Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 401
6. Remove the rubber bumper from PCM.
INSTALLATION
USE THE SCAN TOOL TO REPROGRAM THE NEW POWERTRAIN CONTROL MODULE (PCM) WITH THE
VEHICLES ORIGINAL IDENTIFICATION NUMBER (VIN) AND THE VEHICLES ORIGINAL MILEAGE. IF THIS
STEP IS NOT DONE, A DIAGNOSTIC TROUBLE CODE (DTC) MAY BE SET.
1. Install rubber bumper to PCM back.
2. Check pins in electrical connectors for damage.
Repair as necessary.
3. Install electrical connectors to PCM.
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4. Install mounting bracket to PCM.
5. Install assembly to body. Install bolt and tighten 9
N·m (80 in. lbs.) torque.
6. Connect negative cable to battery.
7. Use the scan tool to reprogram new PCM with vehicles original Identification Number (VIN) and original vehicle
mileage.
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MODULE-TRANSMISSION CONTROL
DESCRIPTION
TRANSMISSION CONTROL MODULE - 42RLE
The Transmission Control Module (TCM) is a sub-
module within the Powertrain Control Module (PCM).
The Powertrain Control Module (PCM) is located in
the right rear of the engine compartment, just in front
of the windshield.
TRANSMISSION CONTROL MODULE - NAG1
The electronic control system consists of various com-
ponents providing inputs to the transmission control
module (TCM). The TCM monitors transmission sen-
sors, shift lever position, and bus messages to deter-
mine transmission shift strategy. After shift strategies
are determined, the TCM controls the actuation of
transmission solenoids, which controls the routing of
hydraulic fluid within the transmission, by moving a
sequence of four valves to make a shift occur.
The NAG1 electronic transmission has a fully adaptive
control system. The system performs its functions
based on continuous real-time sensor feedback infor-
mation. In addition the TCM receives information from
the PCM (engine management) and ABS (chassis sys-
tems) controllers over the CAN bus. The CAN bus is a
high-speed communication bus that allows real time
control capability between various controllers. Most
messages are sent every 20 milliseconds. This means
critical information can be shared between the trans-
mission, engine, and ABS controllers. The CAN bus is
a two wire bus with a CAN Bus (+) circuit and a CAN
Bus (-) circuit. These circuits are twisted pairs in the
harness to reduce the potential of radio and noise interference.
The transmission control system automatically adapts to changes in engine performance, vehicle speed, and trans-
mission temperature variations to provide consistent shift quality. The control system ensures that clutch operation
during up-shifting and downshifting is more responsive without increased harshness. The TCM activates the sole-
noid valves and moves valves in the valve body to achieve the necessary gear changes. The required pressure
level is calculated from the load condition, engine speed. Vehicle speed (from ABS module) and transmission oil
temperature, matched to the torque to be transmitted. The TCM is located under the left side of the instrument panel
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for left hand drive vehicles. For right hand drive vehicles, the TCM is located in the mirrored location under the right
side of the instrument panel.
OPERATION
TRANSMISSION CONTROL MODULE - 42RLE
The Transmission Control Module (TCM) controls all electronic operations of the transmission. The TCM receives
information regarding vehicle operation from both direct and indirect inputs, and selects the operational mode of the
transmission. Direct inputs are hard wired to, and used specifically by the TCM. Indirect inputs are shared with the
TCM via the vehicle communication bus.
Some examples of direct inputs to the TCM are:
•
Battery (B+) voltage
•
Ignition “ON” voltage
•
Transmission Control Relay (Switched B+)
•
Throttle Position Sensor
•
Crankshaft Position Sensor
•
Transmission Range Sensor
•
Pressure Switches
•
Transmission Temperature Sensor
•
Input Shaft Speed Sensor
•
Output Shaft Speed Sensor
•
Line Pressure Sensor
Some examples of indirect inputs to the TCM are:
•
Engine/Body Identification
•
Manifold Pressure
•
Target Idle
•
Torque Reduction Confirmation
•
Engine Coolant Temperature
•
Ambient/Battery Temperature
•
Scan Tool Communication
Based on the information received from these various inputs, the TCM determines the appropriate shift schedule
and shift points, depending on the present operating conditions and driver demand. This is possible through the
control of various direct and indirect outputs.
Some examples of TCM direct outputs are:
•
Transmission Control Relay
•
Solenoids
•
Torque Reduction Request
Some examples of TCM indirect outputs are:
•
Transmission Temperature (to PCM)
•
PRNDL Position (to cluster/CCN)
In addition to monitoring inputs and controlling outputs, the TCM has other important responsibilities and functions:
•
Storing and maintaining Clutch Volume Indexes (CVI)
•
Storing and selecting appropriate Shift Schedules
•
System self-diagnostics
•
Diagnostic capabilities (with scan tool)
NOTE: If the TCM has been replaced, the “Quick Learn Procedure” must be performed. (Refer to 8 - ELEC-
TRICAL/ELECTRONIC CONTROL MODULES/TRANSMISSION CONTROL MODULE - STANDARD PROCE-
DURE)
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