Check for any
engine-related misfire
codes: P0300, P0301,
P0302, P0303 or P0304.
If there are no codes
stored, monitor the TCC
command status along
with the engine mis-
fire counters. While the
PCM identifies a misfire
it commands the TCC off
(cycled); once the mis-
fire count reaches 100 it
turns the TCC off com-
pletely (figure 8). There
still may be no misfire
codes stored.
GM has a repro-
gramming update to
address this condition.
The updated program
changes the misfire diag-
nostic monitors.
Note: On early
model GM vehicles, a
bad oxygen senor will Figure 7
prevent the PCM from
going into closed loop or cycle the
PCM in and out of closed loop. This
problem will also cycle or prevent the
TCC from applying.
Just think: None of these condi-
tions is part of a normal, everyday
transmission job… or are they?
Figure 8
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mation Super Stor
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