Component Testing: Tachometer
Connect an external tachometer to engine. Start engine. Compare readings of external tachometer with tachometer gauge in instrument cluster. See TACHOMETER TEST . If external tachometer RPM is not within cluster tachometer specification range, replace cluster tachometer.
CAUTION:
When replacing tachometer, DO NOT
reverse wiring connections or damage to tachometer's transistors and diodes will result.
TACHOMETER TEST (1)
| External Tachometer RPM | Cluster Tachometer | ||
|---|---|---|---|
| 750 | 650-850 | ||
| 2000 | 1900-2100 | ||
| 3000 | 2850-3150 | ||
| 4000 | 3800-4200 | ||
| 5000 | 4750-5250 | ||
| 6000 | 5700-6300 | ||
| 7000 | 6650-7350 | ||
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