Operation CHARM: Car repair manuals for everyone.

Speedometer


The Speedometer pointer is moved by the magnetic fields of two coils. These coils are driven by a solid state unit.

The Vehicle Speed Sensor, located in the transaxle, generates an AC voltage that is sent to the Engine Control Module (ECM). The ECM processes this voltage into a square wave. The pulses generated are sent to the Speedometer at 4000 pulses per mile.