Operation CHARM: Car repair manuals for everyone.

Speedometer

The Speedometer pointer is moved by the magnetic field 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 Powertrain Control Module (PCM). The PCM processes this voltage into a square wave. The pulses generated are sent to the Speedometer at 4000 pulses per mile.