Technical fiat 500l duel logic
- Thread starter JB121
- Start date
Currently reading:
Technical fiat 500l duel logic
Low pressure can be almost anything, but some of the error codes are open to misunderstanding- low pressure can mean that there wasn't enough pressure in the system to complete an operation because the pump didn't kick in at the right time, or that fluid is leaking away somewhere. Or many other things.
In simplistic terms, the system works by using the pump to create a reserve of pressure, with valves and actuators being opened electronically to "move the gear lever" or "press the clutch". Each of these operations "use up" some of the pressure, so, when it gets down to a pre-set level, the pump kicks in again to restore the pressure.
The accumulator is a metal "sphere" with a diaphragm across the middle, with gas on one side, and fluid on the other. This stores some of the pressure, so the pump runs less often.
It is possible to monitor the pressure in the system using MultiECUScan. You should be able to see readings fluctuate between the high (pump stops) and low (pump starts) values, which reduce in steps each time a gear change is made. When no changes are made, the pressure will slowly reduce over a few minutes by itself if the actuator is in good condition. If it has an internal leak, or the accumulator diaphragm has failed, , the pressure will drop in less than a minute.
A failed accumulator will cause the pump motor to run too often, leading to pump motor failure if not caught fairly quickly. This can be identified in MultiECUScan by the pressure reading fluctuating rapidly, and only getting one or two gearchanges between motor stop and start, rather than the usual amount (depends on model, but probably 8 or 10)
How have you diagnosed this?
As I said, some of the codes are easy to misinterpret, sending people down all sorts of wrong paths.
So...
No leaks?
Does it work sometimes?
When it works, can you hear the pump?
When it doesn't, can you hear the pump?
If you turn the ignition on, but leave the engine off, how many times can you go from Neutral to First and back again before the pump runs again?
So...
No leaks?
Does it work sometimes?
When it works, can you hear the pump?
When it doesn't, can you hear the pump?
If you turn the ignition on, but leave the engine off, how many times can you go from Neutral to First and back again before the pump runs again?
not sure about the pump when car works as only drove 2 short trips to get used to car as never drove a semi automatic before the first time i could not get gears was after not driving for a couple of days went to start her and would not go into n to start called aa and he managed to get her started lasted between three and 5 days and i was about 12 miles from home parked to go into shop and when i tried to start it said gears unavailable so left car and brother collected car for me he put his diagnostic on and it said pump low pressure he cleared the error and she ran again for another 4/5 days she gets all gears when she works i have not noticed any oil leaks when not working you hear no pump coming on at all .
That's all good news. Really does sound like the symptoms of a tired pump motor.
If you're stuck unable to get Neutral again, this might get you moving again as a temporary measure:
Keep a piece of wood (maybe a piece of broom handle or similar) and a mallet or hammer in the car.
When you get the problem, open the bonnet, close the drivers door, and using the wood and hammer, give the top of the gearbox a sharp tap. Not hard, just sharp. Instantly open the drivers door*. A tired pump should start up, at least for a while.
(*Adjust the above if the pump on a 500l is activated by pressing the remote key or whatever).
If you're stuck unable to get Neutral again, this might get you moving again as a temporary measure:
Keep a piece of wood (maybe a piece of broom handle or similar) and a mallet or hammer in the car.
When you get the problem, open the bonnet, close the drivers door, and using the wood and hammer, give the top of the gearbox a sharp tap. Not hard, just sharp. Instantly open the drivers door*. A tired pump should start up, at least for a while.
(*Adjust the above if the pump on a 500l is activated by pressing the remote key or whatever).
Try Shop4parts. May not stock it for a 500l, but always found them very helpful. If not, identify the part number on your existing one and post it here.
Be aware that the same motor was used in Alfas, Maseratis and Ferraris, so prices can vary depending on the seller's target audience!
Be aware that the same motor was used in Alfas, Maseratis and Ferraris, so prices can vary depending on the seller's target audience!
if i need multiecuscan what one should i get the 4.6 registered or the 4.6 multiplexed any suggestion
tried to clear errors to get car to start but still won't start my lap top does not have enough memory to get multiecuscan any suggestions would be appreciated
Whst errors was it showing?
Did they all clear..??
Did they all clear..??
Did you try the "motor tap"?
So you can see a code for low pressure.. and clear it
If the car is then seeing the pressure as ok ... something must have changed
So.. is power getting to the pump?
Did you say you paid £5,000 but it has no warranty..
This sounds wrong
Time to seek advice as to your legal rights with the dealer.
4 Month warranty but when i contacted them they would not process a claim because no service history been in touch with consumer services and phoning Trading standards in the morning i sent seller letters and text but no replies .