Continuity Test
- Check METER fuse and ABS warning light bulb. Check wiring harness between ABS warning light and ABS control unit, and between ABS warning light and hydraulic unit. Repair or replace as necessary. Disconnect hydraulic unit connector. On Miata, connect positive lead of DVOM to Blue/Yellow wire terminal and negative lead to Green/Yellow wire terminal of hydraulic unit connector. See Fig 1
.
- 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 hydraulic unit.
Courtesy of MAZDA MOTORS CORP.