re follow the missing DTCs, Re: Re: Bloomberg news: Regulators Hired by Toyota Helped Halt Acceleration Probes

[Dave Farber <dave () farber net>]

Begin forwarded message:

> From: "Ed Gerck, Ph.D." <egerck () nma com>
> Date: February 14, 2010 5:37:25 PM EST
> To: dave () farber net
> Cc: ip <ip () v2 listbox com>
> Subject: Re: follow the missing DTCs, Re: [IP] Re:  Bloomberg news:  
> Regulators Hired by Toyota Helped Halt Acceleration Probes

> [Dave, for IP if you wish]
> > *From: *Jim Thompson <jim () netgate com <mailto:jim () netgate com>>
> > *Date: *February 14, 2010 2:50:17 PM EST
> > *To: *"dave () farber net <mailto:dave () farber net>" <dave () farber net <mailto:dave () farber net 
> > >>
> > *Cc: *ip <ip () v2 listbox com <mailto:ip () v2 listbox com>>
> > *Subject: **Re: follow the missing DTCs, Re: [IP] Re: Bloomberg  
> > news: Regulators Hired by Toyota Helped Halt Acceleration Probes*
> >
> > ---
> > For example, Toyota DTC P1520 (for Stop Lamp Switch Signal  
> > Malfunction) detects a malfunction that seems to be far harder to  
> > detect than "continued acceleration while breaking".
> > ---
> > Accleration while braking is trivial to detect. ...[examples]
>
> Yes, the needed signals should already be present internally in the  
> car processor's and all that should be needed is a software update.  
> There should be no hardware to add or change.
>
> This added DTC and others that can be related to this case (such as  
> "neutral shift engaged while accelerating") should be a mandatory  
> update to all vehicles (not just Toyota), as a way to not only find  
> out what's happening but also to provide accountability to hold the  
> manufacturer (Toyota) to the driver's seat of these incidents.
>
> The secondary question, but not less important, is why Toyota did  
> not implement these diagnostics before? Not to create potentially  
> damning evidence? What other DTCs, for other failure modes (for  
> example, "engine fails to switch off when user presses and holds the  
> OFF button" -- which fault is not an uncommon occurrence in at least  
> one Prius that I know) are also missing? A rather simple logical  
> analysis of the potential faults and their security risks should  
> easily lead to a number of needed DTCs, which must be included, in  
> addition to the ones that are progressively revealed by customer  
> feedback.
>
> Finally, there should be a peer-reviewed, independent mechanism to  
> incorporate and verify customer feedback of faults into the  
> available DTCs. Automated testing in a lab is not enough, as  
> environmental, driving, and other conditions may play a role.
>
> Best regards,
> Ed Gerck
> www.gerck.com



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