shift indictor not working!!!!

[GreggNoble]

hi, guys my brother has an o3 cummins ram and the indicator below the dash clocks that tells you if your in D=DRIVE-N=NEUTRAL-R=REVERSE ETC... is not working, the trans is working fine and its not a problem for him but his wife has been reving the hell out off the cummins cause its in 2nd gear and she cant tell ha ha ha ha anyone know whats wrong here? thanks

 

[JJPage]

Does he have a progammer? With a Smarty, if you turn the "shift de-fuel" on, you lose that feature. Not sure with Bullydog's tq management.

 

[GreggNoble]

thanks but his truck is totally stock. didn`t know if it was a common thing with 3rd gens

 

[JLandry]

Gregg,

Your bother's transmission may have a loose or faulty TRS (Transmission Range Sensor). This is an electronic device located on the driver's side of the transmission which tells the instrument cluster which gear the transmission is in.

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 position
(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 transmission
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 position
(the REVERSE position is with the manual lever
moved one detent forward of the full rearward position),
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.
(7) 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 Transmission Range Sensor MUX and
the Transmission Range Sensor 5V Supply pins of
the TRS. The resistance should be 522. 2 ohms. If the
resistance is not correct, replace the TRS.
(8) With the manual lever in the REVERSE position
(the REVERSE position is with the manual lever
moved one detent forward of the full rearward position),
measure the resistance between the Transmission
Range Sensor MUX and the Transmission Range
Sensor 5V Supply pins of the TRS. The resistance
should be 206. 2 ohms. If the resistance is not correct,
replace the TRS.
(9) With the manual lever in the NEUTRAL position
(the NEUTRAL position is with the manual
lever moved two detents forward of the full rearward
position), measure the resistance between the Transmission
Range Sensor MUX and the Transmission
Range Sensor 5V Supply pins of the TRS. The resistance
should be 108. 6 ohms. If the resistance is not
correct, replace the TRS.
(10) With the manual lever in the DRIVE position
(the DRIVE position is with the manual lever moved
three detents forward of the full rearward position),
measure the resistance between the Transmission
Range Sensor MUX and the Transmission Range
Sensor 5V Supply pins of the TRS. The resistance
should be 59. 9 ohms. If the resistance is not correct,
replace the TRS.
(11) With the manual lever in the SECOND position
(the SECOND position is with the manual lever
moved one detent rearward of the full forward position),
measure the resistance between the Transmission
Range Sensor MUX and the Back-up Lamp feed
pins of the TRS. The resistance should be 31. 9 ohms.
If the resistance is not correct, replace the TRS.
(12) With the manual lever in the LOW position
(the LOW position is with the manual lever moved to
the full forward position), measure the resistance
between the Transmission Range Sensor MUX and
the Back-up Lamp feed pins of the TRS. The resistance
should be 13. 7 ohms. If the resistance is not
correct, replace the TRS.​

REMOVAL

(1) Raise vehicle and position drain pan under the
transmission range sensor (TRS).
(2) Move the transmission manual lever to the
manual LOW position. The manual LOW position is
with the manual lever in the forward-most detent.
(3) Disengage the wiring connector from the TRS.
(4) Remove the two screws holding the TRS to the
TRS mounting bracket.
(5) Remove the TRS (Fig. 244) from the TRS
mounting bracket by pulling it straight out of the
bracket.​

 

[Bob Wagner]

Landry you are a great asset to the TDR . Thank you

 

[sag2]

Is the indicator blank, box around one shift position, or all positions boxed out? Each one will mean different problem.

 

[GreggNoble]

Landry . thanks so much, i printed the page off and gave it to my brother,hope he gets it fixed SAG2. the little indicator will move one position right from the P=Park position and thats where it will stay. i think it`ll go back to park sometimes too. thanks

 

[sag2]

Sounds like the range switch or wiring. Follow the diagnostic above. I thought it might be a BUS problem but not with those symptoms.

 

[Bob4x4]

Ck the pcm connectors for water intrusion/corrosion