Indicated Gear Position
Transmission
Status
Column Shifter
Position
Mechanical State
Electronic Display
(Ignition Unlocked)
Electronic Display
(Ignition On)
P
P
P
Vehicle is in PARK
with the pawl
engaged.
In the PARK gate.
R
The PARK pawl is
disengaged and the
vehicle is free to
roll, but REVERSE
is not engaged.
Between the PARK
and REVERSE
gates.
R
R
R
The transmission is
hydraulically in
REVERSE.
In the REVERSE
gate.
N
The transmission is
transitioning
between REVERSE
and NEUTRAL.
Between the
REVERSE and
NEUTRAL gates.
N
N
N
The vehicle is in
NEUTRAL.
In the NEUTRAL
gate.
N
The transmission is
transitioning
between NEUTRAL
and DRIVE, but is
not in DRIVE.
Between the
NEUTRAL and
DRIVE gates.
D
D
D
The transmission is
hydraulically in
DRIVE.
In the DRIVE gate,
2
2
2
The transmission is
hydraulically in
Manual SECOND.
In the SECOND
gate.
1
1
1
The transmission is
hydraulically in
Manual FIRST.
In the FIRST gate.
DIAGNOSIS AND TESTING - TRANSMISSION
RANGE SENSOR (TRS)
NOTE: For all circuit identification in the following
steps, Refer to the appropriate Wiring Information.
(1) Raise vehicle on suitable hoist.
(2) Disconnect the vehicle’s shift cable from the
manual lever.
(3) With the manual lever in the PARK position
(the PARK position is with the manual lever moved
to the full rearward position), measure the resistance
between the Park/Neutral Position Sense pin of the
TRS and the transmission case. The resistance
should be less than 5 ohms.
(4) With the manual lever in the NEUTRAL posi-
tion (the NEUTRAL position is with the manual
lever moved two detents forward of the full rearward
position), measure the resistance between the Park/
Neutral Position Sense pin of the TRS and the trans-
mission case. The resistance should be less than 5
ohms.
(5) If the resistance is greater than 5 ohms in
either of the previous steps, check for a dirty contact
between the tip of the TRS rod and the valve body
manual lever. If the contact is OK, replace the TRS.
(6) With the manual lever in the REVERSE posi-
tion (the REVERSE position is with the manual lever
moved one detent forward of the full rearward posi-
tion), measure the resistance between the Fused
Ignition Switch Output and the Back-up Lamp feed
pins of the TRS. The resistance should be less than 5
ohms. If the resistance is greater than 5 ohms,
replace the TRS.
21 - 264
AUTOMATIC TRANSMISSION - 48RE
DR
TRANSMISSION RANGE SENSOR (Continued)