2-80
POWER TRAIN
-
Automatic Transaxle
Engine Speed
The TCM uses both direct engine speed input from the crank-
shaft position sensor or distributor and calculated engine speed
‘Lj
input from the PCM over the CCD bus. The direct input is
required to provide immediate information for use by the TCM
control logic. The slower CCD engine speed data is used by
the TCM fail-safe logic to confirm that the direct engine speed
data is valid.
Speed Control Switch
The speed control on/off switch modifies the shift pattern when
a speed control “on” signal is received by allowing a torque
converter clutch engagement or disengagement, as well as
kickdown
shifts.
Manifold Absolute Pressure Sensor (MAP)
The MAP sensor provides engine load input and output torque
load on the input shaft to the TCM. These signals are sent
across the CCD bus to the TCM. The TCM uses this information
to modify shifting and reduce 3-4 shift hunting on grades.
d
To Next Page
Loading...
Need help?
General
