Civic Hatchback L4-1493cc 1.5L SOHC (D15B1) TBI (1990)
Igniter: Description and Operation
Igniter Unit
The igniter unit, located inside the distributor housing, controls ignition timing and is itself controlled by the ECU. The ECU contains memories for
basic ignition timing at various engine speeds, manifold pressures and coolant temperatures. The ECU retards or advances the timing by manipulating
the ignition output signal to match these memories through the igniter unit.