vss problems on 730..again
Shannen Durphey
shannen at grolen.com
Tue May 15 22:33:09 GMT 2001
Hi, Mike.
Found this letter just tonight. I thopught it might be of relevance.
Shannen
> Subject:
> 7730 Vss signal processing
> Date:
> Mon, 07 May 2001 22:18:45 -0500
> From:
> "K.E.T." <karljiml at compuserve.com>
> Reply-To:
> gmecm at diy-efi.org
> To:
> gmecm at diy-efi.org
>
>
>
>
> I think I've learned that the 7730 ECM, depending on the car in which it is
> installed, handles the Vss signal two ways:
>
> A) Raw Vss signal from transmission sensor input on pins B9 & B10, and
> outputs signals for 4000p/mi on pin B11and a 2000 p/mi on pin C1
> OR
> B) Accepts a 4000 p/mi signal from an external signal buffer (yellow box)
> on pin C6
>
> From experience, if the MEMCAL is expecting option B, but the car is wired
> for option A, a digital speedometer reads much higher than actual speed.
>
<snipped>
> Karl
Mike Rolica wrote:
>
> Sorry i have been away for a while..
> rx7 or rx8 is now safteyed and on the road..
> got a problem with the vss..
> the mazda vss. is twice the speed of what the ecm wants.
> ie ecm thinks 50mph is 100mph. This causes some problems with tcc ect.
> I am running aujp code in a 730, but while it was in my truck i had it setup for the optical sensor...
> anyone got any ideas on how to make this accurate ?
>
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