Technical No pulse on ignition coil, Punto 188.

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Technical No pulse on ignition coil, Punto 188.

Interceptor101

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Hi guys,

First off; English is not my native language, so I may sound a bit weird on some (technical) terms ;) Sorry for that.

Now the problem; my wife's Punto 1.2 60hp 8V from 2004.
Ingition coil B is the DTC.
Now this persists after replacing (for new of course) both coils and HP leads.
Swapping both coils over, still gives coil B as fault.
The coil does draw a spark when I loosen the HP lead, but a lot less than the one that does work.

The signal could be at fault as the positive connection on coil B does have 13,5V when connected and engine running.
Tonight, I can use a Scope; a Fluke 123 and so I will be able to see what signal comes down at the coil.
I can also see if there is a difference in the output from the ecu and input at the coil; making sure there is no wire at fault.
I also intent to make a temporary wire between both connections to see what happens, just to be sure.

So, it seems very much like the ecu is broken........
I have to find connection 10 at connector A on the ecu. Ehm, I didn't see an A or a B on them and so; who knows which one is the A connector on the ecu?
No biggie; I can try to see on which one the color is right.

But now;
If I have to buy a new ecu........
The key/start immobiliser won't work!
How do you guys "do that"?
Is it enough to just buy a second hand ecu with the transponder, just the little black "stone"?
Or do you know of any more "computers" working with that, like the computer for the interior or something like that?

Eh, sorry for the long read guys.
Please help me out here; it is going to be expensive........
Thanks in advance!
 
Hello,
It doesn't have to be an expensive fix but it does sound like the fault ain't simple to fix.
You didn't mention the spark plugs, have you had a look at them? maybe they short the coil B.

Second I'd recommend you (as you fiddled around with measuring voltage at the connector pins in my guess) to bent (VERY GENTLY) the pins in the Coil B so that the make a good and solid connection to the electrical plug that goes in them (the pins sometimes don't make a connection, and therefore you have a fault.)

Now that we're clear on those things, if you got a scope measuring device than you are very much likely to find the problem without having guesses. If you want my personal help I'd give you my phone but over mail could be fine, as I rarely come into this forum. I'll try to visit often to see if I can help.

About the scope:
you can measure the spark voltage at the coil and by this chart you can identify what you're missing:
secondary.jpg



When replacing the ECU, you HAVE to replace the immobilizer and key with that. at the scrap yard they'll tell you that aswell.
When
 
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