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 logical successor to CHARM, I recommend you try it!

Link: lemon-manuals.la

18X Crank Sensor

Scan tool displays 0 to 1200 RPM. This signal is produced by the ignition control module and is fed to the PCM to calculate engine RPM below 1200 RPM.