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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5
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CAMSHAFT POSITION (CMP) SENSOR INSPECTION [SKYACTIV-G 2.0]

Intake CMP Sensor

Visual inspection

CAUTION:

  • When replacing the intake CMP sensor, make sure there is no foreign matter on it such as metal shavings. If it is installed with foreign matter, the sensor output signal will malfunction resulting from fluctuation in magnetic flux and cause a deterioration in engine control.

1. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)
2. Remove the following parts:
a. Seal cover (See SEAL COVER REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
b. Front suspension tower bar (Vehicles with front suspension tower bar) (See FRONT SUSPENSION TOWER BAR REMOVAL/INSTALLATION.)
c. Intake manifold (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
3. Disconnect the intake CMP sensor connector.
4. Remove the bolt. (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
5. Remove the intake CMP sensor. (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
6. Verify that there are no metal shavings on the intake CMP sensor.

  • If there is a malfunction, remove any metal shavings that are adhering.

Voltage inspection

CAUTION:

  • When replacing the intake CMP sensor, make sure there is no foreign matter on it such as metal shavings. If it is installed with foreign matter, the sensor output signal will malfunction resulting from fluctuation in magnetic flux and cause a deterioration in engine control.

  • If the wiring harnesses or waterproof connectors are damaged, water penetrating the connector will cause a sensor malfunction. To prevent this, be careful not to damage wiring harnesses or waterproof connectors.

1. Idle the engine.
2. Measure the intake CMP sensor output voltage wave pattern using an oscilloscope.

  • Specification

    • 4.8 V or more (Maximum value of wave pattern)

    • 0.8 V or less (Minimum value of wave pattern)

Wave pattern (reference)

Oscilloscope setting

  • 2 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition

  • Idle (after warm up and no load)

Exhaust CMP Sensor

Visual inspection

CAUTION:

  • When replacing the exhaust CMP sensor, make sure there is no foreign matter on it such as metal shavings. If it is installed with foreign matter, the sensor output signal will malfunction resulting from fluctuation in magnetic flux and cause a deterioration in engine control.

1. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)
2. Remove the front suspension tower bar (joint). (Vehicles with front suspension tower bar) (See FRONT SUSPENSION TOWER BAR REMOVAL/INSTALLATION.)
3. Disconnect the exhaust CMP sensor connector.
4. Remove the bolt. (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
5. Remove the exhaust CMP sensor. (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
6. Verify that there are no metal shavings on the exhaust CMP sensor.

  • If there is a malfunction, remove any metal shavings that are adhering.

Voltage inspection

CAUTION:

  • When replacing the exhaust CMP sensor, make sure there is no foreign matter on it such as metal shavings. If it is installed with foreign matter, the sensor output signal will malfunction resulting from fluctuation in magnetic flux and cause a deterioration in engine control.

  • If the wiring harnesses or waterproof connectors are damaged, water penetrating the connector will cause a sensor malfunction. To prevent this, be careful not to damage wiring harnesses or waterproof connectors.

1. Idle the engine.
2. Measure the exhaust CMP sensor output voltage wave pattern using an oscilloscope.

  • Specification

    • 4.8 V or more (Maximum value of wave pattern)

    • 0.8 V or less (Minimum value of wave pattern)

Wave pattern (reference)

Oscilloscope setting

  • 2 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition

  • Idle (after warm up and no load)

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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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