ABS Control Relay
- Remove ABS control relay. See Figure. Using ohmmeter capable of testing diodes, check for continuity between ABS control relay connector terminals A3 and A4. See Fig 1. Transpose ohmmeter leads. Repeat measurement.
- If continuity exists or circuit is open for both measurements, actuator diode is defective. Repair or replace relay, then go to next step. If continuity exists for only one measurement, temporarily substitute known good ABS ECU. Retest system.
- Continuity should exist between terminals A3 and A6, between terminals A3 and A5, and between terminals A5 and A6.
- Continuity should not exist between terminals A2 and A3, or between terminals B1 and B2.
- Using fused jumper wire, connect positive battery terminal to terminal B3. Connect negative battery terminal to terminal B4. Continuity should not exist between terminals B1 and B2.
- Using fused jumper wire, connect positive battery terminal to terminal B3. Connect negative battery terminal to terminal A1. Continuity should exist between terminals A2 and A5. Continuity should not exist between terminals A3 and A5. Replace relay if operation is not as specified.
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