Hi everyone Hope you all had a great Christmas break

Ok
I had a brake from trying to sort out no communication with engine control module
On the 2003 str
Now looking at trying to sort it out
This is where I am getting frustrated

If I use my JLR IDS SDD
i only get no communication with engine control module
And other modules have u1900 and u2523 codes
pointing to canbus faults

if I use icarsoft cr pro
I get no communication with engine control module
Abs / dsc climate control module
same codes

If I use my topdon ad900
I get no communication with engine control module
Abs dsc park brake module drivers door module

Pats is not putting out any blinks code
Canbus network is fine

So my thoughts are
Is it possible that the instrument cluster is not sending a wake up signal to ecm
There for ecm stay in sleep mode
If I understand correctly the instrument cluster is the gateway
I could be wrong

But the part I'm finding confusion is everything on cluster like fuel indicator lights ect are working
but dose that mean there could still be a issue with the cluster

you're thoughts would be greatly appreciated
Thanking you
Darrol

Your era STR uses ISO9141 for the PCM (aka ECM) so you can ignore CAN for now.

If your OBD devices are trying to use CAN, that's the problem.

If they're trying to use ISO9141 and get nowhere follow the Workshop manual pinpoint tests for it. Include power & ground on the DLC (OBD socket) as well.

The actual PCM is very very robust so is the last suspect.

(Even an elm327 can manage ISO9141 e.g. to my STR.)

Do you have power and ground at the OBD socket as JagV8 asks?

Here is a pin out of the OBD connector.




Make sure #5 is a ground and #16 has 12 VDC. Those two are needed to power the code readers. Check #4 for ground too but that does not keep the code readers from communicating. Post back what you find.
This is not a common fault but with your symptoms I am not sure what to suggest?
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Hello Kevin
Thanks for response
Thanks for the diagnostic port pin out
I recently purchased a new Diagnostic port brake out box that has led lights for all connected pins and you can cheek voltage on any pin
my concern is pin 6 can high is shown 04.0 volts
Which is to high i believe
the green lights show what is Communicating
and shows ground on pins 4 & 5
This is why I am thinking there could be a issue with instermint cluster
As in photo,s below

Thanking you
Darrol

Thans jag v8
I have 3 elm327, s but after doing some research
And spoken to the people i purchased from
they all said they will not work on jaguar
I don't know if that is bullshit or not
So still trying to find one that other jaguar owners use

I have added some photos below on Kevin response

Thanking you
Darrol

Hello Kevin
Thanks for response
Thanks for the diagnostic port pin out
I recently purchased a new Diagnostic port brake out box that has led lights for all connected pins and you can cheek voltage on any pin
my concern is pin 6 can high is shown 04.0 volts
Which is to high i believe
the green lights show what is Communicating
and shows ground on pins 4 & 5
This is why I am thinking there could be a issue with instermint cluster
As in photo,s below

Thanking you
Darrol

An elm327 should work, just don't let the software try to use CAN as that won't work for what you want.

For talking to your PCM (aka ECM) CAN voltages are not relevant.

You can look at the Jaguar Electrical Guide for your car, section 20, and see the wiring. (Same as mine.)

Well the OBD port looks good. Sorry and I am following your problems but not sure what to suggest next.
As posted above the CAN stuff won't affect the PCM connection.
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Tech Line used to send monthly 'tech-tips' to us at the dealer.
These might interest you?

The Recovery has to be worth a try.

As regards the inst cluster, the PCM (ECM) wiring for ISO9141 is direct from the DLC (OBD socket), not via the IC.

I'd check ISO9141 wiring/fuses/relays etc first and only then the Recovery.