Mazda 6 Service Manual: Front/rear abs wheel-speed sensor inspection

Visual Inspection

Remove the wheel and tire, and inspect the sensor for looseness and damage. Replace the sensor if necessary.

Clearance Inspection

Inspect the clearance between the wheel-speed sensor and the sensor rotor.

Clearance
0.3-1.1 mm {0.012-0.043 in}

Resistance Inspection

1. Disconnect the ABS wheel-speed sensor connector.

2. Inspect the resistance at the ABS wheel-speed sensor.

• If not as specified, replace the ABS wheel-speed sensor.

Resistance
1.3-1.7 kilohm

Voltage Inspection

1. On level ground, jack up the vehicle and support it evenly on safety stands.

2. Disconnect the ABS wheel-speed sensor connector.

3. Inspect each sensor by rotating each wheel one revolution per second.

• If not as specified, replace the ABS wheel-speed sensor.

Voltage
0.25-1.2 V (AC)

Voltage Pattern Inspection

1. On level ground, jack up the vehicle and support it evenly on safety stands.

2. Disconnect the ABS wheel-speed sensor connector.

3. Using an oscilloscope, inspect voltage pattern for distortion and noise by rotating each wheel.

• If there is distortion or noise, inspect the ABS sensor rotor.