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Old 4 Weeks Ago   #16
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Re: Power Steering Saga Part Deux

I suck at soldering. Might try cutting one off with some tails at the scrappy and get some bullet crimp terminals and shrink tubes to join them.

Probably still have change from the £12.95 lol.
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Old 4 Weeks Ago   #17
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Re: Power Steering Saga Part Deux

Quote Originally Posted by TigerTom View Post
...QUESTION: For those more experienced with auto electrics than me, how sensitive are the CAN connectors to loose/wobbly connectors...
CAN works with voltage difference between two wires to generate the message: either wires are at low potential (< 2,2V) or at high potential (>2,2V) to set the bit high or low (recessive or dominant in CAN wording). That makes CAN quite robust, electric and noise wise, but of course if the connection is erratic, so will be the signal and therefore the information! Which can lead to a non working system ...

I'd try to fix that wobbling connector (tape, wedge, tie-rap) and see what happens before permanent repair.

BRs, Bernie

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Old 2 Weeks Ago   #18
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Re: Power Steering Saga Part Deux

Quick update.

I crimped the connectors on the plug and got a good secure fitting to no avail.

I put it into my local garage yesterday who are really nice guys. Their Snap On unit wouldn't connect to the body module so they had to say they couldn't help.

They've referred me onto an auto electrical specialist who they rate very highly.

So I'm booked in their for the a week on Friday.

Finger Crossed
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Old 5 Days Ago   #19
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Re: Power Steering Saga Part Deux

Ok so update on all this.

Took it into my local garage, there 6 month old Snap On unit wouldn't connect to the car, neither would their 3 year old Autel so they gave me the car back, no charge. Top blokes.

They put me in touch with an auto electrical specialist. He's verified all the physical can lines are good and the signals are going round as they should.

So we're looking at a software issue now, either the power steering software or the BCM software.

He's saying they can't get the VIN etc off the BCM. He's checked the eProm memeroy contents and they're coming out as gibberish.

Does anyone know if Fiat's eProms are encrypted by any chance?

So he's gone off to speak to EcuTesting who refurbished the power steering unit, and to speak to the local Fiat techs about the BCM.

Can't fault the guy he's determined to sort it. Fourth day he's had the car and he's only charged me for an hour of his time. Top bloke.
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Old 5 Days Ago   #20
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Re: Power Steering Saga Part Deux

The CAN bus uses a // topology where every device (module) is connected to TWO wires. Even though different modules are connected to different ports when entering the BCM (body control module), they are internally connected in // before entering the CAN µchip.
So if one of the modules gets shortcut or brings lot of noise on the bus, all the others (on the same branch) will be impacted.

I'd suggest your fellow specialist to disconnect as much CAN as he can (hahaha), but the BCM to OBD one to see if he can retrieve info thru the diagnostic plug. Starting from there and if the test shows good results, I'd reconnect the othe modules one by one to find wich one is faulty. If he still can't read anything with only the BCM CAN-connected, then probably the body computer is at fault ...

EDIT: added drawing

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)
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Last edited by Bernievarian; 5 Days Ago at 12:31.
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Old 1 Day Ago   #21
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Re: Power Steering Saga Part Deux

Hi All,

I think I've finally got a resolution on this. After Leon spoke to Fiat we came to the conclusion that ECU testing had supplied an incorrect part with a variant of the software that was incompatible with the body control module.

After cross referencing their part number with the original Fiat part numbers I could see they had sent me the wrong unit. As far as I can tell they sent me a unit for the EVO model which use a different variant of the Delphi software which isnt backwards compatible.

After a few terse conversations with ECU testing they sent me another unit with the same part number as the wrong one!, but a different looking unit.

Crucially the Delphi part number is the same as the original and the steering angle connector plug is external like my original one.

Plugged it in on the floor and no error message. So fingers crossed this will sort it.

Don't know why I didn't think to check before. I guess as they had my unit when they said it was beyond repair and sent me a new one I'd assumed it was the right part.

Now having a conversation with them about compensation for my having to buy multiecuscan and cable, a multi meter, and a specialists bill to fix their mistake.

They kept insisting my car was at fault. The rebuilt units are good though, just a shame about their customer service.
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