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
Vehicle Speed Sensor (VSS):
The Vehicle Speed Sensor (VSS) consists of the lead switch and magnet that is built into the speedometer. As the magnet turns with the speedometer cable, its magnetic force causes the lead switch to turn "ON" and "OFF." Such "ON/OFF" frequency increases or decreases in proportion with the car speed and is sent to the ECM as pulse signals.
