Access to PSA servers with diagbox

[GiveMeABreak]

It needs getting onto Diagbox and providing us the codes Stuart. There will be faults logged and we really need those to help identify the issue.

[Stuart W]

Thanks Marc.the current diagbox faults mainly relate to comms errors.
ABS
U1108 87 no comms with engine ECU
U2508 87 software not compatible with Engine
ECU
Both faults temporary and local

EDC17C60 ENGINE ECU
U04I7 00 comms error with ABS ECU
U1113 87 " " "
U0121 87 " " "
U1118 87 comms fault with BSI
U1121 87 comm fault with power steering
U11DD 87 comms fault with voltage maintaining device
U1118 87 comms fault with BSI
U2000 06 Remote triggering line fault
U0073 88 intersystems CAN
All shown as permanent except voltage maintaining device and all distant
If I clear the faults the car will run normally for a random length of time minutes or weeks before the same errors re occur. The faults look like the Engine ecu is the culprit but since the abs has just been replaced and re programmed I am aldo suspicious of the software mismatch message.

[Stuart W]

I currently have a host of diagbox fault codes, almost all with the suffix 87.Does anyone know what this refers to?

[H4wkeye]

Post the codes that you get here and we can figure it out.

[Stuart W]

Thanks.If you look at my last post "Access to PSA servers with diagbox" 17th June , my last posting has the most relevant codes which refer to comms faults betwern Engine ECU, ABS and BSI.Most of them end with 87.

[Stuart W]

I have given up trying to find what the extended diagbox error codes mean and am going to try a replacement cloned ecu.Whether it works or not it will at least remove one more item from the suspect list.This car (GP blue hdi exclusive) was so good when it worked but after 7 months off the road with endless electrical issues the scrapyard is looking like a next move for a low mileage car that cost nearly £10,000 just over a year ago.

[GiveMeABreak]

I've merged these two topics so as not to conflate the issues and avoid duplication - I will not look at these codes Stuart. I must of missed the last topic update regarding the codes I asked for. Leave it with me for a bit...

[Huskyxantia]

Is your fuse box ok ?

[GiveMeABreak]

Thanks Marc.the current diagbox faults mainly relate to comms errors.
ABS
U1108 87 no comms with engine ECU
U2508 87 software not compatible with Engine
ECU
Both faults temporary and local

EDC17C60 ENGINE ECU
U04I7 00 comms error with ABS ECU
U1113 87 " " "
U0121 87 " " "
U1118 87 comms fault with BSI
U1121 87 comm fault with power steering
U11DD 87 comms fault with voltage maintaining device
U1118 87 comms fault with BSI
U2000 06 Remote triggering line fault
U0073 88 intersystems CAN
All shown as permanent except voltage maintaining device and all distant
If I clear the faults the car will run normally for a random length of time minutes or weeks before the same errors re occur. The faults look like the Engine ecu is the culprit but since the abs has just been replaced and re programmed I am aldo suspicious of the software mismatch message.

I don't have a lot of data on this specific engine management system, but from the looks of things it stems from only a few causes. Ignore all the associated warnings as this is to be expected, considering systems are interlinked and they depend on talking to each other. So if there is simply no dialogue it is going to prevent systems from working or at least downgrade them.

Several key things of note here - a problem with software compatibility and / or mis-configuration of the engine ECU. This can be caused by the incorrect software applied (or attempt to apply it which can leave it in non-functional state). There are occasions where it can take 2-3 times for a software update to download correctly which is also acknowledged by Citroen. Or the engine ECU can be incorrectly configured as a result of a failed or incorrect download.

Or it can be a fault on the engine ECU itself or the comms data network which links all the systems together.

Given that you have the one explicit fault code that points to the software compatibility directly and a further point I have noted at U1113 87 regarding Engine management ECU mis-configuration, I think that has to be the place to start.

Given the nature of these issues, and if it were me, I would be biting the bullet and taking it to my dealer. For the sake of a few hundred quid in diagnostic time and a correct download of the engine management software which would be included, that has to be the place to start and considering they would also have access to all the testing kit for the CAN.

Suspects: in brackets ()
U1118 87 - (Built-in systems interface, Connectors, Intersystems CAN)
U1113 87 - ABS/ESP ECU (CAN): Missing information (CAN, Configuration of the engine management ECU, Fuses, Connector, Electrical harness, ABS/ESP ECU)
U0121 87 - Communication with the power steering ECU: No signal (Electric power steering, ABS/ESP ECU, Connectors, Intersystems CAN)
U11DD 87 - (No info)
U2000 06 - (No info)
U0073 88 - Intersystems CAN: CAN in error ( Engine management ECU, Intersystems CAN, Electrical harness, Connectors)

Fault Code:	U0073 88
Description of Fault:	Intersystems CAN: CAN in error. Communication fault on intersystems CAN network: CAN bus absent.
Conditions for Fault to clear:	The following conditions have to be met - After switching the ignition off and then back on - When driving
Downgrade Modes whilst Fault is active:	Inhibiting of the injectors reset strategy Sending of the information "torque uncertain" on the CAN network
Symptoms:	Engine hesitating, cutting out Starting problem
Suspect Areas:	Engine management ECU Intersystems CAN Electrical harness Connectors

[Stuart W]

Thanks Marc.It was following 1 and a half hours of being on the main dealer's computer for reprogramming the replacement ABS unit that these faults first started but they are so very intermittent.Initially the car ran fine for 3 weeks before any faults came up but they can return at any time .I suspect that the fault, whatever it is , is only occurring for a millisecond.Enough to cause a data error but not permanent enough to show when we check the individual suspect items.The BSI was sent away for checking.The ABS has been replaced and re programmed as mentioned and the voltage maintaining device /bolt in fuse distribution unit replaced. I may as well clone the ECU as I have sourced a suitable replacement.I have been trying to get a Main dealer to take it to but none will commit to giving me a worst case maximum cost.They just say bring it in and we will put it on the diagbox.Most do not even return my call.They must have an idea of what the worst case scenario would cost!

[GiveMeABreak]

I suspect that if one or more ECUs has already been updated then it may not have taken - Citroen do say this can take several attempts. Further, it can also mean the engine ECU may also be in need of an update - but I would of expected a decent dealer to check all this at the time.