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Home › Mazda › 1997 › MX-5 Miata Base, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls - System/Component Tests › Engine Sensors & Switches › Camshaft Position (CMP) Sensor

Camshaft Position (CMP) Sensor

  1. Disable ignition coils. Disconnect fuel injector connector. CMP sensor is located on left rear of engine. Remove CMP sensor, leaving electrical connector connected. Using analog voltmeter (or oscilloscope), connect negative lead to CMP sensor ground (CMP sensor body or Black/Blue wire).
  2. With voltmeter positive lead, backprobe White wire. Turn ignition on. Rotate CMP shaft and observe voltage reading. Voltmeter should indicate 4 voltage pulses (5 volts) per revolution. Move positive voltmeter lead to Yellow/Blue wire terminal. Rotate CMP sensor shaft. Voltmeter should indicate 2 voltage pulses (5 volts) per revolution. Replace CMP sensor as necessary.
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