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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Knock Sensor: Description and Operation
Operation In vehicles equipped with 6 or 8 cylinder engines, Electronic Spark Control
(ESC) is used in conjunction with EST to reduce spark advance when detonation occurs. A
knock sensor signals a separate ESC controller to retard the timing when it senses knock. The ESC controller signals the ECM which will reduce spark advance until no more signals are received from the knock sensor.