX/TSB_300C_Forums/Rapid_Response_09052a.pdf

Check ASD fuse to see if blown (auto shut down relay ) it will blow if anything goes bad like swirl flap motor or any wiring harness trouble ,when it does blow then the auto start by flicking ignition key on and instantly releasing will not work and the starter will just keep cranking engine until you turn key off manually.

This is the part of the harness that rubs through, your 300 is the same layout as a Jeep as far as wiring harness goes for the om642 engine
https://www.jeepforum.com/forum/f67/diesel-wont-crank-repair-p0615-4195650/

 

[brynv6]

Hello and thank you Doug1234, Dreamerno2 and Alexanderfoti.
I shall attempt to have a good look in the engine compartment for any suspect wiring problems. Trouble is the car was just dumped on the drive the night it broke down and is awkward to get around one side. I shall have to jack the vehicle up and try to move it so I can get down the nearside of the engine compartment for better observation. I will try to use an optoscope to see down in the sides of the engine, it really is packed in there very tight.
Doug1234, is the ASD fuse in the main fuse box and how will I recognise it?
Thanks to all of you chaps that have responded in trying to help with my problem, also apologies for being a little late in acknowledgement, thanks once again,
Brynv6.

 

[Doug1234]

https://www.autogenius.info/chrysler-300-2006-2007-fuse-box-diagram/

Fuse number 11 (20amp) in fuse box under bonnet

 

[Wighty]

Hello and thank you Doug1234, Dreamerno2 and Alexanderfoti.
I shall attempt to have a good look in the engine compartment for any suspect wiring problems. Trouble is the car was just dumped on the drive the night it broke down and is awkward to get around one side. I shall have to jack the vehicle up and try to move it so I can get down the nearside of the engine compartment for better observation. I will try to use an optoscope to see down in the sides of the engine, it really is packed in there very tight.
Doug1234, is the ASD fuse in the main fuse box and how will I recognise it?
Thanks to all of you chaps that have responded in trying to help with my problem, also apologies for being a little late in acknowledgement, thanks once again,
Brynv6.

Have you tried the Jeep forums as well buddy ?