Speedometer problem

Bart · 05-21-2012, 09:34 AM

I was driving around 75 in my 550 on the freeway. I noticed out the corner of my eye, the speedometer needle dropped to zero mph and then back to 75. Nothing else happen. The engine did not miss a beat, the rpm needle was steady, and nothing else was wrong. These happen about four or five times within 5 minutes. It did not happen again for the next hour.

Does anyone have any ideas as to what happen?

Granucci · 05-21-2012, 09:47 AM

Sensor. Cleaning or replacement. Not a big deal. Taz?

tazandjan · 05-21-2012, 11:13 AM

Rik, Bart- Sounds like a loose connector somewhere. I do not actually know where the speedometer signal originates on a 550. On the 575M and 360, the Motronic ECU determines speed by looking at engine speed and an angular speed sensor on the transaxle case. I am guessing the 550 is similar. Maybe one of the pros knows.

Boxer · 05-21-2012, 01:00 PM

Or loose connection.

Bart · 05-22-2012, 01:59 PM

Thanks

05-21-2012, 09:34 AM	#1
Bart Owner Join Date: May 2002 Location: Orange County, Calif. Ferrari Life Posts: 1,651	Speedometer problem I was driving around 75 in my 550 on the freeway. I noticed out the corner of my eye, the speedometer needle dropped to zero mph and then back to 75. Nothing else happen. The engine did not miss a beat, the rpm needle was steady, and nothing else was wrong. These happen about four or five times within 5 minutes. It did not happen again for the next hour. Does anyone have any ideas as to what happen? 12 cylinders or walk

05-21-2012, 09:47 AM	#2
Granucci Owner Join Date: Jan 2007 Location: far and away Ferrari Life Posts: 5,908	Sensor. Cleaning or replacement. Not a big deal. Taz? Guide to the Galaxy: Don't Panic Rik -- LAH ! Current: 1990 Mondial T Cabriolet : Red/Tan 1995 456 GT 2+2 : Roso Metalizzato [Fer 311/C] & Tan

05-21-2012, 11:13 AM	#3
tazandjan Owner Elite Member Join Date: Aug 2011 Location: Albuquerque, NM Ferrari Life Posts: 7,449 Name: Terry H Phillips	Rik, Bart- Sounds like a loose connector somewhere. I do not actually know where the speedometer signal originates on a 550. On the 575M and 360, the Motronic ECU determines speed by looking at engine speed and an angular speed sensor on the transaxle case. I am guessing the 550 is similar. Maybe one of the pros knows. 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.

05-21-2012, 01:00 PM	#4
Boxer Owner Elite Member Join Date: Apr 2004 Location: UK Ferrari Life Posts: 14,891	Or loose connection. Boxer Current: F40, F50, 430 Scuderia Past: 612 Scaglietti, 360 Modena, 360 Challenge, 550, 575, 365BB, 512BB, 456 GT, F355 GTS, 365 GTB/4 Daytona, 308 GTB

05-22-2012, 01:59 PM	#5
Bart Owner Join Date: May 2002 Location: Orange County, Calif. Ferrari Life Posts: 1,651	Thanks 12 cylinders or walk

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