- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Your transfer case is electronically controlled by the transfer case control module (TCCM). It will only engage and change selections based on specific operating parameters. If you are not able to select any 4WD range, you'll probably have to use a compatible scanner to determine why the TCCM is not allowing selection (or to determine if it is working properly).
If it is electronic activated 4 WD, this system has a transfer case control module located in the dash behind the climate controls.It can go bad and cause the system not to engage the 4WD. May want to check power and ground to the module first.
It's located behind the Passenger side kick panel. Easy to access since the kick panel only has one plastic clip holding it in place and the 4x4CM has two 7mm hex head screws holding it in place.
The transmission control module and the transfer case control module are separate parts. The transmission control module is mounted under the hood and controls only transmission functions. The transfer case control module controls only the transfer case, and is located inside the truck. If you remove the trim panel under the steering column you will find the transfer case control module mounted just to the right of the opening.
The shift motor is located just behind the axle tube to prevent damage.There is a shift motor on the right front axle that is vacuum operated. The shift motor (1) is an electromechanical device consisting of a DC permanent magnet motor, a motor brake, a gear train and an analog position sensor. The shift motors' overall function is to move and lock a gear that moves the mode fork found in the transfer case. This allows the transfer case to be shifted electrically to multiple operating positions (4LOCK and AWD). The operating current of the shift motor under stall conditions is 30 amps maximum at 72° F with 13.5 volts, at the motor leads.OPERATION Shifting in the transfer case occurs when the shift motor brake is released and a Pulse Width Modulated (PWM) voltage is supplied to the shift motor by the Front Control Module (FCM). A linear analog position sensor located inside the shift motor, provides the FCM with the motors' angular, rotational position. With this information, the FCM continuously knows the motors' position, and therefore allows it to accurately control the motors' operation, including voltage polarity which is used to control motor direction.
REMOVAL :---Note: New shift motor assemblies are shipped in the AWD position. If a new shift motor assembly must be installed, it will be necessary to shift the transfer case to the AWD position prior to motor installation.Raise the vehicle on a suitable hoist.Remove the front propeller shaft. Disengage the wiring connectors from the shift motor and mode sensor.Remove the front output shaft companion flange from the transfer case.Remove the bolts (Remove the Shift Motor and Mode Sensor Assembly Bolts) holding the shift motor and mode sensor assembly onto the transfer case.Separate the shift motor and mode sensor assembly from the transfer case. See fig below:-- 1 - TRANSFER CASE.2 - SHIFT MOTOR AND MODE SENSOR ASSEMBLY.3 - BOLT.--This should help.Thanks.Helpmech.
The transfer case is controlled electronically by a transfer case control module (TCCM) which sends commands to a shift motor on the transfer case, and monitors the transfer case gear selection using a transfer case mode sensor. The problem can lie with any of these three items, or mechanically with the transfer case itself.
As you say there are no lights at all now on the selector panel, you may want to check fuse #11 (10 amp) in the junction box under the cover at the left end of the dashboard assembly, and fuse A (20 amp) in the power distribution center under the hood.
×