Transit 2010 minibus 2.2 85kw Throttle dropping out

[Loopylisa]

Hi everyone, I have a problem with my transit minibus. Bit of history first.
We had a clutch and flywheel replaced in October last year then again last week. No other problems at this point. The garage has called me to say that the clutch is all done , but on road test he found that at 50mph the throttle stopped working, he lifted his foot and it worked again for a couple of mins then back to being limited to 50mph. Took it back to the garage and plugged it in got a fault code for EGR. Blanked of the EGR and tested again still the same. No lights or warning from the start. Can anyone point me in the general direction of what maybe wrong please....

[Loopylisa]

Ok so we have a bit of an update.
The garage has basically given up. They say they have checked everything and think it's a BCU. But have no proof that it is that. I am loathed to replace this part willynilly. Without some solid proof. I have found some info that would be good to do before changing a 1000€ part.
The problem is now worse than it was. We drove it back from the garage with the intention of taking it to the ford agent. It revs to 1500rpm then drops to 0. Lift foot of accelerator and back on and it revs to 1500rpm and happens again. The problem is there all the time, it still has no lights on and no codes. I did see a YouTube about fuel temp sensor that may be the fault so that's my next stop before spending €€€€,000s at he ford dealer. Does anyone have any other ideas please

[metalworker0]

Don't you mean PCU - Power Control Module ..the BCU is the Body Control Module.
I would be looking at the accelerator pedal itself ..as this an electronic throttle with no cable.

You have to have diagnostic scanner or a pc laptop to complete the next steps to find out if it even is the accelerator though.
it is possible with a mobile -- i cant tell you about that as I'm not familiar with mobiles for this.
They recommend "Forscan" which is free software that you download to a laptop..you buy the interface cable
You must join the forscan forum ..again free, to get the software and more answers.

Once you have it set up.
You will be going to the live date section of the program and looking at accelerator position percentages.

https://forscan.org/forum/

Sorry that's the only way you are going with this, is to learn how to use forscan
From this forum here you will be taking instruction on what to look at, which may be many other things other than the accelerator .....reporting back here the values you see, then hopefully someone can come up with an answer.

Sorry this is the only road you can go down with this problem.
Unless someone here has had exactly the same problem and they know the cause.

all the best.mark

[knobby1]

Don't you mean PCU - Power Control Module ..the BCU is the Body Control Module.
I would be looking at the accelerator pedal itself ..as this an electronic throttle with no cable.

It's actually "PCM", (Powertrain Control Module)...and BCM, (Body Contol Module).

Lord Knobrot

[metalworker0]

yeah i know ..sort of confusing to my brain, when all my life, i learnt the letters ECU, when these things first came about

all the best.mark

[knobby1]

yeah i know ..sort of confusing to my brain, when all my life, i learnt the letters ECU, when these things first came about

all the best.mark

Understood...most older vehicles which have fuel injection use an "ECU" or Electronic Control Unit. More moderm vehicles have several modules to do different things, PCM, BCM, RCM, ABSM etc..etc..Usually all talking to each other and connected via Can-Bus. The Mk7 was the first Transit to use a simple Can-Bus system, The Mk6 does not use Can-Bus.

Lord Knobrot

[Loopylisa]

Hi all a bit of an update on the minibus, We took the minibus to another garage that popped it on the tester and found that there was a brake light fault logged and the battery was only 43% efficient so battery replaced , no difference, got the brake switch today and fitted it and r problem went away, refitted the old part and it came back. So just got to get it put back on the diags stem to have the brake light switch programmed in to get brake lights working and finger crossed it's fixed if not it will be a BCU. I'll let you know when I get it done later this week. Why oh why it would be a brake lights switch I've no idea but pleased if it is.

[metalworker0]

Sorry I'm lost in the world of modern electronics , i don't understand how a brake light switch has to be programmed, and don't understand how a brake light switch would make the throttle drop out, hope i never have to own such a vehicle .

Unless dead short on it pulls all the power from BCM and that in turn shuts down PCM -- but that still doesn't make sense, as a fuse should have blown first, ..so i think you have the wrong amperage of fuse fitted somewhere. and that fuse blowing would have told you in the first instance that there was a fault with the brake light. and then non of this would have happened.


all the best.mark

[Altransit]

Sorry I'm lost in the world of modern electronics , i don't understand how a brake light switch has to be programmed, and don't understand how a brake light switch would make the throttle drop out, hope i never have to own such a vehicle .

Unless dead short on it pulls all the power from BCM and that in turn shuts down PCM -- but that still doesn't make sense, as a fuse should have blown first, ..so i think you have the wrong amperage of fuse fitted somewhere. and that fuse blowing would have told you in the first instance that there was a fault with the brake light. and then non of this would have happened.

I can't pretend to know all the ins and outs of modern vehicle electronics, but I have learned that the BCM is capable of dealing with all sorts of electrical faults without blowing any fuses. For instance, I had a short circuit in an indicator light wire, which stopped all indicators on one side from working. The minute that the fault was found (and the screw removed from the wire!), everything worked again, without replacing any fuses. It makes conventional fault finding a nightmare