Page 50 - 2006 HARLEY FLSTCI SERVICE MANUAL

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Figure 2-12. Reset Switch 2006 Softail: Instruments

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SPEEDOMETER THEORY OF OPERATION The speedometer consists of a vehicle speed sensor, ICM/ ECM, odometer reset switch and the speedometer. The vehi- cle speed sensor is mounted on the right side of transmission case below the starter. The sensor circuitry is that of a Hall- Effect sensor that is triggered by the gear teeth of 4th gear on the transmission mainshaft. The output from the sensor is a series of pulses that are inter- preted by ICM/ECM circuitry, converted into serial data inside the ICM/ECM then sent to the speedometer to control the position of the speedometer needle and the liquid crystal (LCD) odom

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