U1706 ошибка fiat

Hi all!

After a very happy stilo motoring across France for two weeks On starting her up in order to drive off the ferry back to Blightylast night; i get the dreaded ‘beep beep beep’ and a simple message saying «Loose Connection» the car however drives perfectly except for the speedo doesnt work and a yellow ! in a triangle, the abs light and the handbrake lights are also permenantly on.

So i pull over at the nearest services and get on the trusty Fiat Forum on my phones internet, as always I found much to be getting on with while I waited 2 hours for the RAC patroll. Sadly neither he nor I were able to fix it.

He plugged it into his code reader laptop giving the code:

U1706 ‘CAN Brake Control Node Intermittent’
after a few clearings and tinkering this then changed to permenant.

Between us so far we have thoughly which I checked twice today back home and after much more forum seraching:

Cleaned D4
Cleaned ABS M50 connector
Cleaned Both ECU Connectors
Cleaned C12 ABS Earth
Cleaned ECU and Battery Earths
Checked and cleaned all fuses and relay conenctors in the engine bay
Checked battery charge and charging
Checked battery earth

I have also been follwing one of Decks guides to HSSB regarding how to check D4 connector by checking the resistance between
M50 pin 40 to ECU Socket A pin 61
and
M50 pin 24 to ECU pin 45.

Sadly both of these came up with a very high resistance (off the scale) so I was wondering if the wiring diagram Decks provided in this guide was the one for a 1.9 JTD 03 reg also?

Also any other suggestions greatly appreciated :worship:

If helpful, the only additional history i can provide is one blown brake light bulb 1 week ago and twice before on starting for 1 second abs failure appeared on the screen and dissapeared immediatley.

Thanks for the suggestions Decks!

After following your excellent multimeter guide and instructions to lazzar

With the engine running on setting 200m the multimeter red 05.2v for good earth to C12 connecting ring and exactly the same for good earth to the screw where C12 attaches, does this mean a good earth?

With the engine off i get a voltage of 12.91v across the battery terminals

WIth the engine running i get a voltage of 14.1v across the battery terminals

WIth the engine running and headlights plus fan on I get a voltage of 12.85v across the battery terminals

And for my earth integrity check i get 0.4v

Are these also ok?

Next, as advised I checked F1 — fine

I then checked F42 — eureka!!!!!! A blown fuse!!!!!

Fuse changed and problem has now disappeared

Thankyou soooooooooooooooo much for your help Decks! A well deserved big formal thanks comming your way!

The fiatforum rocks!!!! :slayer:

However,

Do i still need to check the abs connector to ecu pins?

Should i be worried that something could have caused the fuse to blow and hence could do so again?

Also, are there any further preventitive measures i could take?

Thanks again for your help.

I have redone the readings and got:

Battery possitive to engine 12.7v with engine off

And with the engine off and multimeter set to 200m again 00.5v from battery negative to C12 tag.

Are these results better?

Thanks

Hey again everyone!

Sad news im afraid

On accidentaly selecting 5th gear rather than third, I again recieved the dreaded beep beep beep «Loose Connection» the car however drives perfectly except for the speedo doesnt work and a yellow ! in a triangle, the abs light and the handbrake lights are also permenantly on.

— exactly the same symptoms as a few weeks ago.

So I immediately check brown fuse F42 (7.5A) and its blown again, so I replace it, only for it to blow again immediately

Any suggestions would be very much appreciated, as im stumped :worship:

Hey Decks!!

Thanks for the quick reply

I have just been out and identified the down stream terminal (its the one at the bottom) but it was giving 14v with the ignition on, is this ok?

With the ignition off and multimeter set to resistance (200k setting) I connected the black multimeter connector to the end of a jump lead (using to extend from the negative battery terminal) and the red of the multimeter to the downstream of the fuse connector.

With M50 connected I got 14 and with it disconnected it climbed in increments of 10 to around 50!

I left all the other connectors connected to the battery negative and just cliped it on top, is this correct? Or should I disconnect them all first and have only the jump lead on the battery negative terminal?

https://www.fiatforum.com/attachment.php?attachmentid=81945
Thanks again for all your help

No, sorry 14v from the top one and 0v from the lower connector for the fuse connector.

Ok cool, I have just tested resistance on 200k setting from the downstream port to just the tag of C12 (with it and the nut removed from the car body) and i got a consistent 12, which did not change with wiggling the connected M50, the fuse pannel or the C12 wire.

Is this correct or should I measure it at the tag while screwed onto the car body?

Thanks again

Thanks Decks!

How do i find Maxi Fuse F1?
Also, would you suggest I replace it and check its connections?
Is there anything else I can check with it???

I think we may have hit the jackpot

Maxifuse F1 has a slightly snapped off plastic surround, i guess due to a forcefull replacement of the battery cover. The fuse pins are also slightly bent and on one side the contacts in the fuse slot seem to be shorter than the other!

I have bent as best as i can the shortend contacts but im not sure wether this is a permenant fix, would you suggest replacing the whole fuse pannel? Would this be easy?

Thanks again Decks! Your an absolute legend :worship:

Thanks

Has anyone done this before and made a guide or something similar by any chance?

Also, is it likely that I will balls the whole thing up if I attempt it as I dont have much experience with electricals?

If I do mess it up, is it simply a case of getting a new one from a scrappy and just swaping them over?

Thanks!
Will see how long my bodge job holds out, first time it goes again, il give it a crack or wait till I get a free weekend

A big thanks to everyone for all your help, will let you know how I get on

PROBLEM SOLVED!!!!

FIX:

After 6 months of searching ive finally found the problem!
A quick reminder of the symptoms:

Beep Beep Beep «Loose Connection»
Preceded by blowing of fuse F42 (steering column)
Replace fuse F42 — temporary fix for an hour up to a week
Fault codes given as above!
Before fuse replaced: ABS light, handbrake light etc. constantly on and no speedo!

Also;
Beep Beep Beep rear number plate bulb blown
Alarm sounding randomly for no reason most times when set

Final symptom;
Turned ignition off but every light on the dash illuminated on despite the keys being in my hand!!!!

The only fix being removing unblown fuse F42

On removing the large connector to the ABS ECU and noticing a strong smell, I noticed smoke emanating from beneath the ABS ECU so quickly removed fuse F1 and phew the smoke stopped!!!

EUREKA!!!!!
There is a large wiring loom which enters the engine bay beneath the ABS ECU, however, Fiat in their infinite electrical wisdom have made this loom too short so it very slowly rubs through the bracket which holds the ABS ECU in place resulting in intermittent electrical faults listed above!
Fortunately I found this just in time before a major car fire

I urge everyone to check very carefully that there loom is not rubbing here too, even without symptoms as some strategic electrical tape could save a lot of hassle and fire!!!

Simple fix was a tow truck to my local auto electrician who replaced this section of loom for £100!!

All problems now absent for 4 weeks