[stuntmaneddie]

Hi All

New to the Forum, been reading as a guest for a while though, great place.

I have a MK7 Zetec S tdci, which now has electrical issues it seems. Immobiliser flashes code 16, which i believe means
no power to PCM. Weirdly, when i tried to pull the relays to check them, as i squeezed with grips to remove the starter
relay to get it out, car tried to turn over (without keys in ignition). Does this mean i have power to fuse box, but
fuel pump/glow plugs/etc are being held off by something ? Lack of power to put all relays and PCM into normal state
to operate?
Can't seem to even locate anywhere i could get a wiring diagram from, and i believe Haynes manuals no longer cover these ?

Any help appreciated, before i burn the things
Thanks
Stuntmaneddie

 

[Mondygeek]

Have you tried a different relay in the one that turned the engine over?

 

[Mondygeek]

I had the same problem. In my case it was the multiplug for the main engine harness located on the front of the gearbox. You'll need to remove battery tray to access it and do a continuity test on all the wires either side of the plug

 

[stuntmaneddie]

Have you tried a different relay in the one that turned the engine over?

Yes mate, swapped a few of them, no change.
Definitely seems like a power supply issue to all relays, as fan one does the same. Seems that squeezing them is enough to make them contacts of the high current side

 

[stuntmaneddie]

I had the same problem. In my case it was the multiplug for the main engine harness located on the front of the gearbox. You'll need to remove battery tray to access it and do a continuity test on all the wires either side of the plug

Ok, i can have a look at that, thanks. I have also read bad earth points can be a cause. Anyone know if Ford dealers
will supply wiring diagrams for older cars ?

 

[Mondygeek]

Finally a new car!

I'll start from the start. I'd worked a night shift, went to sleep the following day and woke up to a text from a colleague.... Hi ben. Dr *****'s wifes car (2009 fiesta automatic with only 21000 miles on clock) was towed to Ford dealers after not starting. Ford say it could be the immobiliser...

www.talkford.com

Have a read through my thread from the troubles I had with mine.

 

[stuntmaneddie]

Finally a new car!

I'll start from the start. I'd worked a night shift, went to sleep the following day and woke up to a text from a colleague.... Hi ben. Dr *****'s wifes car (2009 fiesta automatic with only 21000 miles on clock) was towed to Ford dealers after not starting. Ford say it could be the immobiliser...

www.talkford.com

Have a read through my thread from the troubles I had with mine.

Thanks for that, sounds exactly the issue i have. Will start testing continuity, guess i wm stripping the loom bqck

 

[Mondygeek]

Thanks for that, sounds exactly the issue i have. Will start testing continuity, guess i wm stripping the loom bqck

Not much of the loom needs to be stripped back either side of that plug. Getting the contact to the wire itself is a bit tricky, I used a clothes hanging peg and drilled a tiny hole in it, clip the peg on the individual wire and pop a needle into the drilled hole and then touch the multimeter on the needle

 

[Mondygeek]

kweiny Electronic Wire Piercing Probe Clip 2 Pack for Automotive Diagnostic Tester Tool : Amazon.co.uk: Automotive

Buy kweiny Electronic Wire Piercing Probe Clip 2 Pack for Automotive Diagnostic Tester Tool at Amazon UK. Free delivery on eligible orders.

www.amazon.co.uk

Or something like this would work

 

[Mondygeek]

Make sure you keep us updated every step 👌🏻

 

[stuntmaneddie]

Make sure you keep us updated every step 👌🏻

Thanks for all the advice, have a wiring diagram coming, so will keep the post updated

 

[Mondygeek]

Oooh that's good! I think from memory the wire came from fuse 27 through the loom Into multiplug.
The pcm has I think 3 power feeds so a diagram will definitely help you find them. If you struggle to understand the diagram post a few pictures on here

 

[Mondygeek]

Any joy?

 

[stuntmaneddie]

Any joy?

Thread update - Problem gone!

Well, when i say gone, the car is gone. Tried tracing wires, testing continuity, cleaning and reseating all multi-plugs for the main loom, cluster, CanBus, etc......no change. So, had enough of it, and sold it as it was. Shame, as it was a good car, but it was just getting to point where i was frustrated so cut my losses.

Thanks for all the advice along the way though

 

[Mondygeek]

Sorry its got to that stage very frustrating tracing a wiring fault that takes shear determination