Originally Posted by jimkate
Are the Honda Pilots AWD (All Wheel Drive) or 4WD (4 wheel drive) ? I understood that our 2005 is AWD. It's a great toad.
My 2005 Acura MDX is rated for 4 down towing. Other years of CRV, Pilot, MDX and TL-AWD may or may not be. I would stick with the factory recommendation, which is found in the owner's manual for the particular model. Honda customer relations in CA can also give you the info.
Actually, Honda/Acura use a proprietary system called VTM-4. It is one of many versions of All Wheel Drive available in the marketplace. It actually combines the advantages of old-style 4WD with a manual transfer case, and the more modern designs of AWD that "cut in" as needed.
This article covers the new electronically controlled limited/locking axle found in the Honda Pilot and Acura MDX termed as the Variable Torque Management (VTM-4) system. The VTM-4 system contains a control module, which controls current to two electro-magnetic coils that act on a mechanical wet-clutch. The system can operate from 0 percent torque delivery up to 53 percent of torque delivery, based on conditions and preemptive strategies. One of the great benefits of the VTM-4 is the ability to initiate a variety of operational strategies, including delivering torque to the rear wheels before wheel slip even occurs. The following defines the operating modes of the VTM4.
Acceleration: Based on a variety of inputs, such as engine load and speed, the VTM-4's control module pulse-width-modulates (PWM) the coils in the axle assembly to control amount of torque transfer to the rear wheels. This is a proactive measure to prevent the wheels from loosing traction on acceleration.
Cruise or Coast: When in cruise or coast mode, the VTM-4 reduces the torque transfer to the rear wheels to zero in order to improve fuel efficiency and driveability.
Limited Slip: In the event of a loss of traction, the VTM-4 control module has the ability to control each coil in the rear axle in order to deliver torque to the wheel with the most traction.
Locking: When the vehicle is placed in Manual 1st or 2nd and the VTM-4 button is pressed, the differential initiates full lock (5 amps to the coils) until the vehicle reaches 6mph. At that point, the control module decreases current flow to the coils until the vehicle reaches 18mph, where the current flow is decreased to zero amps.
How does it work?
About the only thing that the VTM-4 has in common with a conventional rear axle assembly is a drive pinion and ring gear. Upon disassembly, you will find an oil pump incorporated within the carrier and two multiple disc clutch assemblies on each end of the rear axle housing.