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)

Or, hide this message: temporarily or permanently

Vehicle Speed Sensor Inspection

Vehicle Speed Sensor Inspection:






1. Remove the vehicles speed sensor and connect as shown in the illustration, using a 3 - 10 kOhms resistance.

2. Use a voltmeter to check for voltage at terminals 2 and 3 when the pulse generator shaft is turning. (One revolution is four pulses.)