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)

1000

900-1100

2000

1875-2125

3000

2850-3150

4000

3850-4150

5000

4850-5150

6000

5820-6180

7000

6790-7210

⁽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.