Speedometer Head: Testing and Inspection

NOTE: This article contains changes called out by TSB# PG008-05.





INSPECT SPEEDOMETER/ON-VEHICLE
Using a speedometer tester, inspect the speedometer for allowable indication error and check the operation of the odometer.

HINT: Tire wear and tire over or under inflation will increase the indication error.

If error is excessive, replace the speedometer.







INSPECT SPEEDOMETER RESISTANCE
Measure the resistance between terminals with fixing pointer to the stopper.
If resistance value is not as the specified, replace the meter.




INSPECT VEHICLE SPEED SENSOR OPERATION
a. Connect the positive (+) lead from battery to terminal 1 and negative (-) lead to terminal 2.
b. Connect the positive (+) lead from tester to terminal 3 and negative (-) lead to terminal 2.
c. Rotate shaft.
d. Check that there is a voltage change from approx. 0 V to 11 V or more between terminals 2 and 3.

HINT: The voltage change should be 4 times for every revolution of the speed sensor shaft.

If operation is not as specified, replace the sensor.