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)
Or, hide this message:
temporarily or
permanently
Vehicle Speed Sensor: Description and Operation
DESCRIPTION The
Vehicle Speed Sensor (VSS) consists of a reed switch built into the speedometer head. As the magnet turns with the speedometer cable, its magnetic field causes the reed switch to turn "ON" and "OFF."
OPERATION The "ON," "OFF" frequency increases or decreases in proportion with the vehicle speed and is sent to the ECM as a digital signal.