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 |
|---|---|
| 20 | 20-23 |
| 40 | 40-43.5 |
| 60 | 59.5-63.5 |
| 80 | 79.5-84 |