Calibration Test
Ensure tire pressure is at proper level. Using a reliable speedometer tester, compare reading on vehicle speedometer with reading on speedometer tester. If reading on vehicle speedometer does not fall within the acceptable range, replace speedometer. See SPEEDOMETER ALLOWABLE VARIATION table.
SPEEDOMETER ALLOWABLE VARIATION
| Vehicle Speed: MPH (km/h) |
Acceptable Range: MPH (km/h) |
| 10 (16) |
8.5-11.5 (13.7-18.5) |
| 20 (32) |
18.5-21.5 (29.8-34.6) |
| 40 (64) |
38.5-41.5 (62-66.8) |
| 55 (88.5) |
53.5-56.5 (86.1-91) |
| 75 (120.7) |
73.5-76.5 (118.3-123.1) |
| 100 (161) |
98.5-101.5 (158.5-163.3) |