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:
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lemon-manuals.org.ua
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Vehicle Speed Sensor: Description and Operation
The
vehicle speed sensor, on the transmission, provides the ECM with vehicle speed information.
It consists of a reed switch and magnetic rotor turned by the speedometer cable. One rotation of the magnetic rotor opens and closes the reed switch four times, producing a digital signal which is converted to vehicle speed by the ECU.