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

Camshaft Position Sensor: Description and Operation

Distributor:





A Hall Effect type Camshaft Position Sensor (CMP) is used to detect when number one cylinder is at top dead center. This information is sent to the Powertrain Control Module (PCM), where it is used to control fuel injection timing.