Hello everyone
thanks to those who offered advice
Yes I have definitely got a can bus problem
Tested pins 6 & 14
got 114 ohms Resistance
Tested can bus hi reads 2.5 volts
Tested can bus low reads 2.2 volts

I understand there are two 120 ohm resistors on can bus network one either end
Let's put it this way reading wiring diagrams is not my strong point
building engines and transmission is what I'm quifiled in

The wife is getting pissed off as some of you know we move to the United Kingdom at end of the month for two year's
and we don't have a car for her over there yet
Mine is sorted all waiting for us to arrive

Ok back to issue
So far I have unplugged every control module over a day and used jlr ids to read codes
when scan every module unplugged reads Communication failure until its plugged back in
except engine control module plugged in or not read communication failure
most fault codes relate to can bus non Communication with engine control module
like
Transmission
Instermeint cluster
Abs
Dsc

Would anyone know where the two 120 ohms
resistors are located
I'm being to think one of the 120 ohm resistors could be in the engine control module
That would explain the high reading of 114 ohms and not the 60 ohms it should be
I phoned a friend in the uk and he has just sent me another
Engine control module
Should be in new Zealand in 5 days time
Also is there any other test I should try

Starting to feel like just sending car to the brakers yard
Thanking you
Darrol

 

I don't know about your 120 Ohm resistors, but if you are asking yourself, if they are in the ECM, and you don't know, while you have also shown that the ECM seems to be defective, it tells me that you have not opened your ECM yet. Would that be right? If I were convinced that the ECM is faulty, I would open it (just like I have currently the ECM of one of my Fairlanes sitting next to be - opened up).

After opening it, you could look for the 120 Ohm resistors - sometimes, numbers are printed on those components, so that it would actually say 120 Ohm, most of the time it's the 3-ring code followed by the silver or golden ring - the silver or gold is only about the tolerance of that resistor. 120 Ohm would be brown red brown. Sometimes a 5-ring code is used, but your also find that one explained, if you google "resistor code".

But most of all: If you suspect a module to be faulty, the general go is to open it and look for cold welds (=cracked solder points).

 

Not positive but i think one is in the abs module and the other in the instrument cluster/pack. I had what i thought was a canbus problem and did a lot of testing. That is what i remember. I remembered wrong. Trrmination resistors in pcm and instrument pack. Just looked at electrical for your year car. There are 2 wires twisted together. Green for negative and yellow for positive

 

https://www.jaguarforums.com/forum/x...2/#post2679994
this thread might help

 

The CAN terminating resistors are shown in the Electrical Guide - see Fig 20.1 - as being in the "ECM" & cluster.

If not working you could well be chasing the wrong module entirely but I understood the correct resistance was already checked.

 

Hi thank you
Was a hectic day yesterday
did even look at car
Everything sorted out for moving at end of month
Got our International drivers licenses sorted
we have now purchased our jaguar s in the UK
yes its definitely going to be different
Especially with all your rules and regulations for driving
As we get away with so much in New Zealand
one big change is we are in Kilometers per hour
And you are in miles per hour

Any way regarding hi Resistance on can bus network
like you said
If my ecm is dead and that has a 120 ohm resistor
that would explain my 114 ohm on can bus network
Next step i guess is to test the ecm connector plug
and make sure thats all good
Thanking you
Darrol

 

We're a very busy crowded place so need quite a few rules, only some of which suck.

ECMs don't tend to die, they're very very robust - but they can (e.g. water intrusion due to owner not clearing drains). Usually it's something else like rodent chewed wiring.

You can't just swap an ECM - they're a complex part of immo.

You could add a 60ohm resistor just to see if the TCM then responds.

Good luck with the move - and watch speed limits!!

 

If you see in the thread i posted it ended up being the instrument cluster. His car had 105 omhs at 6 and 14

 

Hi thanks
I'm more worried about my wife driving over there
She loves the go pedal
her jaguar in the UK has more power than her 4.2 s type
We have a speed camera about 5 km away from our house
but she gets a ticket at least once a week even though her car has a radar detector that tells her its there
Thanking you
Darrol

 

If she gets 3 points each time she'll be banned quite quickly. Insurance can get costly, too.

 

hi just printed it off
Removed the ignition lock today and took it to the locksmiths they said the tumblers are in great condition and the little flap on ignition is fine but said there was a bit of play in the ignition switch at back of lock that connects to wiring harness

Spoke to a family friend who suggested removing the ecm and putting a 120 ohm resistor between the can hi and can low to see if that makes a difference it could only be the resistor that's failed cutting communication upsetting the instrument cluster transmission abs
and not allowing j gate to move out of park

then try on Instrument cluster side as well
still have the electronic park brake fault
But can hear the brake Disengaging and engaging

Went out and purchased a ob2 protocol breakout box today
hopefully that might help a bit

Thanking you

 

thanks for that
In New Zealand if you get 100 points on your licence you lose it for 3 months
but we can apply for a special permit to drive between set times
Dose not affect insurance
If you get a speed camera ticket we don't have any points taken off only a $ 30.00 fine in the 📫
Beginning to think the wife should have got something with around 120 hp instead or something that gos from
0 to 60 mph in 1/2 a hour lol
Thanking you

 

On the CAN: you could add a 60ohm anywhere. It'll be fine for testing.

Also, it could be why you can't see the ECM.

It does not have to be the ECM which is off the bus! It can be the cluster.

 

Hi so true
I will put a couple of photos on tomorrow what jlr ids
Is showing
Thanks

 

If CAN overall isn't roughly 60ohm the signals will be horrible and it's more or less luck what works or partially works.

 

Went out and purchased a ob2 protocol breakout box today
hopefully that might help a bit


this will help a lot

i got one myself. Saves you from squishing under the dash to see and being sure of pins being tested

 

Exactly. Most can problems i have read about on the forum are cluster related. If by chance your cluster is faulty i have a good used cluster i bought thinking mine was faulty if you are interested. It is the R model cluster too