Calibration Test
Ensure tire pressure is correct. Using a calibrated, reliable speedometer tester, compare speedometer tester readings to vehicle speedometer readings. If vehicle speedometer readings are not within range of allowable variation, replace speedometer. See SPEEDOMETER ALLOWABLE VARIATION .
SPEEDOMETER ALLOWABLE VARIATION
| MPH | Allowable Range - MPH |
|---|---|
| 10 | 9.1-10.6 |
| 30 | 28.6-30.6 |
| 60 | 48.1-50.6 |
| 70 | 67.5-70.6 |
| 90 | 86.9-90.5 |