Front and Rear Wheel Speed Sensor On-Vehicle Inspection

Front and Rear Wheel Speed Sensor On-Vehicle Inspection

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.

Output Voltage Inspection

1) Disconnect negative (-) cable at battery.
2) Hoist vehicle a little.
3) Disconnect wheel speed sensor connector (1).
4) Set up measuring devices as shown in figure.











5) Measure voltage at both ends of resistance without wheel rotation. If check result is not as specified, check sensor, mating encoder and their installation conditions.

Voltage at resistance (75ohms) without wheel rotation.
443 - 630 mV

6) Measure voltage at both ends of resistance with wheel rotation and check high (1) and low (2) voltages are in specification. Confirm that waveform is not disordered.

Voltage at resistance (75ohms) with wheel rotating.
LO voltage 443 - 630 mV
HI voltage 885 - 1260 mV