MX-5 Miata Mazdaspeed L4-1.8L DOHC Turbo (2004)
2. Inspect the following wiring harnesses for an open or short circuit by probing the applicable sensor and PCM terminals with ohmmeter leads.
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If there is an open or short circuit, repair or replace wiring harnesses.
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If there is no open or short circuit, replace the CMP sensor.
Open circuit
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CMP signal circuit (CMP sensor connector terminal B and PCM connector terminal 3V)
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Power circuit (CMP sensor connector terminal A and main relay terminal D through common connector)
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GND circuit (CMP sensor connector terminal C and PGM connector terminal 4A)
Short circuit
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CMP signal circuit (CMP sensor connector terminal B and PCM connector terminal 3V to GND)
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Power circuit (CMP sensor connector terminal A and main relay terminal D through common connector to GND)
3. Reconnect the CMP sensor connector.
4. Inspect the protrusion of camshaft (intake side) for damage and cracks.
