MX-5 Miata Mazdaspeed L4-1.8L DOHC Turbo (2004)
Camshaft Position Sensor: Component Tests and General Diagnostics
CAMSHAFT POSITION (CMP) SENSOR INSPECTION
Visual Inspection
1. Remove the CMP sensor. (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION.)
2. Make sure that the CMP sensor is free of any metallic shavings or particles.
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If metallic shavings or particles are found on the sensor, clean them off.
3. Install the CMP sensor. (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION.)
Wave Profile Inspection
1. Remove the PCM. (See PCM REMOVAL/INSTALLATION.)
2. Connect WDS or equivalent to DLC-2 connector.
3. Connect oscilloscope testleads to the following PCM connector terminals.
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(+) lead: PCM terminal 3V
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(-) lead: PCM terminal 4A
4. Start the engine.
5. Monitor RPM PID.
6. Inspect wave profile when idling engine.
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If wave profile or voltage are out of specifications, carry out the "Circuit Open/Short Inspection"
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PCM terminal: 3V (+) <-> 4A (-)
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Oscilloscope setting: 2.0 V/DIV (Y), 20 ms/DIV (X), DC range
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Vehicle condition: Idling
Circuit Open/Short Inspection
1. Remove the PCM. (See PCM REMOVAL/INSTALLATION.)
