Technical Issues with fiat 500 engine light

[Amethyst4]

Hi everyone.

I’ve been having issues with my car (Fiat 500 -65 plate) with engine warning light coming on intermittently, telling me to check ESP, Hill hold unavailable, start/stop unavailible. Have taken the car into the garage a few times and they have tried clearing the codes but this hasn’t worked. I have also had oil and filter change, new spark plugs, and changed MAP sensor and used the specific map sensor electric spray. Unfortunately these haven’t resolved the issue either.

I have checked the codes myself p0101 and p0106.

A few times the car has started to go into limp mode and go very slow, the more I put my foot on the accelerator the slower it goes. I then have to turn my car on and off again for it to drive.

Any advice please? I have looked on this forum at other people’s issues and I wonder if it could be my evap. However I am unsure which wire to disconnect to test the evap. Is it the blue wire and how does this disconnect please?

Many thanks!

 

[A3jeroen]

That is not a wire, but a fuelline?
Sounds like a bad earthcable to me.

gr J

 

[jackwhoo]

The blue pipe is a tube from the evap canister at back of car to the evap solenoid valve in the inlet manifold.

The codes and driveability problems could be faulty evap valve . Disconnect the elbow for the blue tube from evap valve , plug the black pipe on the evap solenoid and test by driving.

To disconnect the elbow you may have to pull on the light grey ring? Be gentle because I am guessing type of retainer. Fingers crossed someone @koalar Will pop up and give first hand knowledge.

The hillholder etc warnings are often a faulty ground cable from the battery to body and on to the gearbox. Or a poor battery.

 

[koalar]

Take a look at my old posts I test the evap on the pand MK3 section

On a café WiFi at the moment

Answer properly when I get home in a few hours

Normally the car will run fine disconnect, the small amount of air can be coped with by the MAP and O2 sensors the only problem is if the fuel is in the evap system due to over filling, the extra fuel messes with the fueling

 

[jackwhoo]

Several people have identified the problem you are reporting by testing the evap valve by disconnecting the blue pipe and plugging the evap valve. It is so easy it is worth doing to rule out the evap valve being the problem.

 

[koalar]

Which engine

Test the evap

Pull the blue pipe off, leave the electrical connection on

Start the engine

No suction should be felt at the pipe

Disconnect the solenoid electrical connector

Start the engine a small vacuum should be felt

If this checks out we can move on

 

[jackwhoo]

Perhaps you could help with how to release the blue pipe elbow , is it just pull on the grey ring?

 

[koalar]

Quick release on the panda

Just squeeze the sides and it pulls off, unlike the fuel ones it normally not that tight

 

[koalar]

Here the two types of quick release used by Fiat

I don't know which type is on the 500

 

[jackwhoo]

With the grey ring type ( maybe same / similar to the fuel filter pipes on Ducato)
Push elbow towards valve then using other hand pull grey ring away from valve.
Can take a few tries /wiggling.

 

[Amethyst4]

Thankyou everyone for your advice, I will have a look into it and hopefully the problem will be solved.

 

[OldEngineer]

You know that multiple failures don't happen at the same time?
It will be the earth lead !!!

 

[steveras57]

If you have a set of battery jump leads you could test the earth by connecting one end of the black one to the battery negative post -and the other end to a good earth point within the engine bay! .
If that helps solve your problems then its certain that the main earth strap underneath the battery tray needs replacing!.

 

[koalar]

Any progress

Have you managed to remove the blue pipe yet

 

[Amethyst4]

Any progress

Have you managed to remove the blue pipe yet

Light hasn’t come on for a few days since I posted this after garage had a look and switched off the light. Im not very hopeful that it won’t come back on as it always does, but if/when it does I will be following your advice and check the evap then will check earth strap if no prob with evap. I will get back to you all if problem solved or not.

 

[steveras57]

Problems very rarely solve themselves! they just take time off to breed!.

 

[Derbyfella]

have you checked the earth lead?

 

[Amethyst4]

Warning light is back on. Code shows P0106. I have disconnected the blue wire and the evap port (where circled) is suctioning as soon as engine is turned on. Does this mean it is faulty and needs replacing?
I have used the car recently so car engine is still warm. Will redo this test in a bit when engine has cooled.

 

[Amethyst4]

Have you managed to remove the blue pipe yet

Yes, blue pipe removed. It was the pipe with the 4 parts to squeeze.

 

[koalar]

Leave the electrical connection on

Turn the engine on

Wet your finger and put it over the now exposed end

There shouldn't be any suction felt

99 out of 100 it's the only test needed as the normal failure mode is being jammed open from a bead from the evaporation container jamming open, if this fails you might have to flush the evap system to stop the new solenoid also getting trashed

You can do the same test with the electrical connector also removed there should be a slight suction felt this time

This would prove it's opening and closing correctly but not if the ECU is commanding it probably

Assuming these are okay you can double check by blocking the pipe and taking it for a few test drives,

If there's now no problems you can order a solenoid in confidence

I only know of a couple where some other work has been carried out and the whole solenoid hasn't been clipped back in properly

If the problem persist we need to do further diagnostics

I would not think you don't have an earth

p0101 and p0106 both a mismatch in pressure reading at the MAP sensor

There's quite a few possibilities, brake servo hose, inlet manifold distortion