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

Vehicle Speed Sensor-Circuit Testing:




1. Remove the instrument cluster.
2. Check continuity between terminals C230/3 (GRN/RED) and C229/14 (BLK) while rotating the speedometer cable shaft.
3. If there are not four pulses per shaft rotation, replace the vehicle speed sensor.