Speedometer Head: Description and Operation

The speedometer and odometer are electrically driven by the Vehicle Speed Sensor (VSS), which is mounted to the transaxle. The VSS is driven by the output shaft of the transaxle and sends eight pulses of alternating current to the instrument cluster per one rotation of the speedometer driven gear. The VSS also transmits information to the speed control system.

Areas of concern that may affect speedometer readings are:
- Tires
- Speedometer/odometer drive gears
- VSS, including the driven gear

Improper tire rolling radius, inflation pressure, temperature, and size may contribute to inaccurate system readings. System accuracy testing should be performed after the tires are set to the correct pressure as shown on the safety compliance certification label. The tires should also be warmed for a short period before testing for accuracy. Best results are obtained on smooth, dry pavement while driving at a constant speed within the posted speed limit.

The standard speedometer on the base model reads to 193 kph (120 mph), while the speedometer on the GT reads to 225 kph (140 mph).