Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1979
CONTACT-TEMPERATURE SENSOR/PARK-NEUTRAL
DESCRIPTION
PARK/NEUTRAL CONTACT
The park/neutral contact (4) is located in the shell of
the electric control unit and is fixed to the conductor
tracks.
Its purpose is to recognize selector valve and selector
lever positions
9
P
9
and
9
N
9
. The park/neutral contact
consists of:
•
the plunger (2).
•
the permanent magnet (3).
•
the dry-reed contact (4).
TRANSMISSION TEMPERATURE SENSOR
The transmission oil temperature sensor (1) is located
in the shell of the electric valve control unit and is
fixed to the conductor tracks.
Its purpose is to measure the temperature of the
transmission oil and pass the temperature to the TCM
as an input signal. It is a temperature-dependent
resistor (PTC).
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AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATION
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OPERATION
PARK/NEUTRAL CONTACT
In selector lever positions
9
P
9
and
9
N
9
the park/neutral
contact (4) is actuated by a cam track which is located
on the detent plate. The permanent magnet (3) is
moved away from the dry-reed contact (4). The dry-
reed contact (4) is opened. The TCM receives an
electric signal. The circuit to the starter in the selector
lever positions
9
P
9
and
9
N
9
is closed.
TRANSMISSION TEMPERATURE SENSOR
The temperature of the transmission oil has a consid-
erable effect on the shifting time and therefore the
shift quality. By measuring the oil temperature, shift
operations can be optimized in all temperature ranges.
The
transmission
oil
temperature
sensor
(1)
is
switched in series with the park/neutral contact. The
temperature signal is transferred to the TCM only
when the dry-reed contact of the park/neutral contact
is closed in REVERSE or a forward gear position.
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AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATION
21 - 451
Refer to the Transmission Temperature Sensor Speci-
fications table for the relationship between transmis-
sion
temperature,
sensor
voltage,
and
sensor
resistance.
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AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATION
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CONVERTER-TORQUE
DESCRIPTION
CAUTION: The torque converter must be replaced
if a transmission failure resulted in large amounts
of metal or fiber contamination in the fluid.
The torque converter is a hydraulic device that cou-
ples the engine crankshaft to the transmission. The
torque converter consists of an outer shell with an
internal turbine (1), a stator (3), an overrunning clutch,
an impeller (2), and an electronically applied converter
clutch. The converter clutch provides reduced engine
speed and greater fuel economy when engaged.
Clutch engagement also provides reduced transmis-
sion fluid temperatures. The converter clutch engages
in third through fifth gears. The torque converter hub
drives the transmission oil (fluid) pump.
A turbine damper (6) has been added for some appli-
cations to help improve vehicle noise, vibration, and
harshness (NVH) characteristics.
The torque converter is a sealed, welded unit that is
not repairable and is serviced as an assembly.
1 - TURBINE
2 - IMPELLER
3 - STATOR
4 - INPUT SHAFT
5 - STATOR SHAFT
6 - TURBINE DAMPER
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AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATION
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