Diagnosing the F1 System

exporschdrivr

Junior Member
Messages
98
Did you try this ??

Whilst running the engine after a 20 mins warmup - time the F1 pump interval in Neutral and then in 1st with foot on brake.

Don’t change any components based on faults codes alone......


The above meaning the Launch system and others are just mass produced number displays , the manufactures of these devices just sign up to an expensive database of the vehicle diagnostic functional specifications then write the code.

We are the designers and supplier of the EasyMAS system and agree the other systems available on the face of it look very promising and are what they are.

EasyMAS though has been driven using Maserati vehicle knowledge based on problems facing many owners. Our system takes in the numbers and checks them against the vehicles specifications and known issues.

No Maserati ECU can self-diagnose to a point of 100% accuracy based on fault codes alone , it’s a best guess and why many times components are changed by main dealers and after driving home with your wallet empty the fault returns.

So in this case it may just be the “Clutch position sensor” but other operational tests need to be performed like the timing test at the top of this post.

We have seen the same problem resulting in new battery, ECU, clutch position sensor, pump, relay, accumulator, position potentiometers, etc etc. The actual fault was a loose bypass screw on the hydraulic valve pack.

Regards

I have done that but without counting the seconds/minutes. In neutral the pressure doesn't fall. It takes minutes I suggest.

Also in first gear the pressure nearly doesn't drop or very slow. To drop the pressure I need to shift. It take 3 to 4 shifts until the pressure drops from >50bar to <40Bar.

But I will do this Test once again and measure the time, just to be sure and not to overlook something.
 

Steve4200

Member
Messages
195
I have done that but without counting the seconds/minutes. In neutral the pressure doesn't fall. It takes minutes I suggest.

Also in first gear the pressure nearly doesn't drop or very slow. To drop the pressure I need to shift. It take 3 to 4 shifts until the pressure drops from >50bar to <40Bar.

But I will do this Test once again and measure the time, just to be sure and not to overlook something.

  1. Engine up to normal running temperature.
  2. Engine running in Neutral - Time in minutes between pump activations
  3. Engine running - foot on brake in 1st gear - Time in minutes between pump activations.
  4. Pump runtime for the above in seconds.
Regards
 
Last edited:

exporschdrivr

Junior Member
Messages
98
Since my last Post I replaced the CPS and the car drives fine. So it was really the sensor.

But I have another issue: While driving, after 50 or km, it's suddenly not possible to shift from 4th to 5th. The car shifts into N.

I have to slow down then until the TCU decides to put in 4th gear again. Selecting 5th gear is then not posibble. All other shifts from 1st to 4th are still possible/avaiable.

I have to pull over then, do the self learning, and then everything is ok. Selecting 5th and 6th is then not a problem anymore.

Any recommendations?
 
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conaero

Forum Owner
Messages
34,593
Do a rebleed first....a good long one then do it again.
Make sure you don’t run the pump too long or you will burn it out.

Retest to see if that’s better.
 

exporschdrivr

Junior Member
Messages
98
Does anybody know what's the difference between "Treshold for sure minimum shift to fifth" and "treshold for minimum fifth speed selection" at the Launch X431?
 

conaero

Forum Owner
Messages
34,593
Do I have to open up a bleeding screw or do I just run the routine?

Also I think I have to check the level first.
Open the bleed screw yes. It will go everywhere. You have to also to fill the resvoir at the same time and cut the battery to stop the pump burning out, 3 man job