Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Vehicle Speed Sensor: Description and Operation

PURPOSE/OPERATION
The vehicle speed sensor is supplied with 5 Volts from the powertrain control module. The speed sensor turns on and off (opening and closing the circuit) in proportion to how fast it is turning. The powertrain control module interprets this signal as the vehicle speed.