Technical Punto MK1 1.7 Tubo Diesel Code light on dash

[dlicheri]

Hi Gurus,

I have the following problem on my punto TD 1999 (T reg).

It ran just fine and started every time whether the dash code light (key above it) was on or off. All of a sudden it has started to play up. Intermittently the code light on the dash will not go off after inserting the ignition key and the car fails to start. Generally after a couple of goes, the light goes off and the car sparks into life. It seems to be getting worse and now has taken me over an hour to start it. Can anyone advise me on why this is happening? The problem is very intermittent and follows no particuular logical pattern. I have checked the hayes manual and there is no mention of an ecu for the punto turbo diesel . I have checked the righ offside inner wing and no sign of an ecu.

Can anybody help me with the following unanswered questions:

Is there a way to completelly disable the code check / immobiliser so that it starts every time?
If so who can do this (can i do it)? Contact info appreciated.

Is there an emergency startup procedure? what is it?

Where is the ecu located? where is the immobiliser located?

How do i test the pick up ariel located in the ignition switch?

Many thanks

dlicheri

 

[dlicheri]

Hello

I had a chat with Fiat Desira in southgate this morning. I have been told that the Punto MK1 1.7 TD does not have an ECU. The immobiliser (black box under dash next to fuses), has two connections:

1. connects to the transponder on the ignition key switch (two black wires)

2. connects immobiliser to the power source (black and red wires) and a further wires that go to a black box that sits on top of the diesel fuel pump (not considered an ecu) called thje FCU or fuel control unit.

Does anybody have details of the wiring diagram between the immobiliser and the control unit on top of the diesel pump?

Can anybody help out? There does not seem to be mucjh information about fiat punto diesels on the net, any pointers r further info is appreciated.

regards
dino

 

[dlicheri]

Can somebody out there help? There must be someone that knows a little about the 1.7 TD engine and code box/FPU set up.

Is there a way to reprogram the FPU so that it will accept any old code?

Thanks

 

[dlicheri]

Can anyone confirm this works:

----------------------------snip------------------------------------

I have bypassed many of these code systems. There is a three pin plug going to code control unit @ rear of pump unplug and smash of control unit taking care not to damage solinoid behind control unit. Remove 2 x shear bolts that secure control unit use vice grips once removed check which wire on the three pin plug that you disconected is the ignition supply (should be middle).

Solder to the wire on top of solinoid, tape up the 2 exposed wires left over , now disconect (large plug on code box next to steering coloum under dashboard, yellow-green or black in colour depending on year produced this stops code light from coming on) car or van will now start but you dont have an immobiliser.

Most mechanics will charge in excess of £300 to do this job. You can save stacks of cash by doing it yourself.

Best wishes
oily joe

-------------------------------snip------------------------------------

 

[dlicheri]

Nothing from anyone...... :worship:bahhhhhh ! there must be someone that knows about fiat td's out there...

pweeese help! I am stuck.

I feel like a one legged man in an arse kicking contest :bang:

 

[a1ant]

Hi mate, Only just seen this thread!!!!!! lol

Yes the immob/code system can be bypassed the exact way as you have described above. Bare in mind once its done you will have no immobilser though.

Do you have the red key?

And I know you said you hadn't in the first post, but have you checked the connection at the aerial, and at the code box where the aerial connects now??

Alan

 

[dlicheri]

Re: Punto MK1 1.7 Tubo Diesel Code light on dash - HELP!!

Thnnks for your response. Conforting to know that someone out there has time to respond.

I have the red key and one black key. Both keys work (when the immobiliser works), but once it packs up (intermittent) neither of the keys work.

I thought the problem only happened when the engine is hot, but i have been proved wrong. this morning i had the code light problem first thing. eventually, after removing key and re-inserting key a couple of times, it recognised the code and fired up.

Ariel / transponder and code box seem in good condition and connected. i have disconnected both connectors from code box and sprayed some wd40. did the same under bonnet. disconnected three pin connector that goes to solenoid on diesel pump and again sprayed some wd40 but problem persists.

any further advice appreciated or i'll resort to a hammer and chisel (lol).

:bang:

 

[dlicheri]

AAAARRRRRGGGGGHHHHHHH.........................:slayer:

ferkin thing wont start again this morning. Pain in the A55 ferking b1tc* of a ferkin punWan*1nt0.

HHHHHEEEEEEEELLLLLLPPPPP !!!!

 

[a1ant]

Lol hello again mate,

So just to confirm this id definitely happening from cold AS WELL as when warm?? And once its started its fine and doesn't cut out at all??

If its still in "no go" mode at the moment, try turning the ignition on, and then taping (fairly hard) the top of the stop solenoid. As its fairly common for them to stick on the 1.7. If its just sticking rather than knackered then taping it may just free it.

Alan

 

[dlicheri]

happens cold as well as hot. seems like it happens more frequently when hot. got really pi55ed off with 'the thing' this morning.

strangelly, after bitching and f'ing for half hour and a cup of tea, got in and she started straight away. :worship:

called fiat desira in southgate, and she is with good 'ol fiat now being diagnosed. it's gona cost but pointless having a car that wont start!

didn't try wacking the solenoid. i am sure fiat will give that a go! thanks for your help. will post results and prognosis from fiat as well as costs once i have'em.

dean

 

[dlicheri]

Just heard back from fiat desira in southgate and guess how much they want to fix it?

£840.00

What a joke !

 

[a1ant]

WOW... but what are they saying the fault is?? Im guessing they are saying new HP fuel pump??

Alan

 

[dlicheri]

They said the mechanic has diagnosed the fault. I need the following:

1. a new code box @ £130.00
2. a set of new keys (red as well as the others) @ £77.80
3. a new ecu on fuel pump @ £150.00
4. a new pick up @ £15.00
5. three hours labour @ £100.00 per hour

add 15% vat

What gets me is that they wanted to charge me £50.00 + VAT for diagnosing the fault. What the heck have they diagnosed? I could have told them that the fault could have been rectified by replacing the whole of the ignition and immobilising system including the fuel control unit.

the final insult was their refusal to provide me with the emergency start up procedure and code for my car. apparently it can only be used by a qualified fiat mecchanic.

they used the procedure to start my car up when i collected it. They denied having the code and refused to supply instructions on how to start the car in an emergency 'when the immobiliser breaks down' when asked.

all in all fiat desira at southgate came accross as UNHELPFULL and quite UNPROFESSIONAL. i am very very dissappointed with fiat especially Georgio and Pasquale and their manager at Fiat Desira in Southgate.

 

[reddy4bed]

I think I spoke to you earlier about this.
The immo is the most likely culprit. Fiat are throwing everything at the job to be sure of getting it right. The minimum you should need to by is the £130 immo, but if you could get one from a scrappy that could get it down to a tenner + the cost of setting it up.
Tony.

 

[dlicheri]

Fiat said the immobiliser and the fcu (fuel control unit) are matched. if you replace one you have to replace the other. what a waste! surely the immo can be reprogrammed.

does anybody have details on how to reprogram, the immo with a new code?



I promise to post full instructions as well as images of how to get your car on the road once i have sorted this one out. i feel like fiat have us all over a barel!

 

[dlicheri]

Need some info:

FCU (fuel control unit) on top of diesel injection pump has three wires (orange, green and brown). Which are the poser and earth and which is the data?

where can i get hold of the wiring diagram from code box to fcu? does anybody have it?

Much appreciated.

 

[whiterose]

you sound like your having fun and getting as much help as i will probably get on this matter lol!

sort of got a similar problem to you about wanting to disable the immobiliser. My reason for doing it is so i can stick the fuel pump off my new engine in the punto. ive been told my old fuel pump off the old engine is broken and as they are coded, the new pump wont match the car, or something to that effect!!

will get my the other half who is doing my engine to have a read and see if your previous posts help! thanks

 

[whiterose]

Can anyone confirm this works:

----------------------------snip------------------------------------

I have bypassed many of these code systems. There is a three pin plug going to code control unit @ rear of pump unplug and smash of control unit taking care not to damage solinoid behind control unit. Remove 2 x shear bolts that secure control unit use vice grips once removed check which wire on the three pin plug that you disconected is the ignition supply (should be middle).

Solder to the wire on top of solinoid, tape up the 2 exposed wires left over , now disconect (large plug on code box next to steering coloum under dashboard, yellow-green or black in colour depending on year produced this stops code light from coming on) car or van will now start but you dont have an immobiliser.

Most mechanics will charge in excess of £300 to do this job. You can save stacks of cash by doing it yourself.

Best wishes
oily joe

-------------------------------snip------------------------------------

I can confirm that this definately works cause we have just done it

 

[DIESELINJECTORS]

hiya all, can anyone help with this problem...see post below. i am trying to get my van started so i can use it as scrappage against a new panda!
I have bypassed many of these code systems. There is a three pin plug going to code control unit @ rear of pump unplug and smash of control unit taking care not to damage solinoid behind control unit. Remove 2 x shear bolts that secure control unit use vice grips once removed check which wire on the three pin plug that you disconected is the ignition supply (should be middle).

Solder to the wire on top of solinoid, tape up the 2 exposed wires left over , now disconect (large plug on code box next to steering coloum under dashboard, yellow-green or black in colour depending on year produced this stops code light from coming on) car or van will now start but you dont have an immobiliser.

Most mechanics will charge in excess of £300 to do this job. You can save stacks of cash by doing it yourself.

Best wishes
oily joe



I have done the above, although not sure about where the code control unit is! I thought the solinoid was on top of the pump and there is a control unit at end of pump. can anyone offer advice???

 

[gimmiemorefiats]

Glad to find this thread! I'm having exact same issue with my 2001 Punto HGT.

Did you get it sorted in the end? What was needed exactly? Full details would be massively appreciated. I'm stumped! :bang:

I've read about bypassing the immo, and it looks like a cunning bodge but i'd rather actually fix it.