2-74
POWER TRAIN
-
Automatic Transaxle
Electronic control system
Brake switch
Map sensor
I
Speed contr
Other vehicle
-ontrol modules
Scan tool
(MUT-II)
Transmission
control module
control
Output speed sensor
relay
-f
Input speed sensor
Four solenoids
Transaxle
---a----__
Transmission range
3
pressure switches
and
ParWNeutral
t
position switches
TCM Direct Inputs
The direct inputs connected to the TCM are battery
feed, ignition run signal, cranking signal, throttle
poskion
sensor signal, engine speed signal (distribu-
tor or
DE
crank sensor signal), input speed sensor
signal, output speed sensor signal, transmission
TCM Indirect Inputs over the CCD Bus
The indirect input signals the TCM senses from
the powertrain control module (PCM) that are sent
over the CCD data bus are, target idle speed, coolant
temperature, battery temperature, brake switch ON/
OFF signal, engine speed (verifies direct input en-
gine speed signal), speed control ON/OFF switch
signal, and the manifold absolute pressure sensor
signal.
As stated earlier, the TCM receives input informa-
tion, and it continuously processes this information
Direct Outputs from the TCM
The direct output signals or output devices the TCM
has control over are, the transmission control relay,
range switch signal, park neutral position switch
signal, low/reverse pressure switch signal, 2-4 pres-
sure switch signal, and the overdrive pressure switch
signal.
through its logic circuits in order to perform all of
the control functions that it has been designed to
perform. However, some of these control functions
are internal to the TCM, while other control functions
are performed when the TCM provides some type
of output signal to another control device. The follow-
ing is a list of outputs related to the transaxle control
system.
the four solenoids in the solenoid pack, and the
vehicle speed signal.
d
Indirect Outputs from the TCM over the CCD Bus
The only signal sent out from the TCM over the
CCD data bus is communication with the scan tool
(MUT-II) for diagnostics.
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