Front Speed Sensor

Fig. 171 Front & Rear Speed Sensor Inspection.:

1. Connect oscilloscope to speed sensor connector.
2. Run vehicle at 12.4 mph and inspect speed sensor output wave, Fig. 171.
3. Ensure C is at least 0.5 volts, Fig. 171. If it is not, replace speed sensor.
4. Ensure B is 30% more of A. If it is not, replace driveshaft.