Help! I have been digging through many previous threads but am struggling to resolve my issue.

I have a no crank situation on my 2010 Focus 1.6 diesel. It has sporadically started in the past, and once running was fine, but now has stopped altogether. When turning to the ignition position I get a motor defect and transmission defect warning coming up on the display as well as a warning bing-bong-bing-bong-bing-bong from the dash.
From these forums I thought first it was the grounding points in the engine bay, so cleaned those up with no effect. Then I thought it might be the instrument cluster so had that reworked by a specialist. This also had no effect. I keep getting the same error codes as follows:-
ABS DTC U2202-E0 - Configuration Error
ABS DTC U1900-EO - CAN Communication Bus Fault - Receive Error
IC DTC U1900-60 - CAN communication bus fault
IC DTC C1750-60 - Accelerator Position Sensor Out of Range
IC DTC U2510-60 - CAN communication bus fault
Everything else is fine (in Forscan).

I have spent today trying to check the CAN line continuity but I am struggling to find all the right connector information to check all the lines.

I have also checked the OBDII port CAN line resistance - 60 Ohms across high and low CAN pins. I also checked the grounds on the ECU, which also seem fine.

What else should I look for?

I have been checking through the wiring diagrams that are on the website pages here and trying to find a solution but I am struggling to come up with a test method that might find a connector issue. I am considering whether it may be possible to build a CAN Wiring loom to connect PCM, ABS and Cluster together to see if that would solve the issue. Any thoughts?

Thanks

  

2 hours ago, NeilinBrussels said:

whether it may be possible to build a CAN Wiring loom to connect PCM, ABS and Cluster together to see if that would solve the issue. Any thoughts?

Hi Neil, "Not a chance" of you putting something together unless you have the resources and skills of a NASA engineer.

Have you taken the BCM (Body Control Module) out and checked it for signs of water. Take a very careful look at the plugs and sockets of all the pins in the connectors of the BCM. There is a known problem with water getting in and causing the sort of problems you are having.

The BCM is part of the fusebox in the passenger compartment. It will be located behind the glovebox. Disconnect the battery before working on the BCM. It is best to fully remove it so that you can give it a good inspection. Look for signs of greenish corrosion on any of the connector pins.

On my brother’s 1.8tdci 2008 focus I rewired the hs canbus from ecu to electric power steering pump to abs to obd connector to instrument cluster. All connections soldered as I wanted to make sure it was fine.  It did fix the problems on that car which had been plaguing us for a while.   I posted it all on here back in 2019. But I was getting inconsistent ohm readings on the hs canbus wires and trying this with various things disconnected lead me to think the problem was between the obd socket and the ecu. It was a while back so I might not have remembered every single detail.  When the car was playing up , so many times I said that’s it , I can’t fix it, but I didn’t want it to beat me and I kept going back to it to have another go.  18 months later the car was scrapped - we took it to the scrap metal crusher- as just about everything else had gone wrong, but the canbus problems never reappeared. 

On 1/17/2022 at 1:55 PM, unofix said:

Not a chance" of you putting something together unless you have the resources and skills of a NASA engineer.

I dont work for NASA but do have experience in automotive electronics as well as microelectronics and have even worked some on CAN components. I have quite a comprehensive set of tools to work on this. 🙂

from isetta I see that it has been done before so I will make up a loom and try that after I look more closely at the BCM. I took it out once but find no issue. What I did find is the plug on the A-post/sill taking wires to the rear of the vehicle had water damage. This I cleaned up but also dont think this should have an influence? Any advice on which other plugs to check?

I took out the BCM today and took it apart. No signs of any water ingress or damage. After reassembly I still have the same issue. 

Unless any more suggestions I will progress to the CAN rewire I suggested earlier.

Thanks

Purely out of interest, have you progressed any further solving this?

So. Progress update. I have rewired the HS CAN connections from PCM to IC including the ABS, steering and OBD connections as branches. The result is however the same!! Still I get the same fault codes as previously!! 

I must be missing something somewhere? I have checked the power and earths on the PCM connnectors and they seem fine and have cleaned up all the plugs on the HS circuit. I also got the cluster resoldered and checked out. Still it will not crank and gives me the engine fault and transmission fault on the display.

Any further suggestions are more than welcome as the next step is to scrap the car.

Neil

How well do you trust the IC repair done by the 'specialist'?  With those codes, it does look more like a fault with that than the wiring or the PCM to me.  I wonder if it would even be worth trying a used IC to test whether the same faults are still present like that?

Well the company did advertise as a specialist in instrument clusters and they gave it a clean bill of health. I will however see if I can find one on ebay that I can always resell if not the issue? Is there any vehicle specific coding to the unit or will any IC fit and work without reprogramming?

3 hours ago, NeilinBrussels said:

Well the company did advertise as a specialist in instrument clusters and they gave it a clean bill of health. I will however see if I can find one on ebay that I can always resell if not the issue? Is there any vehicle specific coding to the unit or will any IC fit and work without reprogramming?

They are vehicle specific and would need programming. Or swap the entire ECU kit out

As long as they're diesel clocks they should be fine.  Petrol ones are different.

Will need to programme the PATS but sounds like you're more than capable of using Forscan!

By this point you've got nothing to lose. If there's no possibility of voiding warranty on the repair to the clocks, open them up and check for cracked joints on the 32 pin connector to confirm if the company are fobbing you off.

You sure it's not a fuse somewhere? You say you've checked the BCM so if you're sure it's fine it can't be that. 

You previously mentioned damaged wiring along the a-post/sill, even though it may not be related it could be causing a dead short or intermittent short to ground somewhere that is either blowing a fuse or sending spurious currents through ground to confuse the CANbus network.

Even if that water damaged wiring is for the tail lights, they are controlled by the CANbus network so if there's something going on there it could wreak havoc somewhere you least expect it. Unlikely to be causing the major issue here but bear in mind

I checked all the fuses and cleaned up all the fuse contacts in the BCM. I also looked inside for water damage and there is no sign of water ingress at all.

For the rear connector, I am not sure that is now even connected as I remade the entire HS CAN network wiring and this was not part of it. I will check in the wiring diagram where it would connect to (maybe in the engine fusebox?).

I will perhaps remake the ground connection to the Engine ECU to see if that helps. As you say, there is little to lose at this stage!! I will also order a refurbed instrument cluster as I already checked the soldering and that seems to be okay (remade by the company that refurbed it).