Put sugar, oil and eggs in a bowl and mix on low speed with beaters. Add the applesauce and beat til well mixed.
Combine flour, cocoa, baking soda, cinnamon and salt in a separate bowl and mix well. Beat flour into sugar mixture until just moist.
Add the zucchini and chocolate chips and stir until evenly mixed.
Spoon batter into the loaf pan and bake about 60 minutes until a toothpick inserted in the center comes out clean. Cool in pan about 10 minutes then remove the loaf and allow to finish cooling on a wire rack.