We compare the temperature-dependence of the in-plane and c-axis resistivity, ρ ab (T) and ρ c (T), of Bi 2 Sr 2 CaCu 2 O y . Measurements have been made on a thin film deposited on a vicinal substrate, examined in various doping states by removing oxygen in steps from the overdoped to very underdoped states. ρ c (T) exhibits a metallic behaviour at high T followed by a semiconducting-like behaviour at lower T, interrupted by the superconducting transition: ρ c (T) is minimum at T min and maximum at T P , T min is defined as the temperature where the pseudogap opens. T min , 1.4 larger than the temperature T ∗ , below which the pseudogap signature is seen in ρ ab (T), exhibits the same dependence on hole doping p. A phase diagram (T,p) is established with these characteristic temperatures. Interestingly ρ c (T) normalized by its value at T min obeys a scaling law vs T/T min . This confirms that T min is the important energy scale in the normal state c-axis transport.