[Gmecm] Vortec swap info needed

[William Lucke]

I believe that the PCM can check for opens and shorts on the shift solenoids.
It looks at VSS, of course. It looks at VSS and RPM together and compares 
that relationship to what it knows the gear ratios of the transmission are. 
It uses this information to make sure that the transmission is in the gear 
the PCM is commanding and isn't slipping. If it thinks the transmission is 
slipping, it can reduce engine power dramatically.
The 4L80E, 4L85E and 4T80E have input shaft speed sensors. The PCM can use 
these to determine convertor clutch status and more closely monitor 
transmission slippage. The 60 and 65 series transmissions do not have these 
sensors, however.


Will


>From: "Steve Ravet" <Steve.Ravet at arm.com>
>Subject: RE: [Gmecm] Vortec swap info needed
>
>The ECM is going to be unhappy about not having an electronic
>transmission connected.  It will expect signals from the trans.  There
>are plenty of smog sensors also -- in the evap cannister system, and
>feedback O2 sensors to keep an eye on the catalytic converters.
>Probably others, and who knows if what's left of the harness is correct.
>



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