Turn ignition off. Disconnect ABS Control Module (ABS CM) connector. See COMPONENT LOCATIONS . Connect Adapter Harness (49-F066-002) to ABS CM connector. Turn ignition on. Using voltmeter, measure voltage between terminal AB and terminals "E", "Z", "Y", AG, BA and BB of ABS CM connector. See Figure . Voltage on all terminals should be zero volts. If voltage is as specified, go to next step. If voltage is not as specified, check wiring harness and repair as necessary. If wiring harness is okay, go to step 3).
Apply 12 volts to terminal "B" and ground terminal AK of ABS CM connector. Using voltmeter, measure voltage between terminal AB and terminals "E", "Z", "Y", AG, BA and BB of ABS CM connector. See Figure . Voltage on all terminals should be 12 volts. If voltage is not as specified, check wiring harness. If wiring harness is okay, go to next step.
Remove valve relay from hydraulic unit. See Figure . Using ohmmeter, check continuity between terminals "B" and "C" of valve relay. See Fig 1 . Continuity should exist. Apply 12 volts to terminal "B" and ground terminal "C". Using ohmmeter, check continuity between terminals "A" and "D" of valve relay. Continuity should exist. If continuity is not as specified, replace valve relay.

Fig 1: Identifying Valve Relay Terminals

Courtesy of MAZDA MOTORS CORP.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Valve Relay