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




The sensor is mounted on the sensor case (distributorless ignition case) on the camshaft left side. The signal rotor is press-fitted onto the camshaft. As the sensor has a built-in hall element (element which generates voltage from changes in the magnetic flux) and a waveform forming circuit, it converts changes in the magnetic flux caused by rotation of the signal rotor into electric pulse signals. Using this signal and the signal from the CKP sensor, ECM (PCM) identifies the cylinder whose piston is in the compression stroke.

Cylinder Identification: