Millenia 2.5L
WARNING: This page is about a different car, the 2001 Mazda Protege, 2001 Mazda Millenia, 2001 Mazda MX-5 Miata, 2001 Mazda MPV, and 2001 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
CMP sensor is located inside of distributor and is an integrated part. Disconnect distributor 6-pin harness connector. Using ohm meter, check continuity between distributor connector terminals "B" and "D". If continuity is present, replace distributor. If continuity is not present, repair wire harness as necessary.