Front Wheel Speed Sensor On-Vehicle Inspection

Front and Rear Wheel Speed Sensor On-Vehicle Inspection

Output Voltage Inspection

1) Disconnect negative (-) cable from battery.
2) Hoist vehicle a little.
3) Disconnect wheel speed sensor connector.
4) Disconnect wheel speed grommet from vehicle body.
5) Set up measuring devices as shown in figure, the resistance to 115 ohms and the power supply voltage to 12 V.

NOTE:
Incorrect voltage or an improper connection will damage the wheel speed sensor.

Confirm that the power supply voltage and test connections are both correct.









6) Measure voltage at both ends of resistance without wheel rotation.

If voltage is out of specification, check sensor, mating encoder and their installation conditions.

Voltage at the resistance (115 ohms) without wheel rotation
680 to 960 mV

7) Measure voltage at both ends of resistance with wheel rotation and confirm voltage alternately changes between high and low voltages.

If voltage does not change with wheel rotation, check sensor, mating encoder and their installation conditions.

Voltage at the resistance (115 ohms) with wheel rotation
High voltage "a": 1360 to 1930 mV
Low voltage "b": 680 to 960 mV









Reference

When using oscilloscope for this check, check if peak-to-peak voltage and waveform meet specification.

Peak-to-peak Voltage at the resistance (115 ohms) with wheel rotation
High voltage "a": 1360 to 1930 mV
Low voltage "b": 680 to 960 mV