Component Tests: Tachometer

CAUTION: Reversing the connection of the tachometer will damage the transistors and diodes inside. When removing and installing the tachometer, be careful not to drop or subject it to heavy shocks.

On-Vehicle Inspection - Connect a tune-up test tachometer and start the engine. Compare the tester and tachometer indications (DC 13.5 Volts at 77°F (25°C)). See INSPECTING TACHOMETER ON-VEHICLE table.

INSPECTING TACHOMETER ON-VEHICLE

Standard Indication	Allowable Range
700	630-770
1000	900-1100
2000	1850-2150
3000	2800-3200
4000	3800-4200
5000	4800-5200
6000	5750-6250
7000	6700-7300

Resistance Inspection - Measure the resistance between terminals with fixing pointer to the stopper. See CONNECTOR IDENTIFICATION . See INSPECTING RESISTANCE WITH FIXING POINTER TO STOPPER table. If the resistance value is not as specified, replace the meter. See COMBINATION METER under REMOVAL & INSTALLATION.