Standard Cluster

SPEEDOMETER CLUSTER

Speedometer In Op Chart:

Speed Sensor And Buffer Amplifier Circuit:

The speedometer circuit consists of a driver and logic IC (integrated circuit) chips, a crystal oscillator, and some discrete electrical components. These components, diodes, resistors and capacitors, act as buffers, power surge suppressors and EMI protection by limiting and filtering the various input and output signals.

The Vehicle Speed Sensor (VSS) is a permanent magnet generator mounted in the transmission, designed to replace the transmission speedometer drive gear and sleeve. The purpose of the VSS is to provide an AC speed signal that is proportional to the vehicle speed at a rate of 4000 pulses per mile. This AC signal is transmitted to the buffer amplifier, filtered and conditioned, then transmitted to the speedometer circuitry.