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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Crankshaft Position Sensor: Fundamentals and Basics

Crankshaft sensor output should be:
2.4 V (AC) @ idle (approximate)
5.0 V (AC) @ 3000 rpm (approximate)

If the vehicle does not start you should expect a reading of approximately .8 - 1.0 V (AC) while cranking.

AC Voltage is read by connecting a DVOM to both pins of the sensor (via backprobing) on the AC voltage setting. Readings can also be taken at the engine control module by backprobing the appropriate pins (see wiring diagram).