626 2.5L
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 Mazda Protege5, 2002 Mazda Protege, 2002 Mazda Millenia, 2002 Mazda MX-5 Miata, and 2002 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect CMP sensor harness connector. CMP sensor is located next to right timing pulley. Using ohmmeter, measure resistance between CMP sensor terminals "A" and "B". Resistance should be approximately 550 ohms. If resistance is not as specified, check related wire harnesses for short or open circuit(s). If wire harnesses are okay, replace CMP sensor.