mission is in normal operating mode. When the relay
is “off”, no power is supplied to the solenoid pack and
the transmission is in “limp-in” mode. After a control-
ler 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 checking for no voltage at the switched bat-
tery terminals. After this is verified, the voltage at
the solenoid pack pressure switches is checked. After
the relay is energized, the PCM monitors the termi-
nals 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. The
electrical connector extends through the transaxle
case (Fig. 380).
The Transmission Range Sensor (TRS) has four
switch contacts that monitor shift lever position and
send the information to the PCM/TCM.
The TRS also has an integrated temperature sen-
sor (thermistor) that communicates transaxle tem-
perature to the TCM and PCM (Fig. 381).
OPERATION
The Transmission Range Sensor (TRS) (Fig. 380)
communicates shift lever position (SLP) to the PCM/
TCM as a combination of open and closed switches.
Each shift lever position has an assigned combina-
tion of switch states (open/closed) that the PCM/TCM
receives from four sense circuits. The PCM/TCM
interprets
this
information
and
determines
the
appropriate transaxle gear position and shift sched-
ule.
Since there are four switches, there are 16 possible
combinations of open and closed switches (codes).
Seven of these codes are related to gear position and
three are recognized as “between gear” codes. This
results in six codes which should never occur. These
are called “invalid” codes. An invalid code will result
Fig. 379 Transmission Control Relay Location
1 - TRANSMISSION CONTROL RELAY
2 - POWER DISTRIBUTION CENTER
Fig. 380 Transmission Range Sensor (TRS)
Location
1 - TRANSMISSION RANGE SENSOR
Fig. 381 Transmission Temperature Sensor
1 - TRANSMISSION RANGE SENSOR
2 - TEMPERATURE SENSOR
CS
41AE/TE AUTOMATIC TRANSAXLE
21 - 159
TRANSMISSION CONTROL RELAY (Continued)