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MrMagoo

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• Jul 23, 2020

• #1

Hi All,

Code P0715 popped up yesterday on my Dualogic and it wouldn't go past second gear. I believe this is the gearbox input shaft RPM sensor. Alfa OBD only shows a slight variation between engine RPM and gearbox RPM so I suspect it is a dirty/damaged/life expired sensor. But, I can't locate it, any idea where it is?

 

koalar

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• Jul 23, 2020

• #2

worn out clutch I believe

there is a Good thread on diagnosing the system I will see if I can find it


here it is


https://www.fiatforum.com/grande-punto-guides/439619-dualogic-troubleshooting-guide.html

 

Last edited: Jul 23, 2020

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MrMagoo

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• Jul 23, 2020

• #3

I am aware of that thread, I believe that is an indication of a worn clutch but there's no sign of any slip and it wheel spins off the line! It's an intermittent problem. It came on again this morning whilst stationary. I want to check out the sensor before examining the clutch.

 

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MrMagoo

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• Jul 23, 2020

• #4

Alfa OBD screenshot

 

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koalar

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• Jul 23, 2020

• #5

hopefully someone else be along shortly

I have no experience with the dualogic so cant help much

 

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DaveMcT

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• Jul 24, 2020

• #6

Fiat clutches when worn out often refuse to release before they slip. The Duologic can be hard on clutches.

 

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MrMagoo

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• Jul 25, 2020

• #7

Ok, found the sensor just above the passenger side driveshaft gearbox. Wanted to take it out and clean it and its connection but haven't got the right size spanner. No sign of slippage and full throttle kickdown is instant.

 

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Besa

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• Jul 25, 2020

• #8

MrMagoo said:

Alfa OBD only shows a slight variation between engine RPM and gearbox RPM

Click to expand...

Does the clutch disk speed ever show a stuck or absurd value? Like way off from the engine RPM?

Also can you share the system status information from AlfaOBD? Especially the parameters about the clutch?

 

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MrMagoo

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• Jul 25, 2020

• #9

I checked engine and transmission output and they were quite even but I didn't save the graphs.

 

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koalar

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• Jul 25, 2020

• #10

MrMagoo said:

only shows a slight variation between engine RPM and gearbox RPM

Click to expand...

koalar said:

worn out clutch I believe

Click to expand...

For example, to check whether clutch is slipping (for a Selespeed ECU) move "Engine rpm" and "Clutch disk speed" meters to the same tab, activate and zoom them, start scan and drive the car for some time. If the clutch speed is lower than engine speed for non-idle, the clutch might be slipping and considered for replacement.

Besa said:

Does the clutch disk speed ever show a stuck or absurd value? Like way off from the engine RPM?

Click to expand...

it doesn't look good. But always worth checking the simple things First.

 

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MrMagoo

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• Jul 26, 2020

• #11

Peaks, as in engagement, look fine, troughs between changes are near identical. No absurd figures.