[Diy_efi] TCC control
Programmer
nwester at eidnet.org
Thu Jul 4 23:49:23 GMT 2002
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>>what kind of mods have to be done in the '85 valve body to control =
it with the ECM? I know the 4-3 downshift switch must be removed because =
that is a function of the ECM (through delta TPS% ?).<<=20
There's about 8 different wiring schematics for the 1987 through 1993 =
ECM (TCC controlled) 700R4. Either way, the ECM always supplies the =
ground based on what the PROM code
says--TPS vs VSS or load. The internal switches on the valve body just =
complete the circuit to the TCC so there's no lockup in 2nd or 1st (and =
some in 3rd).=20
A type 10 circuit uses a 4-3 switch which is normally closed. The TCC =
solenoid is in series with it and the 4th pressure switch, which is =
normally open. =20
A type 22 circuit has a separate 4th gear signal to the ECM and a =
separate ground path through the TCC solenoid to the ECM. All of these =
are supplied with a 12V signal
to one side of the TCC solenoid circuit. The older style circuits just =
supplied 12V to the 4 prong plug, and the internal valving did the rest. =
In 1993, they added separate signals to each gear pressure switch =
(except 1st). Again, there's so many variations on this,
you really just need the one input to lock the TCC solenoid for your =
application--you could pretty much go right back to a 1982 700R4 type 1 =
valve body.
>>What about the plugs they (GM) installed in place of the TV sleve =
and the TCC shift valve. Will I need to install the aluminium plugs?<<
Don't touch the throttle valve sleeve. The TCC shift valve is also =
just fine as is. I've done a few of these older/newer swaps and haven't =
run into any problems, and they work just great.
If you want this thing to shift great, stick a Transgo 700-1 shift kit =
into it...
Lyndon.
=20
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<DIV><FONT face=3Darial,helvetica><FONT size=3D2>>>what kind of =
mods have to=20
be done in the '85 valve body to control it with the ECM? I know the =
4-3=20
downshift switch must be removed because that is a function of the ECM =
(through delta TPS% ?).<< </FONT></FONT></DIV>
<DIV><FONT face=3Darial,helvetica><FONT =
size=3D2></FONT></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>There's about 8 different wiring =
schematics for=20
the 1987 through 1993 ECM (TCC controlled) 700R4. Either way, the ECM=20
always supplies the ground based on what the PROM =
code</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>says--TPS vs VSS or load. The =
internal switches=20
on the valve body just complete the circuit to the TCC so there's no =
lockup in=20
2nd or 1st (and some in 3rd). </FONT></DIV>
<DIV><FONT face=3DArial size=3D2>A type 10 circuit uses a 4-3 switch =
</FONT><FONT=20
face=3DArial size=3D2>which is normally closed. The TCC solenoid is in =
series with=20
it and the 4th pressure switch, which is normally open. =
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>A type 22 circuit has a separate 4th =
gear signal=20
to the ECM and </FONT><FONT face=3DArial size=3D2>a separate ground =
path through=20
the TCC solenoid to the ECM. All of these are supplied with a 12V=20
signal</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>to one side of the TCC solenoid =
circuit. The=20
older style circuits just supplied 12V to the 4 prong plug, and =
the=20
internal valving did the rest.</FONT> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>In 1993, they added separate signals =
to each gear=20
pressure switch (except 1st). Again, there's so many variations =
on=20
this,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>you really just need the one input to =
lock the=20
TCC solenoid for your application--you could pretty much go right back =
to a=20
1982 700R4 type 1 valve body.</FONT></DIV>
<DIV><FONT face=3Darial,helvetica><FONT =
size=3D2></FONT></FONT> </DIV>
<DIV><FONT face=3Darial,helvetica><FONT size=3D2>>>What about =
the plugs they=20
(GM) installed in place of the TV sleve and the TCC shift valve. Will =
I need=20
to install the aluminium plugs?<<</FONT></FONT></DIV>
<DIV><FONT face=3Darial,helvetica><FONT =
size=3D2></FONT></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Don't touch the throttle valve =
sleeve. The TCC=20
shift valve is also just fine as is. I've done a few of these =
older/newer=20
swaps and haven't run into any problems, and they work just=20
great.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>If you want this thing to shift =
great, stick a=20
Transgo 700-1 shift kit into it...</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Lyndon.</FONT></DIV>
<DIV><FONT face=3Darial,helvetica><FONT =
size=3D2></FONT></FONT> </DIV>
<DIV><FONT face=3Darial,helvetica><FONT=20
size=3D2> <BR></FONT></FONT></DIV></BLOCKQUOTE></BODY></HTML>
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