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Continuity Test

  1. Unplug hydraulic unit 12-pin connector. On Miata, connect positive lead of DVOM to Blue/Yellow wire terminal and negative lead to Gray wire terminal of hydraulic unit. On RX7, connect positive lead of DVOM to Red wire terminal and negative lead to Yellow/Red wire terminal of hydraulic unit.
  2. On 929, connect positive lead of DVOM to Violet wire terminal and negative lead to Yellow/Red wire terminal of hydraulic unit. Ensure continuity is present between terminals. Reverse DVOM leads. Continuity should not be present with leads reversed. If ABS diode does not test as described, replace ABS diode.
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