PATS and PCM diagnostics.

[Keithmac]

Hello everyone.

Just a quick question, I've been landed with a 2010 Transit Minibus to have a look at.

Just a quick question.

Even if PATS does not recognise the key, will the PCM still communicate with diagnostics?. I think it should.

I have FORSCAN and a VCM2 plus an ELM.

The local key company has managed to wipe the keys (hopefully I can recode with FORSCAN) but my main concern is lack of PCM comms.

Also I would presume PATS relearn would not be possible with no PCM comms?.

It's a bit of a disaster with a few good willed people doing the wrong things but I'm a bit peeved that the Key company have charged £120 and made a bad situation worse.

Thanks for your time, Keith.

[trnx]

Even if PATS does not recognise the key, will the PCM still communicate with diagnostics?. I think it should.

Is it logical to think that the PCM can be communicated with? Is it illogical to think that it cannot?
If the PATS cuts off power to the PCM then it is logical to think that it cannot be communicated with. Do you know that it is so?

On ride on mowers of the 80s there were switches on the seat, the handbrake, the deck position, the gear lever, the clutch, the whatever. If one of those switches was not made = no start. When the system was known and a non start occured it was logical to think one of the switches was not made. However if all the switches were made then it'd likely be a broken wire/poor electric connection. A person could see and feel the switches etc.

Electronics a person cannot see or feel the state of the electronics. Electonics there's a variety of ways of achieving a state - be it logical or illogical.

How does the PATS prevent the engine from starting?

Where's the info' re' the required knowledge?

Might fiind some clues watching youtube vids by RMS, Diagnosticdan etc etc.

[Keithmac]

They originally had Immobiliser flash code 16 which from what a can find is lack of communication to the PCM?.

I believe either the BCM or Instrument panel send a signal via CanBus or LIN to the PCM to authorise start and that it is not a hard power cut to the PCM.

That is why I posted to see kf anyone on here could verify basic PCM comms should be available with no coded key.

I have a limited time on Sunday to have a look for them so just gathering information at the moment.

Something has happened, possible damage from attempted jump.starting so I need clear path to follow and verify the PCM has not been damaged.

[Airthies]

Are you getting any coms via Forscan?

Does it read the vehicle and have fault codes?

Normally You should see:
PCM - powertrain control module
BCMII - body control module
IPC - instrument control module
ABS - antilock brake system
RCM - restraint control module
(Possibly others depending on vehicle spe)

In the connection log of Forscan it will show if any or none have responded and connected.

Fault codes will show if any modules are not communicating.

Pats is based in the BCM

When coding keys Ensure you're using genuine as many aftermarket will often not code with the system, they tend to be clones rather than independent active keys and the system will not recognise them.



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[Keithmac]

Hello, FORScan would not connect but I managed to force connection using another vehicle profile.

Both ABS and BCM have faults relating to lack of communication with the PCM.

My first step is to verify correct power and grounds to the PCM.

The PATS issue has thrown a spanner in the works unfortunately, made my job a bit more difficult..

So to sun up there is no comms at all with PCM, I can talk to BCM and ABS unit with FORScan (but it's not able to communicate with PCM).

The mileage display is also blank.

I'd just like to confirm the ability to communicate with PCM with uncoded keys before I sink time into fault finding, wiring / relay testing etc.

[trnx]

The mileage display is also blank. Seen that a few times on the internet - could be - Pine Hollow diagnostics - he finds green crusties.


ford transit Mk7 mileage display blank - put in google search =.
AI
A blank mileage display on a Ford Transit Mk7 is
usually caused by a failed instrument cluster (requiring repair/resoldering), blown dashboard fuses, or a faulty ABS sensor. Check fuses first, then inspect the front ABS sensor/wiring, or consider having the instrument cluster professionally repaired.

There's more.

It is noted that several DTCs can be sorted by fixing one of the DTCs. The modules are linked - one affects others -.
Often seen - low V A from front battery being the cause of multiple DTCs.
Key transmitter reciever - battery if it has one - defective unit(s). Starter key rotary switch.

In google search - ford transit mk 7 not able to communicate with PCM

AI.
A Ford Transit Mk7 (2006-2014) that cannot communicate with the
PCM (Powertrain Control Module) often stems from a lack of power/ground to the module, a faulty ignition switch, or corrosion in the fuse box (especially passenger footwell/engine bay). Common fixes include replacing the ignition switch, checking fuses (specifically PCM), or inspecting the CAN bus wiring for damage

Could be there are earths under the PCM. Was a vid re water damage dripping down to the PCM causing rust and lack of earth contact.

[Keithmac]

Thanks for the replies.

Had a look today, verified CanBus integrity and power / grounds etc.

PCM has the electrical smell off doom unfortunately.

[Keithmac]

I think this was caused by attempted Jump Starting unfortunately. has anyone else seen similar?.

20260302_190031.jpg

[MinorMatt]

People have reported blown PCMs and other things from jump starting with the wrong polarity.

What is the van you are attempting to do the work on? I have a matching BCM and PCM from a 2006 130PS 2.2 available (it also comes with the high level cluster and leather steering wheel with cruise switches etc)