EEC-IV Questions

[Corey Cole]

On Wed, 10 Apr 1996, Brian Warburton, c/o Turbo Systems Ltd wrote:
> 
> Can't say for sure about the very latest Ford modules, but up until
> I left Ford of Britain in December 1994, the standard way to
> determine if you were running in LOS (limp-home mode) was to
> monitor the fuel pump with the ignition on before engaging crank. 
> The EEC-iv s/w used to keep the pump on for 1 second after key-on
> without detecting rotation before turning it off. In LOS, the pump
> was switched on all the time the ignition was on.
> 
So far, everything I've gotten from the experts out there (a hearty thank 
you to all of you) shows that the vehicle is in LOS mode.  The pump is on 
continuously with the key on, timing's fixed, etc.

> >From my experience, the only thing that made the module run LOS was
> the EEC-iv s/w failing to kick the LOS "watchdog". This implied a
> serious software bug causing the s/w to get "lost" (unlikely in a
> production module) or an electrical fault stopping the processor
> from executing the s/w. To the best of my knowledge, there were no
> sensor and/or actuator failures that would cause this condition.
> 
> It may be time to dust off the logic-analyser ............
> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Brian Warburton,   "Still searching for the perfect curve....."
> email: bwarb at turbo.win-uk.net
>                                Advanced Automotive Electronics Ltd,
>                                Van-Nuys House, Scotlands Drive,
>                                Farnham Common, England.  SL2-3ES
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>  
> 
> 
> 
> 


 Corey Cole					colec at pr.erau.edu
 '65 Skylark
"Knowledge is power...but cubic inches help."		Go #24!!!!!
 
I was drunk the day my mom got out of prison
and I went to pick her up in the rain.
But before I could get to the station in my pick up truck,
she got runned over by the darned old train...
						David Allen Coe
						Steve Goodman