Transmission Control Relay; Transmission Range Sensor - Dodge Intrepid Service Manual

21 - 152 TRANSAXLE
TRANSMISSION CONTROL
RELAY
DESCRIPTION
The transmission control relay is located in the
Power Distribution Center (PDC) on the left side of
the engine compartment (Fig. 401) .
Fig. 401 Transmission Control Relay Locat

1 - TRANSMISSION CONTROL RELAY

2 - PDC
3 - TCM
OPERATION
The relay is supplied fused B+ voltage, energized
by the PCM, and is used to supply power to the sole-
noid pack when the transmission is in normal oper-
ating mode. When the relay is "off", no power is
supplied to the solenoid pack and the transmission is
in "limp-in" mode. After a controller reset (ignition
key turned to the "run" position or after cranking
engine), the PCM energizes the relay. Prior to this,
the PCM verifies that the contacts are open by check-
ing for no voltage at the switched battery terminals.
After this is verified, the voltage at the solenoid pack
pressure switches is checked. After the relay is ener-
gized, the PCM monitors the terminals to verify that
the voltage is greater than 3 volts.
TRANSMISSION RANGE
SENSOR
DESCRIPTION
The Transmission Range Sensor (TRS) is mounted
to the top of the valve body inside the transaxle and
can only be serviced by removing the valve body
assembly. The electrical connector extends through
the transaxle case (Fig. 402).
Fig. 402 Valve Body Assembly
1 - SOLENOID/PRESSURE SWITCH ASSEMBLY
2 - TRS
3 - TRANSFER PLATE
4 - SEPARATOR PLATE
5 - VALVE BODY
The Transmission Range Sensor (TRS) has four
switch contacts that monitor shift lever position and
send the information to the PCM.
The TRS also has an integrated temperature sen-
sor (thermistor) that communicates transaxle tem-
perature to the PCM (Fig. 403).
OPERATION
The Transmission Range Sensor (TRS) (Fig. 402)
communicates shift lever position (SLP) to the PCM
as a combination of open and closed switches. Each
shift lever position has an assigned combination of
switch states (open/closed) that the PCM receives
from four sense circuits. The PCM interprets this
information and determines the appropriate trans-
axle gear position and shift schedule.
LH