Fixing the BA PCM/ECU 'wont start cold' issue

[ValleyKing]

I recently encountered the apparently common issue where the engine won't catch if the temperature is under 15C. After warming the ECU with a heat gun it starts normally and everything runs fine, so problem identified. Notched the cover bolts with an angle grinder and unscrewed them so it is ready for a swapover. Bought a cheap second hand replacement ECU from another unspecified 4sp Petrol Barra.

 

Now the problem with this approach (apart from the surprisingly expensive recoding) is that part is also 20 years old and may easily develop the same problem. I feel I have enough electronics skills to fix a cracked connection on a circuit board but tracking it down without a circuit diagram might be tricky.

 

Does anyone have a full circuit diagram of the PCM/ECU?

[k31th]

Ford Forums keeps a copy of all workshop manuals and diagrams like that (go to "Powertrain" here):

https://fordforums.com.au/vbportal/viewarticle.php?articleid=828

[ValleyKing]

"you do not have permission to access this page"... Could someone post the relevant data here please

Edited 15/06/25 03:54 AM by ValleyKing
needed to add request

[k31th]

Of course you'll need to be logged in over there to be able to view it

 

[ValleyKing]

It would be really helpful if you are able to just post it here, or have another location to find it, as opposed to waiting around for their administrator to approve my account and hope that it isn't locked to certain privileged members only

[ValleyKing]

"ValleyKing, you do not have permission to access this page. This could be due to one of several reasons:

1. Your user account may not have sufficient privileges to access this page"

Wild that you can have that information, claim to be a place that is about helping people, and deliberately choose not to share it. Most unAustralian thing I've seen in years

[k31th]

I understand your point; but I'm not going to take their stuff and post it here, as they add a watermark saying it's from them... I have a copy of the BF one, but confirmed it's different to their BA one, so it's not useful to you...

I definitely don't have any special privileges over there, either... just a standard account that's been on there for many years

[ValleyKing]

Equally that information is the intellectual property of the Ford motor company. They can't just watermark it and claim it as their own. If they are directly or indirectly selling access to it, that's super illegal. If you're not comfortable posting it you could email it to me

[k31th]

I believe they've done that because they purchased them legitimately and it already had their identifier on the PDF they got so they added the watermark to specify that... but I don't run that place so it's not my concern what they do, whether illegal or legal.

Just wait for your account to be approved; shouldn't take too long.

[ValleyKing]

Would you mind posting your BF schematic? I have a copy of the pinout differences between the BA/BF so I can probably work it out from there