[Engine] Bsi fault no start unless plugged in at obd

[DonnyNathan]

Hi first post here, iv recently bought a 2004 1.9d berlingo I'm having trouble with the bsi fault codes I get read no communication ecu, all the dash and wipers ect flashing and going mad and it cranks but no start if I plug my autel maxi com into the obd and try read bsi it fails but the dash goes back to normal and the van starts as soon as obd is removed no start and mad dashboard again, can anyone suggest anything or come have a look for me I'm in Doncaster  thank you

[Multispacer]

Hi first post here, iv recently bought a 2004 1.9d berlingo I'm having trouble with the bsi fault codes I get read no communication ecu, all the dash and wipers ect flashing and going mad and it cranks but no start if I plug my autel maxi com into the obd and try read bsi it fails but the dash goes back to normal and the van starts as soon as obd is removed no start and mad dashboard again, can anyone suggest anything or come have a look for me I'm in Doncaster  thank you

Have you carried out the BSI reset procedure, which can cure many of the type problems you list?

If you have already tried that to no avail, the next port of call would be checking the engine bay fuse box which is adjacent to the battery. This is not only a fuse box but also contains a load of electronic circuitry that communicates with the BSI. These are well known to cause all sorts or weird random problems [like you are describing] if they get liquid damage. This is normally from water, as because of a bit a design fault on a number of PSA group vehicles if the scuttle drains at the corners of the engine bay [under the wiper scuttle area] get blocked with leaves and other debris, rainwater has nowhere to go and then pours into the engine bay and onto the engine bay fuse box. In my case the wipers and headlamps would switch on randomly when the vehicle was parked up with the ignition off!! I also had random warning lights appearing on the dash.
If it is the box at fault, the electronics on the underside are all 'potted in' and the only thing you can do is replace the whole fuse box/electronic unit. The good news is they are easy to replace and do not need any coding. I got a used replacement for less than £40 delivered in my case. If you do go down the replacement road, make sure you get the EXACT same part number as they are used on numerous PSA group vehicles and they are not interchangeable even though they might look the same.
The way  to check if you box has been subjected to water damage. Disconnect the battery and wait the required time for all the systems to go into sleep mode. Remove the cover to the engine bay fuse box and in turn, pull out and check each blade fuse in turn, clean with electrical contact cleaner and refit . If you've had water damage you will see that some of the fuse blades will be corroded. Sometime you get lucky and just by cleaning them you clear the faults but on most occasions the damage is to the actual electronics on the base of the unit and replacement is the only option. 
If you do find you engine bay fuse/electronics box damaged by liquid make sure you then check and clear the scuttle drains as if blocked it will happen again.

[DonnyNathan]

Thanks for the reply iv done all that you said still no luck if it helps it all seems to of started when I got condensation Inside all the windows where wet and the car wouldn't unlock or do anything I got in by the key in lock and all the dash was going crazy iv checked the bsi inside seems ok to me but I can't check on obd as it doesn't read and just get code u0028 even though it doesn't read the dash goes back to normal and can drive all day perfect until unplug the diagnostic computer which is strange so I'm lost on we're to go from here

[DonnyNathan]

I was hoping there would be someone on here nearby doncaster that can diagnose the problem or I could travel too them maybe