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
Provides vehicle speed signal and is sent to Powertrain Control Module (PCM) for calculations requiring this input.

OPERATION
Sensor is an alternating current generator. Voltage output varies with vehicle speed.