Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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jenserik
Jens Nielsen

(1 posts)

Registered:
07/03/2013 03:32PM

Main British Car:
Rover 14CUX Electronic Fuel Injection
Posted by: jenserik
Date: July 03, 2013 03:58PM

I wonder what the purpose the "Road speed input" has to the system?


lars49
Larry Barnes
Colorado Springs
(177 posts)

Registered:
06/11/2009 02:12PM

Main British Car:
1980 MGB GM LA1 3400 V6

authors avatar
Re: Rover 14CUX Electronic Fuel Injection
Posted by: lars49
Date: July 03, 2013 09:28PM

Is the dashboard fed the PCM? I know the car from which my GM PCM came, the dash instruments are electronci and are fed by the PCM and BCU. That is not needed in my setup but I found that the PCM also has tach and speedo outputs which are proving to be useful.

Paranoia would indicate something far more sinister :-)



Edited 1 time(s). Last edit at 07/03/2013 09:28PM by lars49.


DiDueColpi
Fred Key
West coast - Canada
(1366 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
I really thought that I'd be an action figure by now!

authors avatar
Re: Rover 14CUX Electronic Fuel Injection
Posted by: DiDueColpi
Date: July 04, 2013 09:24PM

The road speed input lets the ECU know whether the vehicle is moving or not.
It can then calculate idle speed and decel fuel cuts etc.
The system will run OK without the input but will run better with it hooked up.
The frequency of the speed input doesn't matter. The ecu just looks for a pulse to determine vehicle movement.
Hope that helps
Cheers
Fred
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