Tachometer: Testing and Inspection

INSPECT TACHOMETER ON-VEHICLE
a. Connect a tune-up test tachometer, and start the engine.






NOTE: Reversing the connection of the tachometer will damage the transistors and diodes inside.

b. Compare the tester and tachometer indications.
If error is excessive, replace the tachometer.

RPM (DC 13.5 V,25 °C (77 °F))







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