October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.
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.