42Le Automatic Transaxle - Chrysler 2004 Concorde Service Manual

21 - 2 TRANSAXLE
SHIFT INTERLOCK SOLENOID
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 135
SHIFT INTERLOCK SYSTEM
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . 136
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 137
DIAGNOSIS AND TESTING - BRAKE/
TRANSMISSION SHIFT INTERLOCK
SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
SHIFT MECHANISM
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 140
SOLENOID/PRESSURE SWITCH ASSY
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . 141
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 141
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 142
SPEED SENSOR - INPUT
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . 143
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 143
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 144
SPEED SENSOR - OUTPUT
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . 144
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 145
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
42LE AUTOMATIC
TRANSAXLE
DESCRIPTION
The 42LE (Fig. 1) is a four-speed transaxle that is
a conventional hydraulic/mechanical assembly with
an integral differential, and is controlled with adap-
tive electronic controls and monitors. The hydraulic
system of the transaxle consists of the transaxle
fluid, fluid passages, hydraulic valves, and various
line pressure control components. An input clutch
assembly which houses the underdrive, overdrive,
and reverse clutches is used. It also utilizes separate
holding clutches: 2nd/4th gear and Low/Reverse. The
primary mechanical components of the transaxle con-
sist of the following:
• Three multiple disc input clutches
• Two multiple disc holding clutches
• Four hydraulic accumulators
• Two planetary gear sets
• Hydraulic oil pump
• Valve body
• Solenoid/Pressure switch assembly
• Integral differential assembly
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 145
TORQUE CONVERTER
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . 146
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 146
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 146
TRANSFER SYSTEM
INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . 147
ADJUSTMENTS
DRIVE SPROCKET HEIGHT ADJUSTMENT
PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . 148
TRANSMISSION CONTROL RELAY
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . 149
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 149
TRANSMISSION RANGE SENSOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . 150
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 150
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 151
VALVE BODY
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . 151
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 152
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . 155
ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 166
Control of the transaxle is accomplished by fully
adaptive electronics. Optimum shift scheduling is
accomplished through continuous real-time sensor
feedback information provided to the Powertrain
Control Module (PCM).
The PCM is the heart of the electronic control sys-
tem and relies on information from various direct
and indirect inputs (sensors, switches, etc.) to deter-
mine driver demand and vehicle operating condi-
tions. With this information, the PCM can calculate
and perform timely and quality shifts through vari-
ous output or control devices (solenoid pack, trans-
mission control relay, etc.).
The PCM also performs certain self-diagnostic
functions and provides comprehensive information
(sensor data, DTC's, etc.) which is helpful in proper
diagnosis and repair. This information can be viewed
with the DRB scan tool.
LH