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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Ignition Control Module: Description and Operation
The igniter unit is located inside the distributor. The
igniter is used as a control device for the ignition coil. It is powered by ignition switch terminal Ign. 1 and receives power anytime the switch is turned ON. Based on the information provided by the TDC and CRANK sensors, the
ECU pulses pins B15 and B17. Each time the igniter is pulsed, the ignition coil is signaled to send a spark to a spark plug. By modifying the pulse supplied to the igniter the ECU is able to retard or advance ignition timing as conditions require.