Tachometer: Testing and Inspection

Tachometer Inspection:

Connect engine tachometer and compare the engine tachometer and tachometer readings. Replace tachometer if difference is excessive.
Standard value:
Type 1 (8,000 rpm indication)
700 rpm ± 100 rpm
3,000 rpm ± 150 rpm
5,000 rpm ± 250 rpm

Type 2 (9,000 rpm indication)
700 rpm ± 1OO rpm
3,000 rpm +225/-100 rpm
5,000 rpm +325/-100 rpm

CAUTION: As the tachometer is negative grounded, do not connect battery conversely to prevent damaging transistor and diode.

Connect the engine tachometer.

1. Insert paper clip into the CRC filter connector (3-pole connector 0.5 W cable).
2. Connect the engine tachometer to the inserted

NOTE: For tachometer inspection, use of a fluxmeter-type engine tachometer is recommended. (Because a fluxmeter only needs to be clipped to the high tension cable.)