Autel Reading Error

Motronic version?

 

I'm not Brian, Rifledriver is Brian.

I believe your scanner's lack of ability to communicate with Ferrari diagnostics of Motronic 5.2 and earlier, which your 99 is, is due to Ferrari's use of their proprietary diagnostic system i.e. SD 1/2/3 etc. and the fact that due to "Limited Production" status prior to 2000 Ferrari was not required to provide OBDII diagnostic information other than emission related codes which start with P0, as in P0123.

 

Does the ap200 at least give you data streams from the associated sensor..that to me is key.

Sent from my moto g power using Tapatalk

 

Get friendly with a shop that has an SD1/2/3, as far as I know that's the only way to properly diagnose a 550.

 

My Actron scanner reads data streams from both ECU's and they are accurate, I suspect the Autel does as well.

For example I can see in real time when the Secondary stops and the fuel system changes from open loop to closed loop. It says 90 something but it's reading both ECU's

I think there are something like 45 data streams that I can monitor in real time, it's just the code definitions that you cannot trust to be accurate.

 

It is Motronic 5.2, not the production year of the 550 that determines what can be read. For the 5.2 Motronic Ferraris, you can read the emissions related codes like Dave said, but most of the rest of the ECUs used serial connectors, with which the SD1, SD2, and SD3 came equipped. OBDII was required on US cars after 1 January 1996. Ferrari initially did not make their OBDII connector compatible with anything except factory diagnostic equipment. EPA jumped on them very quickly about that and it resulted in the tech bulletin you referenced. Hard to believe yours did not already have a compliant connector already since it really was only a problem on early US 5.2 456s and 550s. Not sure when Europe jumped on the OBDII bandwagon, which they eventually did.

 

Europe versions of the 550 have the 3 pin connectors next to the motronics, and my Autel 519 can read the 1998 motronics with an 3 to OBDII adapter and a 12v connection.
But only motronic info, such as live O2 data, MAF values and rpm.
I do not think a 16 pin direct OBDII would give more info than this.

 

My Autel MaxiSys Elite won't connect to the 2001 550 I have in the shop. If I try as "generic OBD2", I get a message that it identifies it as a Ferrari, it reads the codes and gives some live data.