Viscomatic FLT read out to diagnose 4x4 error light

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Cavallino
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Viscomatic FLT read out to diagnose 4x4 error light

Post by Cavallino » Sat Feb 22, 2020 3:19 pm

So I finally hooked up the FLT to my Viscomatic ECU to diagnose my 4x4 error light.
FLT:
“Signal of steering angle:
Caused by :
Signal too weak”
On FLT, steering angle sensor reads constant “-128” with steering wheel straight or turned in any direction.
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Alfan
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Re: Viscomatic FLT read out to diagnose 4x4 error light

Post by Alfan » Sat Feb 22, 2020 8:25 pm

One step further :)

I think you can both read out voltage and percentage of the steering angle. I assume you have been able to erase the code and find if it comes back after a restart.

You can read some more here:
http://www.alfaromeo164register.com/vie ... f=2&t=1408
1994 Alfa Romeo 164 Q4 Proteo Rosso 550.000km
1989 Lancia Thema 8.32 Verde Indy 270kkm
2001 Alfa Romeo Spider 3.0 24V Blue Lightning 60kkm
2011 Alfa Romeo Giulietta Multiair TCT Bianco Pastello 195kkm
2015 Alfa Romeo 4C Rosso Competizione 100kkm

Cavallino
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Joined: Thu Nov 14, 2019 2:26 am

Re: Viscomatic FLT read out to diagnose 4x4 error light

Post by Cavallino » Wed Feb 26, 2020 1:11 am

Hooked up the FLT again after locating the steering angle sensor. The plastic piece is a little brittle but in one solid piece, so I didn’t want to remove it. I did turn it however, but the values on the FLT remain the same. After removing the entire sensor for further inspection, one of the wires (yellow) is a bit frayed. Could this be the culprit? Where would I source a new sensor?
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Alfan
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Re: Viscomatic FLT read out to diagnose 4x4 error light

Post by Alfan » Wed Feb 26, 2020 10:52 am

So it seems to be an electrical problem. I don't know if they are easy to find, but you should look up the part number for it. The same part was used for some Lancias.

You chould try and measure, if you have continuity through the wires, maybe it can be fixed.
1994 Alfa Romeo 164 Q4 Proteo Rosso 550.000km
1989 Lancia Thema 8.32 Verde Indy 270kkm
2001 Alfa Romeo Spider 3.0 24V Blue Lightning 60kkm
2011 Alfa Romeo Giulietta Multiair TCT Bianco Pastello 195kkm
2015 Alfa Romeo 4C Rosso Competizione 100kkm

finalfa
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Location: Espoo, Finland

Re: Viscomatic FLT read out to diagnose 4x4 error light

Post by finalfa » Wed Feb 26, 2020 12:44 pm

The part number for the steering angle sensor is 60568856.
The sensor has three cables. One for ground, one for constant 5V and one for signal.
Alfa Romeo GTV 6 2.5 -83
Alfa Romeo 156 2.5 V6 -02
Alfa Romeo 164 Q4 3.7 -96
Alfa Romeo 164 Q4 3.0 -94

Cavallino
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Re: Viscomatic FLT read out to diagnose 4x4 error light

Post by Cavallino » Thu Feb 27, 2020 10:19 pm

Alfan wrote:
Wed Feb 26, 2020 10:52 am
So it seems to be an electrical problem. I don't know if they are easy to find, but you should look up the part number for it. The same part was used for some Lancias.

You chould try and measure, if you have continuity through the wires, maybe it can be fixed.
Do you know what each wire should measure?

Cavallino
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Joined: Thu Nov 14, 2019 2:26 am

Re: Viscomatic FLT read out to diagnose 4x4 error light

Post by Cavallino » Thu Feb 27, 2020 10:21 pm

finalfa wrote:
Wed Feb 26, 2020 12:44 pm
The part number for the steering angle sensor is 60568856.
The sensor has three cables. One for ground, one for constant 5V and one for signal.
Thank you

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Alfan
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Re: Viscomatic FLT read out to diagnose 4x4 error light

Post by Alfan » Fri Feb 28, 2020 8:39 am

Cavallino wrote:
Thu Feb 27, 2020 10:19 pm
Alfan wrote:
Wed Feb 26, 2020 10:52 am
So it seems to be an electrical problem. I don't know if they are easy to find, but you should look up the part number for it. The same part was used for some Lancias.

You chould try and measure, if you have continuity through the wires, maybe it can be fixed.
Do you know what each wire should measure?
Continuity is just measuring the resistance in the wire, so if connection is not broken, you should get ~0 resistance. It is also worth cross checking the wires, so they don't touch each other (metal to metal). Your mechanic should be able to help with this.

If you disconnect the unit from the steering rack, you can turn the part that goes into the plastic part. You should be able to measure a voltage change, if it works.
1994 Alfa Romeo 164 Q4 Proteo Rosso 550.000km
1989 Lancia Thema 8.32 Verde Indy 270kkm
2001 Alfa Romeo Spider 3.0 24V Blue Lightning 60kkm
2011 Alfa Romeo Giulietta Multiair TCT Bianco Pastello 195kkm
2015 Alfa Romeo 4C Rosso Competizione 100kkm

Cavallino
Posts: 29
Joined: Thu Nov 14, 2019 2:26 am

Re: Viscomatic FLT read out to diagnose 4x4 error light

Post by Cavallino » Fri Feb 28, 2020 2:15 pm

Alfan wrote:
Fri Feb 28, 2020 8:39 am
Cavallino wrote:
Thu Feb 27, 2020 10:19 pm
Alfan wrote:
Wed Feb 26, 2020 10:52 am
So it seems to be an electrical problem. I don't know if they are easy to find, but you should look up the part number for it. The same part was used for some Lancias.

You chould try and measure, if you have continuity through the wires, maybe it can be fixed.
Do you know what each wire should measure?
Continuity is just measuring the resistance in the wire, so if connection is not broken, you should get ~0 resistance. It is also worth cross checking the wires, so they don't touch each other (metal to metal). Your mechanic should be able to help with this.

If you disconnect the unit from the steering rack, you can turn the part that goes into the plastic part. You should be able to measure a voltage change, if it works.
Yes, my mechanic did turn it, 360 degrees also to "reset" it. I'm almost positive I need a new sensor.
I can't seem to find one ANYWHERE. I am hoping Ed can help me.

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Alfan
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Re: Viscomatic FLT read out to diagnose 4x4 error light

Post by Alfan » Fri Feb 28, 2020 3:15 pm

It might be worth to see, if the old unit can be repaired. I don't recall having heard of anyone trying, though...
1994 Alfa Romeo 164 Q4 Proteo Rosso 550.000km
1989 Lancia Thema 8.32 Verde Indy 270kkm
2001 Alfa Romeo Spider 3.0 24V Blue Lightning 60kkm
2011 Alfa Romeo Giulietta Multiair TCT Bianco Pastello 195kkm
2015 Alfa Romeo 4C Rosso Competizione 100kkm

Cavallino
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Joined: Thu Nov 14, 2019 2:26 am

Re: Viscomatic FLT read out to diagnose 4x4 error light

Post by Cavallino » Fri Feb 28, 2020 9:58 pm

Alfan wrote:
Fri Feb 28, 2020 3:15 pm
It might be worth to see, if the old unit can be repaired. I don't recall having heard of anyone trying, though...
Doesn't seem like it.

If anyone knows of one for sale, please let me know.

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Alfan
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Re: Viscomatic FLT read out to diagnose 4x4 error light

Post by Alfan » Sat Feb 29, 2020 6:59 pm

1994 Alfa Romeo 164 Q4 Proteo Rosso 550.000km
1989 Lancia Thema 8.32 Verde Indy 270kkm
2001 Alfa Romeo Spider 3.0 24V Blue Lightning 60kkm
2011 Alfa Romeo Giulietta Multiair TCT Bianco Pastello 195kkm
2015 Alfa Romeo 4C Rosso Competizione 100kkm

Cavallino
Posts: 29
Joined: Thu Nov 14, 2019 2:26 am

Re: Viscomatic FLT read out to diagnose 4x4 error light

Post by Cavallino » Tue Mar 17, 2020 1:08 am

Alfan wrote:
Sat Feb 29, 2020 6:59 pm
Not cheap...
https://www.ricambinuovi.com/store/_it/ ... 8856/10350

You can try and ask here https://www.alfabb.com/forums/164-168-1991-1995.16/ if anyone has a spare one.
yes, I saw that site. they still have it listed, but unfortunately if you look closely in italian it says "non disponibile" and in english "no longer available" or "out of stock". also, I've been on alfabb for years, but the largest number of Q4-specific knowledge and owners are definitely on this site.
thank you for your continued help.
I just received one from Ed, he is the best. will update everyone once installed.

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