Vehicle Speed Sensor: Operation

• The vehicle speed sensor is incorporated within the speedometer. It converts vehicle speed data to pulse signals and inputs those signals to the engine control unit. The engine control unit, based upon those signals, regulates the idle speed servo, etc.
• The vehicle speed sensor, by intermitting the flow (to ground) of the 5-volt signal applied from the engine control unit, produces vehicle speed signals. See Fig 1 .

Fig 1: Identifying Vehicle Speed Sensor Circuit

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.