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

Component Tests and General Diagnostics

It is a Electrical Speedometer type.

Vehicles Speed Sensor Check:




Vehicle Speed Sensor Reed Switch Test:






1. Remove the vehicles speed sensor and connect as shown in the illustration, using a 3 - 10 Kilo-Ohms 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.)