How does the AWD work on the 2003 CR-V?

Discussion in 'CR-V' started by Steven Holmes, Apr 3, 2004.

  1. Hi

    I have a 2003 AWD CR-V. I know how the system works technically, but what I
    am wondering is, when wheels begin to slip, and the AWD kicks in, how long
    does the car stay in AWD for? In other words, once AWD starts up, does it
    stay there until I brake, until the car slows to a stop again, until the
    engine is turned off and then on?


    Steven Holmes, Apr 3, 2004
  2. Steven Holmes

    null_pointer Guest

    I recently read somewhere that there are two small oil pumps, one
    driven by the drive shaft, the other by the rear wheels. Their output
    is directed to opposing sides of a piston. When the front wheels slip
    the drive shaft pump turns faster causing the piston to move causing a
    clutch pack to engage the rear wheels. As soon as the wheels are
    turning at the same speed the oil pressure on both sides of the piston
    equalizes and the piston returns to it's central position and the rear
    wheels disengage. Don't take this as the gospel's just
    something I read on the internet.
    null_pointer, Apr 3, 2004
  3. I recently read somewhere that there are two small oil pumps, one
    Almost right. If that was the case, as soon as it engaged, it would then
    disengage again, slip, re-engage, and so on.

    There are two pumps, as you mentioned, pumping differential fluid from the
    rear diff. One pump is in the transmission, the other runs off the rear
    diff. The drive shaft to the rear diff turns continuously, but is not
    connected to the wheels in normal driving, which keeps mileage up. When the
    front wheels turn faster than the rear, there is a pressure differential
    between the pumps, and a multiplate clutch in the rear diff system engages,
    transferring torque to the rear wheels. This clutch remains engaged as long
    as there is torque available. As soon as you let up off the gas, the clutch
    disengages and you are back in FWD mode.
    Scott MacLean, Apr 3, 2004
  4. ================

    Nul_pointer is right.. (if it's the same as the 1st generation CRV) two
    opposing pumps inside the rear diff. If front or rear wheels spin
    faster, the rear diff locks up to transfer torque to whatever is
    slipping. It's over as soon as it starts because your wheels all start
    turning the same speed right away. Great at icy intersections and

    If you lock up the rear wheels on a AWD CRV, the fronts will lock up too
    (almost completely). In other words, you can't put it into one of those
    'park-brake-skids' that I used to find so handy for burning a U-turn on
    my icy driveway. :-( has resources that explain this.
    'Curly Q. Links', Apr 3, 2004
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