Operation CHARM: Car repair manuals for everyone.
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: Testing and Inspection

Checking VSS:





- Disconnect negative cable at battery.
- Remove combination meter from instrument panel.
- Connect ohmmeter between "GND" screw and "RSW" screw of combination meter and turn cable joint of speedometer with a screwdriver.
- Ohmmeter indicator should move back and forth between 0 (zero) and oo (infinity) 4 times while cable joint is turned one full revolution.
- Replace speedometer if check result is not satisfactory.
- Install combination meter to instrument panel.
- Connect negative cable to battery.