TCC Question

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Davenport - 26 May 2005 12:08 GMT

If the auto trans. torque converter clutch was not locking, would the "check
engine" light illuminate and an error code be set?

Thanks.

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noname - 26 May 2005 14:23 GMT

Only if it was an electrical problem like the wires loose or burnt or
shorted.
Mechanical problem with the TC clutch itself will not usually do it.

> If the auto trans. torque converter clutch was not locking, would the "check
> engine" light illuminate and an error code be set?
>
> Thanks.

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TranSurgeon - 26 May 2005 14:45 GMT

the CE light will come on any time the ECM sees an incorrect ratio for the
proper circumstances

so ANY TCC problem that prevented a 1:1 in 3rd with TC locked, or whatever
ratio the OD in the vehicle has with TC locked, will set it

GM has the infamous P-1870 which simply means 'transmission component
slipping', it can be anything from a bad brake switch to an internal problem
in any of 4 areas (forward pack, 3-4 pack, band, or TC {for the 4L60E})

> Only if it was an electrical problem like the wires loose or burnt or
> shorted.
[quoted text clipped - 5 lines]
> >
> > Thanks.

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TBone - 26 May 2005 16:11 GMT

Why would a brake switch flag a slipping trans code?

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> the CE light will come on any time the ECM sees an incorrect ratio for the
> proper circumstances
[quoted text clipped - 15 lines]
> > >
> > > Thanks.

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TranSurgeon - 26 May 2005 18:54 GMT

because power for the TCC on-off solenoid (pre-01) goes thru the NC contacts
on the switch (GM trucks)

if the witch is bad (open at rest) the TCC cannot come on

it usually flags an additional code of the P-188X variety which signals an
electrical problem in the TC solenoid circuit....BUT it will ALWAYS flag an
1870 because the ECM is looking for 1:1 in 3rd with TC commanded on

> Why would a brake switch flag a slipping trans code?
>
[quoted text clipped - 18 lines]
> > > >
> > > > Thanks.

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TBone - 26 May 2005 19:07 GMT

Ok, now it make sense, thanks Gary

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> because power for the TCC on-off solenoid (pre-01) goes thru the NC contacts
> on the switch (GM trucks)
[quoted text clipped - 30 lines]
> > > > >
> > > > > Thanks.

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