456M immobilizer bypass - Ferrari Life
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post #1 of 31 Old 01-15-2015, 04:46 AM Thread Starter
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456M immobilizer bypass

I've read a thousand posts on the impossibility of bypassing the immobilizer but decided to have a look at the circuit and components. The 456M doesn't have a true wiring diagram but a block diagram with plug and pin locations so with the help of those and tracing wires I got a pretty good idea of how the system works and its complicated even for a electronic tech like me. Seems the immobilizer sees a signal from the fob and if the codes match it turns on a relay in the immobilizer enabling the start relay and produces a signal to the immobilizer interface which in turn sends a digital signal into a processor built into the Motronics EFI ECU on pin 56 of both left and right ECUs, when the ICs built into the ECUs sees the correct digital signal it turns on the relays for the left and right injection and ignition supplying voltage to the injectors and coils. A simple thought would to be just jumper relays for start coil and supply voltage and it would work but it will not. The injectors and coils are trigger by grounds (a negative signal) which comes from high current switching ICs which are turned on by the IC that gets the signal on pin 56 of the motronics ECUs. In short I spoke with a tech at ecudoctors.com which rebuild motronic ECUs, and the secret is to find the input to the ICs which turn on the ignition and injection and supply them with a constant signal, plus bypass the start relay located in the immobilizer unit. I opted to send the entire system to ecudoctors and let the pros look at it. Will keep you posted. I know there are many who would not agree with my wish to eliminate the immobilizer but to each his own, I don't like it and don't like being held captive by a 4 digit code and a fob. Which brings to question, where are all the original fobs since there are so many guys with just one? Seems they would not be any use to anyone but the owner of the car. Must be a pile of them someplace.

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post #2 of 31 Old 01-15-2015, 05:35 AM
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Jack, good on you for trying to sort this. It's something Dave & I have considered looking at too, but have had our hands full with other things lately.

I hope the ECU docs can come up with something.

About the original fobs laying around; it's unfortunate, but you always see a few for sale on eBay, and I can't help but wonder how many of these weren't included in the vehicle sale, and how many "new" owners have missed out on getting all the original fobs for their cars?

There was a guy who posted recently that he's trying to find the new owner of his old Ferrari so that he can "sell" him the additional fobs. Why didn't he include them in the sale? These really ought to be gifted to the new owner

'99 550, Rosso Corsa / Nero, S/N:114654, Assy: 31836, Engine: 52084

High mileage, low compression, and missing on a few cylinders.....just like my cars.

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post #3 of 31 Old 01-15-2015, 05:57 AM Thread Starter
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Quote:
Originally Posted by cribbj View Post
These really ought to be gifted to the new owner
Amen to that!

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post #4 of 31 Old 01-15-2015, 08:07 AM
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What gets me is also all the owner manuals being held hostage on ebay that came with the cars

Keep the car as one

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post #5 of 31 Old 01-17-2015, 06:29 PM
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Is the 456 a Vette killer?

Hows about a general report on this model? Yo Da Man!
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post #6 of 31 Old 01-18-2015, 03:20 AM Thread Starter
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Reg they received all the components on Thursday, no report as of yet but I must say I can't wait to find out the results.
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post #7 of 31 Old 01-18-2015, 10:14 AM
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Jack- Did you send them a Motronic ECU, too? The other piece of the puzzle is that the Alarm ECU passes a clear to start signal to the Motronic DME that must match what the Motronic has stored in memory.

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post #8 of 31 Old 01-18-2015, 01:38 PM Thread Starter
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Yes, both ecu's and the immobilizer plus immobilizer interface.
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post #9 of 31 Old 02-27-2015, 02:56 AM Thread Starter
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An update, that clear signal that you mentioned Taz is coded as you said and from what was explained to me comes in the form of lines of information, example a-z, on Porsche immobilizer the information to start the ignition sequence could be on line U and the fuel injection on line R and they know what to do to bypass after they find which line has which information. The motronics ecus are the same but the line of information are different between Ferrari and Porsche. One of the big hold ups is they didn't want to damage my system I sent by experimenting with it, I thought that was thoughtful so I purchased a complete additional system from a totaled 456M and gave them the go ahead to do what ever. Once they find those lines of information this will open up the doors for everyone who wants to bypass the push button fob. The turn around will be a couple days. They sent me this short clip of the motronic unit in operation, the motronics test unit is awesome. https://www.dropbox.com/s/ezoe08mx14...13221.mp4?dl=0

For you geeks like me look to the left of the flashing lights, you will see where they can dial in O2 sensor voltage inputs, in closed loop operation it will change injector pulse width and throw engine check lights which I assume they can watch. Cool test unit.

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Last edited by P2164; 02-27-2015 at 03:03 AM.
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post #10 of 31 Old 02-27-2015, 09:28 AM
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Jack- Sounds like they are making progress. The PIN is memorized by the right Motronic DME and the signal sent by the Alarm ECU must match that PIN. If you swap alarm boxes for new ones with a new PIN, it is necessary to swap the virgin left Motronic DME or buy a new Motronic ECU or she will not start. One other thing to bypass.

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Every day I look around, and if nobody is shooting at me, it is a pretty good day.
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post #11 of 31 Old 02-27-2015, 10:28 AM Thread Starter
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Quote:
Originally Posted by tazandjan View Post
Jack- Sounds like they are making progress. The PIN is memorized by the right Motronic DME and the signal sent by the Alarm ECU must match that PIN. If you swap alarm boxes for new ones with a new PIN, it is necessary to swap the virgin left Motronic DME or buy a new Motronic ECU or she will not start. One other thing to bypass.
Good information Terry, I will remember this! So when the new immobilizer and ecus (from the same car) show up and after installation it doesn't start swap the ecus, correct?
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post #12 of 31 Old 02-27-2015, 10:30 AM
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Jack- Affirmative, and hope somebody else did not already do that. Odds are they did not.

Taz
Terry Phillips

Present: 575M 135171
Past: Dino 246 GT 02984, 365 GTB/4 14009, 308 GTS 25125

Every day I look around, and if nobody is shooting at me, it is a pretty good day.
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post #13 of 31 Old 02-27-2015, 12:27 PM
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Quote:
Originally Posted by tazandjan View Post
The PIN is memorized by the right Motronic DME and the signal sent by the Alarm ECU must match that PIN. If you swap alarm boxes for new ones with a new PIN, it is necessary to swap the virgin left Motronic DME or buy a new Motronic ECU or she will not start. One other thing to bypass.
Taz, I think what you said may be true for the later generation Motronics, but on the 5.2's that Jack & I have, I don't think it's entirely correct.

During the development of the Cat ECU replacement, I was testing an industrial thermocouple signal converter, and at startup, for a second or two it put alternator voltage on the 5v cat signal input of my right hand 5.2 Motronic, and let the smoke out

I then replaced the hosed Motronic with a used unit from a salvage 550, and it worked fine, with no immobiliser or alarm issues.

'99 550, Rosso Corsa / Nero, S/N:114654, Assy: 31836, Engine: 52084

High mileage, low compression, and missing on a few cylinders.....just like my cars.

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post #14 of 31 Old 02-27-2015, 06:35 PM
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John- 50-50 odds you got a left Motronic ECU.

Taz
Terry Phillips

Present: 575M 135171
Past: Dino 246 GT 02984, 365 GTB/4 14009, 308 GTS 25125

Every day I look around, and if nobody is shooting at me, it is a pretty good day.
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post #15 of 31 Old 02-28-2015, 01:07 AM
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Quote:
Originally Posted by tazandjan View Post
John- 50-50 odds you got a left Motronic ECU.
That's a possibility!

'99 550, Rosso Corsa / Nero, S/N:114654, Assy: 31836, Engine: 52084

High mileage, low compression, and missing on a few cylinders.....just like my cars.

Maranello Skunkworks Team Member
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post #16 of 31 Old 02-28-2015, 03:10 AM Thread Starter
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John, Terry, has anyone ever bypassed the immobilizer? I've read some posts from programmers who own Ferraris on this site and they mention the code but no one has confirmed it being done. Or am I missing something?

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post #17 of 31 Old 02-28-2015, 04:20 AM
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Jack, I've not heard of it being done yet.

'99 550, Rosso Corsa / Nero, S/N:114654, Assy: 31836, Engine: 52084

High mileage, low compression, and missing on a few cylinders.....just like my cars.

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post #18 of 31 Old 02-28-2015, 04:45 AM Thread Starter
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John I might be just burning dollars, we will see.
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post #19 of 31 Old 02-28-2015, 05:23 AM
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Originally Posted by P2164 View Post
John I might be just burning dollars, we will see.
Keep at it Jack, I don't think the planets have ever been this close to aligning.

I think/hope you'll be able to pull this off.

'99 550, Rosso Corsa / Nero, S/N:114654, Assy: 31836, Engine: 52084

High mileage, low compression, and missing on a few cylinders.....just like my cars.

Maranello Skunkworks Team Member
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post #20 of 31 Old 03-17-2015, 06:40 PM
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Jack,Ive got the unit from a qv Mondial C,,,bent valves,,unit out,,,,pics coming.$25,,,,decent Car and cool project.No hurry and fair price.Perfect for Pizza......Owner wants me to "place Car"...
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