  Using the 9 inverse femtobarn data sample collected with the CLEO II.V
detector at the Cornell Electron Storage Ring, we have studied the resonant
substructure of the Cabibbo suppressed decay D0 -> pi+ pi- pi0. We observe
significant contributions from the rho- pi+, rho+ pi-, rho0 pi0, and
non-resonant channels, and present preliminary results of the amplitudes,
phases, and fit fractions for these sub-modes. No evidence for the sigma(500)
or more massive rho resonances was found. We observe no CP violation, finding
Acp = 0.01 +0.09 -0.07 +- 0.09.
