Hi everyone
A big thanks to everyone who tried to help with engine control module no communication
After around 3 months of trying to sort this out
I have finally made the hard decision to crush the car
after not being able to find out why i have no power to passenger compartment fuse 1 engine control module/ crankshaft sensor and to engine compartment fuse box fuse 18
so once again thank you
Kind regards
Darrol

I really feel for you - but why not part it out and help some other Jag owners?

I'd recommend to hold off on that idea...
Soon you are going back to the UK, where the S-Type was born.
Who knows - maybe you coincidentally meet someone there, who knows, how to solve the problem.

There was someone by the name of Ian Moss or Roger Moss or something. He was basically a "car-thief" on the payroll of Jaguar (around 1998): It was his job to test, how long it takes to nick any specific Jag. He was an artist. I think, if it took him more than 5 minutes, THAT test was a pass. I would imagine that he would know, how "to ride a dead horse"...

Or - maybe - give it away or ebay with tiny start price.

hi thanks
I will keep the engine and transmission as they have only done 2000 km since full rebuild
The seats since they are black and red i will probably put in the wifes s type
I didn't really want to give up on it but
Unfortunately it has finally beaten me
But on the up side we have 2 jaguars sitting in the UK

hi ebay wont let me list anything from new Zealand
and don't really want a car in parts lying around

Hi Peter
Thanks
I won't be doing anything before Christmas
As back in uk next week
I have been though the wiring diagrams but can't find where passenger compartment fuse box fuse 1 gets its power from
Also not sure if the replacement engine control module which was cloned from the original has corrupted vid block
and if that could cause no communication or should I at least get some kind of communication
So frustrating as ecm has power and earth
on the correct pins
So just two fuses that got me stumped engine compartment fuse f18 and passenger compartment fuse 1 5amp
everything else in car is working fine apart from steering column lock which wont release which could be to do with ecm
I will muck around with car for another few days
Thanking you
Darrol

Go back to one of your recent threads:

https://www.jaguarforums.com/forum/s...number-293421/

That fuse will not receive power until the ECM commands that relay to close. If the ECM is not powering up (for reasons still unknown), fuse F18 will not be powered. I think this is a normal response to the ECM problem, and not the root cause of it.



This fuse is part of the starter control circuit. It will have nil effect on powering up the ECM. The only time this fuse is powered is when the key is turned to the Start position. If checked for voltage at any other key position, it will be dead. See figure 02.2 in the wiring diagram.

Hello karl
Thanks for that
yes I figured out passenger compartment fuse 1 only gets power when you try to start engine
Checked crankshaft sensor wires today no power going there when trying to start engine i could be wrong but ecm sends a signal i believe it on 5 volts going to crankshaft sensor
So now looking more like when they cloned the replacement ecm the vid block could have been Corrupted
And causing engine compartment relay #4 throttle body relay #5 engine management system not to energize the relays to send signal to ecm
Thanking you
Darrol

Hi Darrol,
I know that some people think that AI-generated answers of browsers are not worth looking at - I beg to differ...:

I am not sure, if different web-browsers give you different AI generated answers, but I am quite happy with the AI answers from my "brave"-web-browser. I just asked it "Jaguar S-Type ECM does not work", and I got the following reply - I don't know - maybe it gives you new ideas...:

>>>>>>
If your Jaguar S-Type's ECM is not working, several potential causes and solutions exist. A common issue after replacing the ECM, especially with a used unit, is that the new module must be properly programmed to match the vehicle's immobilizer system and VIN; otherwise, the anti-theft system will prevent the engine from cranking. Even if the part number matches, the ECM needs specific programming for the vehicle, which typically requires an OEM-level scan tool like IDS (Integrated Diagnostic System) or SDD (Service Data Download), along with a compatible interface device such as the VCM.Communication failures between the ECM and diagnostic tools can stem from electrical issues. Check fuses, particularly fuse 19 in the primary junction box, and ensure proper power supply and grounding to the ECM. Pinpoint tests recommend verifying voltage at specific pins (e.g., pin 22 for permanent supply, pins 23 and 24 for EMS supply) and resistance at pin 04 (B) to ground. If voltage is below 10 volts or resistance exceeds 5 ohms, repair the circuit or ground connection.

In some cases, the ECM may lose communication due to network issues. For example, a "SCP network error" and codes like U1041 (vehicle speed not obtained) or P0715 (input/turbine speed sensor circuit malfunction) may point to problems with wheel speed sensors or the transmission control module (TCM), which can indirectly affect ECM communication. Inspect the transmission wire harness for damage, corrosion, or water intrusion, especially near the TCM located behind the driver’s side dash.

If the ECM is not communicating with diagnostic tools despite proper connections, a software reset may help. One user successfully restored communication by advancing their computer’s date by one year, running data collection in IDS, restoring initial vehicle data, and configuring the existing ECM. However, some remanufactured or used ECUs may have the VIN permanently written and cannot be reprogrammed without JLR-specific tools or software.

In summary, ensure the ECM is correctly programmed using OEM tools, verify electrical connections and fuses, inspect for wiring damage or corrosion, and consider software-based resets if communication is lost. If these steps fail, professional assistance from a dealer or a specialist with IDS/SDD capability may be necessary.

Hi true
Had another thought just get a another engine control module/ instermint cluster/ and ignition lock with key
All from the same vehicle
And hope that might work
Not sure if I will need the body control module
Or if ecm numbers need to be identical to mine
If its a complete swap over
I have tried looking it up but keep getting different answers

Cheers
Darrol

They should at leat talk to OBD tools but should also go into anti-theft.

So sorry for your problems and you put a lot of effort into it before you gave up. Hope to see you give it a few more tries.
Too nice of a car to junk out but it does look to be the end of the line.
.
.
.

I have a 2001 S Type, the car didn't start and had no communication with the PCM. In my case had to change the PCM, cluster and ignition switch cylinder all from the same car and it worked. From what i remember there's two numbers that need to match on the PCM from your car and the Donor car. this was my PCM, circled in red the two codes / numbers that need to match, you can search on ebay by the lower one on you PCM/ ECM

One caution with this approach. Can't say if this method would work on a 2003+ model, but it would appear plausible. The problem is if emissions testing is required, and if so, how this is accomplished.

Here in the People's Republic of Oregon, it's a quick process where the test equipment is connected to the OBD port. Amongst other data, the VIN is automatically uploaded to the test equipment. The inspector then compares this electronic version to the physical VIN on the door jamb sticker and the metal tag at the windshield base. If the 3 items don't match, that's an automatic failure. The car may run just fine but if the numbers don't match, it can't be registered (or renewed).

Your locale may not require this, or there may be some official procedure to work around it. But if you just show up with mismatched numbers, I think the assumption is the vehicle is stolen or illegally modified.

This has an entirely different PCM (Denso, rather than Ford), network, and so on. On the plus side the newer (Denso) ones can be reprogrammed using IDS/SDD.

Hi thanks Karl
No there is no emissions test required
for wof / mot in new Zealand as long as vin on windscreen matches what they have on there systems its all good

Hi thanks
the one for my str is a Denso
Like this but this is a spear for the wife's 03 4.2 N/A
They look almost identical on the outside
I have sent mine away to a different company to get them to check if they were cloned correctly and have the same vin number
I'm not sure if they can read the vid block

As I still wondered if when cloned the vid block could have been Corrupted And it transferred Corrupted data
I have asked the original company who cloned it but they won't reply
Thanking you
Darrol

I'm under the impression that a Denso PCM can be programmed fully using IDS/SDD's "As Built" data. Maybe someone knows?