Can anybody tell me if this system (fitted to early Mondial t) has a "learning" process, or memory? Most modern cars monitor the engine and "learn" various settings for operation, and are able to adjust fuelling etc to optimise running, and then memorise them. I wondered if the Motronic 2.5 has this ability to fine tune itself. The reason I ask is that I disconnect the battery when I put the Mondial away, and on modern cars this clears the ECU memory, which can then take a while to optimise itself again.
Martin- Go to this website and download a 348 workshop manual. There is an entire section on the Motronic 2.5 injection ignition system. http://www.ferraridatabase.com/The_Downloads/Downloads.htm Taz Terry Phillips
Thanks for the information. I had a look but it's not clear about whether the ECU holds data, and if it loses it when the battery is disconnected for a time. I have a Ford Transit Connect van bought new in 2008 and if you disconnect the battery for more than a couple of hours the ECU resets and it takes about 20 miles of driving for the van to run properly again.
The late Motronic 1.x systems have adaptive capabilities (which clear once power is removed). I don't know about 2.5 specifically, but...
Yes, that system has self adaptation for fuel/ignition map, idle control and emissions monitoring. When you disconnect the ecu from battery +, adaption is lost. It relearns on subsequent drive cycles. cizeta
I'm not totally sure on the 2.5 but on the 2.7, yes it does have learned parameters, and yes they do get cleared when you disconnect the battery. Which is why you need to let the car relearn the warm up parameters when you first start up the car after the battery has been disconnected/reconnected. It will also "learn" and store more info as you drive the car. But again, once the battery gets disconnected the learned memory gets cleared.
Is there a procedure for "relearning the warm up procedures" after the battery has been disconnected or do I just drive the car normally? On my van you are supposed to let it idle for a few minutes and then hold it at 1200rpm for a minute etc, but if you don't do it, the system sorts itself out anyway, it just takes a day or so instead of immediately. I'm going to leave the battery connected on the Mondial in future.
Relearn procedure: 1) Start car 2) turn off A/C and fans 3) touch none of the controls 4) wait for 10 minutes after the engine cooling fans cycle the first time 5) done.
Thanks for the advice I did not follow this procedure, but I started the car from cold and left it to idle for 10 minutes, then drove it normally. Should I warm up the engine, disconnect the battery, and then reconnect it and follow this instead? Having said that, the next time I used the car, it ran better particularly during the warm-up cycle.
Martin- No, that procedure is if you need the quickest relearn of the DME parameters. If you had just started it and driven off, over the next few times you drove it, it would have relearned all the parameters at any rate. Might have been a little rough while doing it, but no harm done unless you tried to pass an emissions test. Best never to take one to have the emissions tested after recently turning off the battery. Incidentally, if you do the 10 minute relearn, turn off the A/C and radio before you start the engine. There was a much more complicated run cycle test developed by Ferrari for the 360 (7.1.1 DME) and the 575M (7.3 DME), but by the time the F430 came out (7.3 DME), it was back to the 10 minutes idling, which works well enough and is easy to remember. Taz Terry Phillips
