General 04 Stilo keeps going into limp home mode P0220

Currently reading:
General 04 Stilo keeps going into limp home mode P0220

olly0404

New member
Joined
Nov 3, 2009
Messages
25
Points
7
Location
Wirral
Hi
I'm having the same problem that a lot of jtd owners are having.04 stilo jtd mw 121000 miles.Drives great then goes in limp home mode and loose connetion on dash.I have Ecuscan 2.6.1 scan came up with P0220 an air con fault and a pre heat fault was working fine with seconed two faults untill I went to the car wash.I don't have underside plastic tray on the car,engine light came on as the carwash washed the underside of the car.I've had this fault before always seem to be in the wet.Got new peddle and good bocsh battery last time didn't solve it last time just went on holiday and worked fine when I got back for the last 4 months.I think it just dryed out.Checked earth pionts that I could find,checked and cleaned fuses and D4 by battery.Even had laptop next to me with a friend pressing F10 on Ecuscan resets and gives me power back but fault P0220 still showing.Sometimes key out start it up again will get me out of limp home mode.Any Help would be appreciated.Thanks for your time Olly
 
Forgot to say also had new brake switch about same time as battery about 6months ago.The other strange one is when it goes into limp home mode if I put the car into reverse the revs come back then go when I put it 1st Gear back to limp home mode oh yes reverse lights not working.
Thanks
Olly
 
Last edited:
Check the earth points with a multimeter (There is a topic in the guides section) and if youve had it power washed i believe its normally the crack sensor which is above one of the wheel arches drivers side i think can cause problems. Goodluck.
 
Update-Had a check of the earths sorry no multimeter think got them all cleaned d4 checked fuses ?
now getting on Ecuscan

P0220- Accelerator pedal sensor 2 -signal high

P0530- AirCon pressure sensor (always been there)

P0380- Board relay,thermostarter or preheat ECU

U1601- Can messages TX(C-CAN)

U1706- Engine >ABS Data line

U1700- CAN:Body Computer conn. fault (1)

Starts up Can rest P0220 , P0530 come back ?Drove it back from a friends was fine but dash was going Crazy
Anyone Help me ?
TA
 
Quick update I have now got my baby working agian all I did was check my brake switch.I pulled the plunger pin on the switch out and reset it with 1mm gap fixed ! Engine managment went out afther three good starts Ecuscan cleared P0220
I still getting a the odd engine managment light only in the wet but goes after its drys out ? still not sure why but have a feeling it has something to do with the plastic under tray missing.

Thanks for all Posts and Guides that have helped.
 
Loose connection and Car Security Failure

Help Loose connection error and the Car wont start. The message appeared after Car Security Failure message.
I've been to Fiat dealer very helpfull guy plug his computer in for free cleared all the codes same problem.He thinks it may be the ECU is not talking to the key.I fitted new pick up ring cheapest place to start £5.80 still no joy have check all the earths , D4, cleaned with connetion cleaner.I'm all out of Ideas sick of Fiat intermittent electrical faults :bang:
1.9 jtd stilo 04
P0220 still read my other posts turn out to be brake switch but is back
https://www.fiatforum.com/stilo/257520-04-stilo-keeps-going-into-limp-home-mode-p0220.html
U1600
U1700
 
Last edited:
Re: Loose connection and Car Security Failure

Moved this here to your original thread, best to keep all the information in the same place. (y)

Most likely candidate is still the D4 connector, did you disconnect it before using contact cleaner on it?

Do you have the battery cover on the car? if the problem is water ingress related, it could be water getting into the grey fuse box at the back of the battery. This would throw up various warnings.

Does the car never start? or did it start just enough to get it to the Fiat dealer and back?
 
Last edited:
I'd put a new brake light switch in there. They're quite cheap and not too difficult to replace. You know there's a problem there. If the switch shows constant brake ON and you go on the gas then you get a P0220 -gas pedal signal- and limp mode because car can't work out what want. There's two switches inside and the switch can show on and off at the same time when it starts playing up which confuses the ECU and they're not very robust switches

P0530 is more often aircon low gas but otherwise a pressurestat circuit problem

Once your D4 is bone dry then wrap it up and protect it with cling film. If it's exposed then don't do pressure car washes
 
Last edited:
Re: Loose connection and Car Security Failure

Hi
thanks for your help. Yes I disconnect D4 before using contact cleaner and hair dryer.
Yes I have top battery cover on. The grey fuse box at the back of the battery I have checked fuses and swaped relays around made sure they where the same as the one I was swaping (good tip use you Phone take pic before swaping fuses and relays).have done brake switch before ?
The car did start once after I got Car Security Failure had to tow it to dealer .The good man at Fiat try his box of tricks no joy he said it could be pick up ring Done that still nothing.So we got 5 fig Code from Fiat ( needed log book for that he tryed that it cuts out the body computer and should start.still no joy.Fiat Man said the ECU not getting the Code?
Thanks agian
 
Update The 5 fig code from Fiat was (42711) may help someone.
I'm still looking for help with Car Security and Loose Connection.
Took battery off to charge today before anyone says I need a new one its not that old and tests fine and removed Grey Fuse Box so I can clean and dry it out in the house Photo may help someone.(if any one needs photo's of D4,fuse box,body computer etc let me know)
Photo0097.jpg
Thanks :worship:
 
You need to find the source of this lost connection the car is warning you about.
immobiliser JTD.JPG
For car security-immobiliser- then car relies on CAN line communication between body computer and the ECU

body comp jtd 2.JPG
so a starting point might be to remove all BC connectors, clean with electrical contact cleaner, inspect and refit. Do the same to the ECU connectors

gas pedal wiring jtd.JPG
You have an ongoing gas pedal circuit problem causing P0220 which is probably a totally separate issue. For that you need to trace whether the 5v supply, earth and signal wiring is good at the ECU from the gas pedal potentiometers. it has two potentiometers so each will have a 5v supply, earth and a signal output moving somewhere between 0.5v to 4.5v as gas pedal is moved and car is saying something is wrong with potentiometer circuit no 2. All supply, earth and signals go through D4 connector but if you check signal voltages at the ECU connectors then you can eliminate D4. People have complained of a a loss of 5v supply to one of the gas pedal pots through an internal circuit problem in the ECU
 
Last edited:
Thank you so much Deckchair5.:) I've got body computer out now not for the first time and had the two ECU connections off other day all looks clean? I have another connection next to D4 looks the same only has 3 pins in it ?I will give it all a good claen and spray with contact cleaner tomorow. Fingers Crossed
Thanks
 
Re: 04 Stilo Jtd U1600 Immobilizer Key fault

Update cleaned and put it all back together found a bent pin on the body computer last night was hoping pin 32 ? fixed pin. I,m getting codes P0530(AirCon Pressure Sensor)always had that one P0380(Heater Plug) that was there before Xmas. U1600(Immobilizer Key fault) Still got rid of the P0220 its a start
Thanks Agian
 
Latest update no joy tried swapping relays got few new one from nice man at fiat dealer must say Windsor’s Fiat(Wirral) very helpful. Any more help would be appreciated.
 
So you clear the fault codes and U1600 pops up straight again at key on?
U1600 is often to do with the key aerial pick up ring and the connector there to the body computer but you say you've changed that?
Do you have a number of keys on your key ring?
How many keys do you have for the car and have you tried a different key to see if the key immobiliser chip is faulty?
Does it ever sporadically accept the key code and start?
Is the key fob part damaged at all?
Is the part with the immobiliser chip close enough to the pick up ring?

If it just won't accept the key immobiliser code then it may need to be reprogrammed to accept that immobiliser again
 
Last edited:
Hi Thanks for your help again(y)
Yes when I clear the fault codes and U1600 pops up straight away.
I've got 2 keys tried both also tried moving pickup ring around the key.
I'm not to good on techy drawings I've got eLearn would be helpful if I knew which pins on the body computer and Ecu the pick up ring go to.
The car has only started once since it stop 3 weeks ago.
From what Fiat Dealer said Ecu not accept the key code,key fobs are both un-damaged.
Thanks:worship:
Olly
 
Last edited:
I've got eLearn would be helpful if I knew which pins on the body computer and Ecu the pick up ring go to.

Olly

Deckchair5 has already posted the wiring diagram. It's the first diagram in post #11 above.

P91 is the pick up ring, M1 is the Body Computer. The wires from the pick up should be White/Grey (White with a grey tracer) and White/Brown. They go to pins 4 and 5 respectively of the BC connector A.

Once the BC has recieved the correct code, it will send a serial line signal from pin 29 of connector B to enable the engine management ECU (M10)

Try disconnecting, clean with electrical contact cleaner and refitting the engine management ECU connector.
 
Last edited:
I'm sure I've read a thread here somewhere about someone who ignored his worn engine mounts. The extra engine movment made a cable/cables wear away where it passed through the bulk head causing a short. Could this be a similar issue because the errors are similar.

Can't find the thread now. :(
 
Last edited:
Thanks for all your help ,I've given up off to auto sparks tomorrow will post results when I get it back looks like new ECU I hope not
Thanks again :worship:
 
Back
Top