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Component Testing: Tachometer

Connect an external tachometer to engine. Start engine. Compare external tachometer readings with instrument cluster tachometer readings. Replace tachometer if gauge readings are not within acceptable range. See TACHOMETER TEST  .

CAUTION: When replacing tachometer, DO NOT  reverse wiring connections, as it will damage tachometer's transistors and diodes.
TACHOMETER TEST (1)

Engine Speed (RPM) (2) Acceptable Range (RPM)
Idle (3)
2000 1850-2150
3000 2800-3200
4000 3800-4200
5000 4800-5200
6000 5800-6200
7000 6700-7300
(1) Tests performed at ambient temperature of 77°F (25°C), with 13.5 volts at tachometer input power supply terminal.
(2) Speed indicated on external tachometer.
(3) Engine idle speed plus or minus 100 RPM.
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