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
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Ignition Control PCM Output
The
PCM provides a
zero volt (actually about
100 mV to
200 mV) or a
5-volt output signal to the ignition control (IC) module. When the ignition control (IC) module receives the
5-volt signal from the PCM, it provides a ground path for the B+ supply to the primary side of the coil and creates a magnetic field in the coil. When the PCM shuts off the
5-volt signal to the
ignition control module, the ground path for the primary coil is broken. The magnetic field collapses and induces a high voltage secondary impulse which fires the
spark plug and ignites the
air/fuel mixture.