MX-5 Miata Mazdaspeed L4-1.8L DOHC Turbo (2004)
5. Measure the segment groove depth of commutator.
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If not within the minimum specification, undercut the grooves to the standard depth.
Standard depth: 0.5 mm {0.02 in}
Minimum depth: 0.2 mm {0.008 in}
Magnetic switch
1. Inspect for continuity between terminals S and M using an ohmmeter.
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If there is no continuity, replace the magnetic switch.
2. Inspect for continuity between terminal S and the body using an ohmmeter.
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If there is no continuity, replace the magnetic switch.
3. Verify that there is no continuity between terminals M and B using an ohmmeter.
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If there is continuity, replace the magnetic switch.
