Technical The 'won't start, key code light stays on' problem

[Graeme09]

Morning all.

My boy has a 1.7 turbo diesel Punto SX, N reg with the 'won't start, key code light stays on' problem.

I posted about it in the newbie section but now I know a bit more about both Puntos and Forums, I've started this post with more information.

The car starts some days but not others for no apparent reason so we just want to disable the immobiliser and get on with life!

I think I have found the answer in this thread: https://www.fiatforum.com/punto/181978-punto-mk1-1-7-tubo-diesel-code-light-dash.html

With these instructions:

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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

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There is a solonoid under the bonnet just behind the battery but I didn't want to smash the control unit on top of it and start soldering wires incase it ain't the right one!

The bottom of the solonoid has red and brown 4mm or 6mm sized wires bolted to it. The plug on the top control unit has 5 wires: 1. violet/black - 2. blue/white - 3. orange/black - 4. red/black - 5. blue/red.

Can anyone who has disabled their immobiliser tell me if I'm looking at the right component to take my hammer to and where I should re-connect the control wires?

Cheers

Graeme

 

[MikeSalt]

Are you pushing the key all the way in before turning it? I noticed a correlation between not pushing it in as I turn and the code light staying on, particularly in warmer weather.

 

[Graeme09]

Cheers Mike

I'll try that one

Regards

Graeme

 

[NumanR]

Thats the wrong solenoid G09, the solenoid is on the fuel injection pump behind the immobiliser unit.

 

[Graeme09]

Wow! Cheers for that NumanR, I had my hammer in my hand, I was just about to smash the wrong solonoid!!!!!!

There's a yellow box under the dash, accessible from the driver's foot well which I thought was the immobiliser unit but I can't find anything that is as described under the bonnet. I'll have a look for the fuel injection pump and I'll keep the hammer safely in the tool box till I'm sure!

 

[NumanR]

Just seen your original post G09 in Newbie section, you said there that engine wont turn over. The immobiliser does not stop engine cranking so you may be barking up the wrong tree entirely. If you have a power problem then its possible the immobiliser light is on as a symptom not the fault itself. Find out why it wont crank first.

 

[Graeme09]

Cheers again NumanR

I'll phone my boy later and confirm that is the case. The details were a bit patchy when I first started looking into it.

If the engine turns over I'll get the immobiliser out. If not I'll test as many of the connections as I can. Then I'll post back

Regards

Graeme

 

[Graeme09]

Yeah, forget that, newbies are so dumb!

The starter motor still cranks the engine but it won't start and the key code light stays on.

The car started last night but then it packed up again so it's stuck away from home again now!

Graeme

 

[gimmiemorefiats]

Yeah, forget that, newbies are so dumb!

The starter motor still cranks the engine but it won't start and the key code light stays on.

The car started last night but then it packed up again so it's stuck away from home again now!

Graeme

Did you get this sorted in the end? I'd be interested to know the outcome as i've got the code warning light on my 2001 HGT and don't trust myself to smash the right bits off the car to disable the immobiliser...

 

[D4nny8oy]

The 1.7TD in a mk1 has nothing related to your car. Smashing things won't solve any of your problems.

 

[s and b]

The 1.7TD in a mk1 has nothing related to your car. Smashing things won't solve any of your problems.

oh i dont know
i love smashing things