Vehicle Speed Sensor: Testing and Inspection

SPEED SENSOR

Inspection Of Voltage




1. Disconnect the 16-pin connector from the EC-AT control unit.
2. Remove the plug from the connector.
3. Connect a voltmeter between the 1 P terminal and ground as shown.
4. Turn the ignition switch ON.
5. Remove the speedometer cable from the transmission.





6. Slowly turn the speedometer cable one turn.
7. Check that approx. 7V is shown 4 times.
8. If not correct, check the speedometer.


TURBINE SENSOR

Inspection of Resistance
1. Disconnect the turbine sensor connector.




2. Check resistance at the terminals.

Resistance: Approx. 245 Ohms

3. If not correct, check voltage generation of the sensor.


Inspection of Voltage Generation
1. Remove the turbine sensor.
2. Connect a voltmeter (0.1 volt range) to the terminals.





3. Wave the the tip of turbine sensor approx. 5mm (0.197 in) away from a magnet and check that the sensor generates voltage.
4. If not correct, replace the turbine sensor.