Just when you thought you had all of the P1870 Torque Converter
Clutch slip codes under your belt, another vehicle comes along.... and
here we go again!
I am sure that most of you are familiar with the 4L60E P1870 TCC slip
code and Torque Converter shudder problems related to the code. This was
usually related to Torque Converter Regulator Valve bore wear out, causing
a loss of Torque Converter Apply pressure, allowing the Torque Converter
Clutch to slip, and we all know what fixes are available for that. Now
we have a 2000 model year Isuzu Trooper and BMW models, equipped with
the 4L30-E transmission, showing up into shops with the same P1870 code.
You guessed it, the same kind of TCC Regulator Valve bore wear is the
cause here also. The biggest problem, is that there is little printed
material to tell us where the TCC regulator Valve train is located and
how it works. We all know that if you don't know how it works, you cant
even begin to to fix it!
History: In the 2000 model year, Isuzu Trooper and some BMW models went
to a Pulse Width Modulated Torque Converter Clutch apply strategy. Isuzu
Rodeo, Honda Passport and Cadillac Catera stayed with the typical ON-OFF
TCC apply, that they have had since day one. This strategy change, on
these limited models, has created some serious confusion in parts interchange
and the identification of parts.
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