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 assembly. See SPEEDOMETER ALLOWABLE VARIATION  .

1. If speedometer needle deflects beyond maximum point, will not return to zero or will not exceed a certain point, check for oil or foreign material in speedometer head or for deformed hair spring. Replace components or speedometer if defective.
2. If speedometer or odometer will not operate, check for improperly connected speedometer cable, broken speedometer cable or damaged driven gear. Replace defective components.
3. If speedometer deflects erratically, check for improper cable routing or defective cable. If speedometer operates but odometer or trip meter does not operate, check for defective gear in speedometer. Replace defective components.