Electron diffusion coefficients in bare and dye-adsorbed nanoporous TiO2 films filled with electrolytes are estimated using a pulsed laser in the presence and absence of a continuous light irradiation. It is found that the orders of estimated values of the diffusion coefficients are in agreement regardless of the existence of the bias light. Using a UV pulse measurements without bias light, influence of the dye adsorption on electron transport is found in the increase of the electron diffusion coefficient in the films. The measurement without bias light seems to be able to provide a convenient method to compare the electron transport properties among various nanoporous TiO2 films and to study the influence of surface adsorption on electron transport in the films.