Speedometer/ Tach issue - LotusTalk

Bender Rodríguez · 08-04-2009, 10:00 AM

So does anyone know what sensor the ecu uses to determine the vehicles speed. Looking at the diagram at first I though it was the ABS wheel speed sensors but that doesn't appear to be the case. Currently I think I have whatever sensor it is unplugged and the tach now cuts out the second I go above 2500rpm. Any help would be awesome.

apk919 · 08-04-2009, 10:41 AM

I'm confused by your problem... if it's a tach problem the ECU get it's RPM information from the crank sensor, so speed sensors have nothing to do with it.

MaineLotus · 08-04-2009, 11:07 AM

Speedo uses the wheel speed sensors, also shared by ABS.

Bender Rodríguez · 08-04-2009, 09:18 PM

Ok it wheel speed sensor unplugged. Fixed both issues.

Thanks for the help

Bender Rodríguez · 08-20-2009, 06:05 PM

Ok so the tach is still cutting out the second I go above 3k rpm's. and when I did back below it kicks back in immediately. Any ideas???

speedycar · 08-20-2009, 06:31 PM

The same thing happened to mine within the first year. The dealer replaced the whole instrument cluster. Problem solved.

Bender Rodríguez · 08-22-2009, 05:18 PM

Quote:

Originally Posted by speedycar

The same thing happened to mine within the first year. The dealer replaced the whole instrument cluster. Problem solved.

Sadly no, outside of the ecu I'm not sure what it could be.

Any ideas?

Bender Rodríguez · 09-23-2009, 10:04 AM

Ok so I'm still having an issue with the Tach cutting out. Anyone have any ideas???

08-04-2009, 10:00 AM	#1 (permalink)
Bender Rodríguez Registered User Join Date: May 2008 Posts: 356	Speedometer/ Tach issue So does anyone know what sensor the ecu uses to determine the vehicles speed. Looking at the diagram at first I though it was the ABS wheel speed sensors but that doesn't appear to be the case. Currently I think I have whatever sensor it is unplugged and the tach now cuts out the second I go above 2500rpm. Any help would be awesome. __________________ www.thompsonracingfabrication.com Compressor Map xls http://www.lotustalk.com/forums/f160...mapping-76110/ Roll Center xls http://www.lotustalk.com/forums/f91/roll-centers-76108/ 1891lbs ???Whp Tq

08-04-2009, 10:41 AM	#2 (permalink)
apk919 ΒÄŅNED Join Date: Oct 2007 Location: Limbo Posts: 6,281 Images: 20	I'm confused by your problem... if it's a tach problem the ECU get it's RPM information from the crank sensor, so speed sensors have nothing to do with it. __________________ * 2009 Lotus Challenge Series Rookie Of The Year * (Thanks Jim, Tom, Jack, Rob & Spring Mountain Motorsports Ranch!) My videos: http://www.youtube.com/user/apk919

08-04-2009, 11:07 AM	#3 (permalink)
MaineLotus Parts scattered about... Join Date: Feb 2005 Location: Maine Posts: 1,385	Speedo uses the wheel speed sensors, also shared by ABS. __________________ My car is modified.

08-04-2009, 09:18 PM	#4 (permalink)
Bender Rodríguez Registered User Join Date: May 2008 Posts: 356	Ok it wheel speed sensor unplugged. Fixed both issues. Thanks for the help __________________ www.thompsonracingfabrication.com Compressor Map xls http://www.lotustalk.com/forums/f160...mapping-76110/ Roll Center xls http://www.lotustalk.com/forums/f91/roll-centers-76108/ 1891lbs ???Whp Tq

08-20-2009, 06:05 PM	#5 (permalink)
Bender Rodríguez Registered User Join Date: May 2008 Posts: 356	Ok so the tach is still cutting out the second I go above 3k rpm's. and when I did back below it kicks back in immediately. Any ideas??? __________________ www.thompsonracingfabrication.com Compressor Map xls http://www.lotustalk.com/forums/f160...mapping-76110/ Roll Center xls http://www.lotustalk.com/forums/f91/roll-centers-76108/ 1891lbs ???Whp Tq

08-20-2009, 06:31 PM	#6 (permalink)
speedycar Registered User Join Date: May 2009 Posts: 5	Warranty? The same thing happened to mine within the first year. The dealer replaced the whole instrument cluster. Problem solved.

09-23-2009, 10:04 AM	#8 (permalink)
Bender Rodríguez Registered User Join Date: May 2008 Posts: 356	Ok so I'm still having an issue with the Tach cutting out. Anyone have any ideas??? __________________ www.thompsonracingfabrication.com Compressor Map xls http://www.lotustalk.com/forums/f160...mapping-76110/ Roll Center xls http://www.lotustalk.com/forums/f91/roll-centers-76108/ 1891lbs ???Whp Tq

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