Tcc problem
Thread Starter
Teching In
Joined: Sep 2012
Posts: 5
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Tcc problem got a weird one here im sure someone has seen it before....i 98 z28 and have just done a 0411 pcm swap...all is good except for i have no tcc...took it out the last 2 days and when tcc is supposed to come on the check engine light flashes....i go to check code while the light is flashing and i have no codes....but..when i cleared the code while driving just for ***** and giggles it shifts into tcc? is it setting a code that is not reporting and i am clearing it? and i can also command tcc with vcm scanner ....after i clear codes it will shift into tcc a couple times after clearing code then stop again...check for codes and no codes but still will go into tcc if i clear codes...even though there arent any codes
Codes are the tip of the iceberg. There are TCC
(mis)behaviors that come from misfires (flashing SES,
is this) and there are some that come from immature
slip codes (P1870) which will inhibit any attempt to
lock until next key-cycle (until the code sets, which
I think takes 3 cycles in which the slip has been
excessive).
Depending on your converter, this could just be a
pressure problem (common w/ small diameter cheapo
converters with undersized clutch / piston) or it
could be details in the new PCM's tune (pressure
profile vs delivered torque, perhaps assumes a
larger or different converter than you really have).
Log TCC_Mode for intent, log TCC_Duty and force
motor current and TCC_Slip_PM, input and output
shaft speeds for action, and you can see what's
the deal.
(mis)behaviors that come from misfires (flashing SES,
is this) and there are some that come from immature
slip codes (P1870) which will inhibit any attempt to
lock until next key-cycle (until the code sets, which
I think takes 3 cycles in which the slip has been
excessive).
Depending on your converter, this could just be a
pressure problem (common w/ small diameter cheapo
converters with undersized clutch / piston) or it
could be details in the new PCM's tune (pressure
profile vs delivered torque, perhaps assumes a
larger or different converter than you really have).
Log TCC_Mode for intent, log TCC_Duty and force
motor current and TCC_Slip_PM, input and output
shaft speeds for action, and you can see what's
the deal.
