Author Topic: Intermittent failure of immobiliser  (Read 630 times)

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sportiva

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Re: Intermittent failure of immobiliser
« Reply #15 on: July 28, 2018, 04:22:01 PM »
Thank you baz for your knowledge and experience, your willingness to share it is appreciated
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bazzbazz

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Re: Intermittent failure of immobiliser
« Reply #16 on: July 28, 2018, 04:27:52 PM »
Also earlier I asked if you could take the key apart to see if the chip was in the key, there was a good reason.

Many a time people lose the spare key, sometimes it can be expensive/difficult to obtain a working immobilizer chip for a new spare key.
So what many people do is get a new key cut as a spare, and so that both keys will work, they take the chip out of the working key and glue it to the underside of the ignition barrel against the Aerial Ring. This allows both keys to work as the immob chip is always present.

I was thinking that as everything was working fine you had a working immob chip, but maybe it had been glued to the underside of the Ignition Barrel, then had come loose and fallen away. But as I re-read your posts this is unlikely as it is obvious that the system suffered a progressive failure over a few days. If my above theory was correct the chip would have come loose and the system would have fully failed all in one go.

Just thought I would explain my post just in case you all thought I had gone off the rails. (again)  ::)
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Diamond Ric T

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Re: Intermittent failure of immobiliser
« Reply #17 on: July 29, 2018, 05:19:24 PM »
Thank you bazzbazz.
One day - a few weeks ago - I saw the IMMOBILIZ FAILURE dash warning. Upon trying a second time, everything worked so I disregarded the warning. slowly but surely, the problem came back. So goping from 1 fail to every 20 attempts, I went up to 50/50 and then, finally, 100%fail. My ALFADIAG program has reported an error in the transponder. Mr Minit keyman reckons almost surely that the key itself is losing power. I am going to take it (the key) over tomorrow to see if he can read a code from it. If he can, he can sell me a substitute key that hopefully will work. Fingers crossed.

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bazzbazz

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Re: Intermittent failure of immobiliser
« Reply #18 on: July 29, 2018, 05:33:53 PM »
In this case the Mister minute man does not know what he is talking about. The immobilizer chip in the key is PASSIVE!! The car interrogates the chip in the key, the chip is not powered in any way.

The battery normally contained in the 147/156 key FOB is for the remote central locking, not the immobilizer system. The problem in with the car, not the key.

ALFADIAG is simply saying it cant see the chip, usually due to

A/ The Aerial Ring failing. (They do on a regular basis)
B/ The connecting cable to the Body computer having a bad connection
C/ Faulty connection/Fault in the body computer itself.
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Diamond Ric T

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Re: Intermittent failure of immobiliser
« Reply #19 on: July 30, 2018, 05:26:00 PM »
Today I may (or may not have) lurched forward in this very frustrating immobiliser problem. The smart money was on the aerial ring that surrounds the key barrel. Today I took the one from my other 147 (which I know works) and put it on the non worker. I took the one from the non worker and put it on the worker. The worker still worked and the non worker still failed. Double blind test. Proves that it had nothing to do with the transponder aerial ring. I took the key to a locksmith and explained to him that it was a passive key. He tested it and said that it could not be read.  Dead as a dodo. I called an Alfa service centre here in Sydney and he said that the type of key that I had was notorious for "dying". (It is a blue key - made in Spain). He gave me an option. They can use the VIN of the car to identify the code and have a genuine replacement created. Not sure how much yet but he said maximum $500. Seems like it's pay the spondooly or the car goes to the boneyard.
ALFA 166 3.0 V6 2001
ALFA 156 2.0 TS Manual wagon 2001
ALFA 156 2.0 TS Manual sedan 2002
ALFA 147 2.0 TS Manual 5 door hatch 2003

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CitroŽnbender

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Re: Intermittent failure of immobiliser
« Reply #20 on: July 30, 2018, 05:45:36 PM »
If Vlad from Arese can't help, give Mick at Shop4Parts a call tonight. You should be able to get new genuine keys for a bit less overseas. 

Option B is an "immo off" procedure to the system, I'd think this is about £100-120 plus return post to the UK - not sure if I'd want it done locally, for a number of reasons.

bazzbazz

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Re: Intermittent failure of immobiliser
« Reply #21 on: July 30, 2018, 05:47:22 PM »
You got a photo of this "Blue Key" ?

The only way you can kill the immob chip for the 147 is to somehow smash the glass chip inside the key. Stood on the key lately?
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Diamond Ric T

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Re: Intermittent failure of immobiliser
« Reply #22 on: July 30, 2018, 06:19:02 PM »
Hi Bazzbazz
Here is a photo of the key. My great fear is that if I pay all the loot for a new key and it doesn't work.
ALFA 166 3.0 V6 2001
ALFA 156 2.0 TS Manual wagon 2001
ALFA 156 2.0 TS Manual sedan 2002
ALFA 147 2.0 TS Manual 5 door hatch 2003

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CitroŽnbender

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Re: Intermittent failure of immobiliser
« Reply #23 on: July 30, 2018, 06:27:35 PM »
Ric, I suggest you crop the photo to obscure the blade.  :)

bazzbazz

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Re: Intermittent failure of immobiliser
« Reply #24 on: July 30, 2018, 07:41:44 PM »
Gotta be honest, never seen a key like that, but find it hard to see how the chip in the key could "Die Slowly". You have to understand, the passive chip in the key either works or it doesn't, it's either broken or its not. The fact that yours had somewhat of a progressive failure, suggests logically that it must have something to do with a failure/faulty connection within the Body Computer.

Also you need a rather advanced reader to read the 147 chip, a standard reader won't read the chip. (Alfa Romeo being too bloody cleaver once AGAIN!)

Did you unplug/plug/clean the connecting lead from the aerial ring to the body computer where it connects to the body computer?
Did you check that lead for continuity?

Any Alfa wreckers in your area?

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