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 Inspection

Vehicle Speed Sensor Inspection

1. Remove the connector from the vehicle speed sensor. Connect 12 volt power supply and voltmeter to the terminal. Do not mistake polarity.

2. Rotate the driven gear.
3. Observe the voltage.
Important: The voltage value will change from approximately 0 to 12 to 0 volts per pulse (1). There will be 4 pulses per revolution (2).

4. If the result of the inspection are not desired, replace the vehicle speed sensor.