Engine suddenly shuts off

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exporschdrivr

Junior Member
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98
Yes. If the light is on it‘s not possible.

I‘m not quite sure if I hear the pump than or not.

but if the light goes off suddenly, I can again switch the gears right after it‘s off.

make sense to me: If there is a fault why should the pressure be kept between 40 an 50bar? Would just drain the battery?!
 
Zep

Zep

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exporschdrivr said:
Yes. If the light is on it‘s not possible.

I‘m not quite sure if I hear the pump than or not.

make sense to me: If there is a fault why should the pressure be kept between 40 an 50bar? Would just drain the battery?!
Click to expand...

The point is the fault could be the pump. Or one of the other things I have said.
 
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exporschdrivr

Junior Member
Messages
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Yesterday I tested a few things. I cleared the OBD codes and started the engine, put it in 1st gear a moved a bit forward, than in reverse and back.

I did this 2 or 3 times. At the last one, I had it in reverse, the car was not moving as is used to. So I put my feet again on the gas a little bit more and it moved just a little bit near to nothing. I was quite suprised and decided to put my feet more on the gas to see if the clutch will work with more gas, but then the engine went off.

P1586 was again the first code. I cleared it and it was not coming back, but the CC light was still on and I have this beeping noise. I couldn´t change the gear anymore.

So I turned the ignition off and reset the car with the battery switch in the trunk. As I unlocked the car and open the driver door I heared the pump for just 0,5s. It was really short, but long enough to recognize it.

I locked and unlocked the car again and I heared again the pump for 0,5s. I could repeat it as many times I wanted to. The CC light was still on, beeping still on but no codes which I could read with a standard OBD reader. And it was still not possible to change gears.

Is this normal? I mean if the pressure drops under 40bar the pumps kicks in and should run a few seconds, right? If the pressure in the system is above 40, the pump wouldn´t do anything?

Or does the pump really run everytime I unlock the car even if the pressure ist over 40bar just for 0,5s until the system recognize is enough pressure in the system?
 
Zep

Zep

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Yes, from my memory it would start whenever you unlocked or opened the door, even for a short time.

So P1586 means the TCU has told the engine to stop. But when you clear that the CC fault is still present so it won’t restart (the start command goes to the TCU and then the the engine. It doesn’t sound like the pump, so clutch position sensor or the angular sensor or both. So you really need to have the gearbox codes read so you know what it happening.
 
safrane

safrane

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16,852
you may have checked already but is there enough fluid in the F1 system?

Also can you still cycle through the gears with the ignition on (but engine off)?
 
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exporschdrivr

Junior Member
Messages
98
safrane said:
you may have checked already but is there enough fluid in the F1 system?

Also can you still cycle through the gears with the ignition on (but engine off)?
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No, I haven´t checked the fluid level.... I thought if the system is working properly when it´s cold, it should be enough fluid in the system. The level should raise, when the oil gets warmer.


Yes, I can switch between first, neutral and reverse with ignition on and engine off. But not between higher gears. And only if the CC light doesn´t appear.
 
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exporschdrivr

Junior Member
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98
Another question: Is the clutch open or closed if there is no pressure in the system? Should be close like a normal gearbox, right?

I´m just thinking that maybe the pump has some kind of failure... when I let idle it a while in a gear the F1 pump has to work more often and maybe this cause the failure. I also think it takes more time to shut down the engine if I idle the car in N.
 
safrane

safrane

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16,852
If you are loosing pressure this would cause selection issues, but even with low pressure it would stay in gear until you try to get another.
 
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exporschdrivr

Junior Member
Messages
98
Today the car was read with a OBD Tool which also allows to read Maserati codes.

I had to use the Quattroporte 2003-2006 to get access to the TCU. But the Duo Select at the Quattroporte is the same as the Cambiocorsa, isn´t it?

Then I deleted all codes and started the engine.

The code that ist coming back is P1710 at the TCU which should be clutch position sensor. Engine shows P1586 as Engine off request from gearbox control ECU.

Should it be really the CPS? Why does it work when it´s cold?

It seems that the warming exhaust or something else thats warming up causes the problem. Maybe I should isolate the wiring more and see if its last longer until the engine shuts off?!
 
Zep

Zep

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Two of your original codes were for the CPS. It’s looking more and more like that is your problem.
 
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exporschdrivr

Junior Member
Messages
98
Yes, I will check the wiring and also the connection of the sensor.

Also I will maybe isolate the wiring with something what absorbes heat. The fault only occurs after the engine is warm.
 
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exporschdrivr

Junior Member
Messages
98
I brought the car into a shop and now there are telling me the clutch is done and needs replacing.

I´m a bit confused because the clutch is working properly until the car is warm... how much does the clutch job cost in yur area for comparison?

Thank you.
 
Swedish Paul

Swedish Paul

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exporschdrivr said:
I brought the car into a shop and now there are telling me the clutch is done and needs replacing.

I´m a bit confused because the clutch is working properly until the car is warm... how much does the clutch job cost in yur area for comparison?

Thank you.
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It’s not the clutch. If you can get all gears when cold. Here, usually folks drive them until it doesn’t work at all.

Does the clutch position sensor cut out the engine, I’d be surprised as it would be dangerous to the cut the engine out when moving. If you are standing still when it happens, I know the clutch sensor will not allow the engine to start if it doesn’t know where the clutch is. Maybe standing still, it does the same thing.
 
Swedish Paul

Swedish Paul

Member
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1,810
Also, the is the gearbox ecu quite close to the battery. It’s quite easy to dislodge the connections when changing the battery. Have you done that recently. I would be checking all connections in fact.
 
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