[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>&gt;&gt;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% ?).&lt;&lt; </FONT></FONT></DIV>
  <DIV><FONT face=3Darial,helvetica><FONT =
size=3D2></FONT></FONT>&nbsp;</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&nbsp;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.&nbsp; =
</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&nbsp;plug, and =
the=20
  internal valving did the rest.</FONT>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D2>In 1993, they added separate signals =
to each gear=20
  pressure switch&nbsp;(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>&nbsp;</DIV>
  <DIV><FONT face=3Darial,helvetica><FONT size=3D2>&gt;&gt;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?&lt;&lt;</FONT></FONT></DIV>
  <DIV><FONT face=3Darial,helvetica><FONT =
size=3D2></FONT></FONT>&nbsp;</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>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D2>Lyndon.</FONT></DIV>
  <DIV><FONT face=3Darial,helvetica><FONT =
size=3D2></FONT></FONT>&nbsp;</DIV>
  <DIV><FONT face=3Darial,helvetica><FONT=20
size=3D2>&nbsp;<BR></FONT></FONT></DIV></BLOCKQUOTE></BODY></HTML>

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