Integrated Wheel End (IWE) System

Four Wheel Drive (4WD) Systems

Integrated Wheel End (IWE) System

The IWE system consists of the following components:

- Vacuum reservoir
- IWE solenoid
- IWEs (spring-loaded vacuum hubs)
- Vacuum hoses
- Check valve

The IWE system, used on both MSOF and ESOF equipped vehicles, uses vacuum hubs that engage or disengage the front wheel hubs from the front halfshafts.

The IWE solenoid receives engine vacuum from the vacuum reservoir. When the 4WD system is in 2H mode, the TCCM supplies a ground path to the IWE solenoid to apply vacuum to the IWEs (disengaging the front hubs from the front halfshafts). In 4H or 4L modes, the TCCM does not supply the ground path to the IWE solenoid, vacuum is not applied to the IWEs and an internal spring keeps the front hubs engaged to the front halfshafts.