MX-5 Miata Mazdaspeed L4-1.8L DOHC Turbo (2004)
Variable Valve Timing Solenoid: Testing and Inspection
Inspection Using An Oscilloscope (Reference)
Oil control valve (OCV) signal
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PCM terminal: 4D (+) <-> 4A (-)
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Oscilloscope setting: 2.0 V/DIV (Y), 0.5 ms/DIV (X), DC range
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Vehicle condition: Idling after warm-up (no electrical load)
