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
The
knock sensor is mounted to the engine block under the intake manifold. The sensor is used to detect engine detonation. If knock is detected, the PCM will retard the spark timing based on the signal from the knock sensor. The PCM will always try to work back to zero compensation level or not spark retard. This new type of knock sensor, flat response, is not like the resonant sensor which was tuned for the engine. The flat response sensor creates a broader signal that is filtered within the PCM.