How does a two wheel drive transfer case work?

The transfer case motor rotates the actuator shaft which moves the transfer case two/four wheel drive actuator cam and transfer case high/low shift fork to shift the transfer case between the following modes or ranges: 2 HI, 4WD HI, 4WD LOW, Neutral

When to replace transfer case shift control switch?

You also have to diagnose the connector of the transfer case shift control switch and the ground circuit for ground. If the TCCM fails the self-test but all these circuits turn out fine, you have to replace the TCCM. It is normal to have this message sometimes. It goes away when you shut the vehicle off and then turn it back on.

How to change 4 wheel drive from 2WD to 2WD?

Turn the transfer case shift control switch (TCSCS) to the 2WD HI position for at least 5 seconds. 6. Turn the TCSCS clockwise past the 4WD LO position to the neutral request position and hold for at least 30 seconds. 7. An audible noise from the transfer case encoder motor should occur indicating asuccessful learn procedure.

How does the transfer case control module work?

As you already know, the TCCM controls the shifting in the 4WD system. But, how does it do that? The module determines the processing of the shift by using the speed of the vehicle and the real-time transfer case mode. if the shift is possible, the TCCM will complete it by activating the transfer case encoder motor.

How does transfer case switch to 4 wheel drive?

In order for the transfer case to switch into four wheel drive, 4×4 mode a gear must be turned inside the transfer case. The 4WD Transfer Case Shift Encoder motor is the part that turns the gear inside the transfer case, allowing your vehicle to be switched into 4×4 mode.

Is the 4WD transfer case shift encoder motor OEM?

OEM Fit, Quality, Finish – The 4WD Transfer Case Shift Encoder motor is manufactured to the same specifications as the factory actuators. The actuator features a redesigned housing to insure it lasts longer than the factory part. While this is NOT a genuine OEM part, it is a direct replacement for the factory 4WD actuator.

Why do you need a transfer case for AWD?

The transfer case is one of the most important components that distinguish all-wheel drive (AWD) and four-wheel drive (4WD) vehicles. Driving all four wheels provides superior traction, resulting in improved performance in challenging terrain.

Why does my Yukon XL have a 4WD light?

I was recently getting a service 4wd light in my 03 yukon xl. the lights for the switch also went out. I crawled under the truck and started looking at connections to the transfercase. I found that one of the connections had a small amount of corrosion in it. I pulled it apart, sprayed it with contact cleaner and reassembled.

Is it possible to transfer data from 2WD to 4WD?

I put it into 4WD (@ 1min) just to verify it’s not just doing it in 2WD and it’s doing it in 4WD as well. Later in the vid I switch it to Auto4WD (about 1:45) and it’s doing it there too. Another angle, I could also feel it by touching the case (@ 25sec) that it was indeed from the transfer case so my ears were not deceiving me.

Where is the transfer case on a 4WD car?

As previously mentioned, the transfer case is found on vehicles with AWD or 4WD capability and is integral in allowing drivers to switch to these modes of operation. A typical 4WD transfer case is found at the rear of the transmission. It is powered by the transmission output shaft and operates much like a secondary transmission.

What causes the transfer case control module to set?

The transfer case control module monitors the actuator current and sensor output to verify the proper position has been obtained. Deviations in current and position from expected values will cause this DTC to set if the ignition is ON and the system battery voltage is between 10.5–18 V.

How does the transfer case encoder motor work?

The transfer case encoder motor is a bi-directional DC motor. When energized through motor control A or motor control B, the ground connection is provided by the opposing motor control circuit, which is then grounded through the transfer case control module (TCCM) ground circuit.

Where is the encoder motor on a GM transfer case?

Access to datastream information for GM’s NVG 246 system makes most problems simple to locate and diagnose, as our case studies demonstrate. These systems also allow bidirectional control for many outputs. The encoder motor (arrow) is mounted on the front of the transfer case and is used to lock it into 4WD.

How to change the transfer case control moduel?

1. Try to communicate with the TCCM. If no communication, go to step 2. If communication is possible, go to step 5. 2. Remove the underhood (ATCM or TREC) TCCM fuse. 3. Wait 30 seconds. 4. Reinstall the fuse. The module should wake up and communicate with the Tech 2®. 5. Check for codes in the TCCM.