Ignition Control System - Subaru LEGACY 2002 Quick Reference Index

6. Ignition Control System

! The ignition system is controlled by the ECM.
The ECM monitors the operating condition of the engine using the signals from the sensors and
switches shown below and determines the ignition timing most appropriate for each engine oper-
ating condition. Then it sends a signal to the ignitor, commanding generation of a spark at that
timing.
! The ECM uses a preprogrammed map for a "closed-loop" control which provides its ignition tim-
ing control with excellent transient characteristics, i.e., highly responsive ignition timing control.
(12)
(11)
(10)
(1) ECM
(2) #1 Ignition coil
(3) #3 Ignition coil
(4) #5 Ignition coil
(5) Camshaft position sensor
(6) Pressure sensor
(7) Intake air temperature sensor
(8) Crankshaft position sensor
IGNITION CONTROL SYSTEM
(1)
(13)
(14)
(9) (7)
(8)
Emission Control (Aux. Emission Control Devices)
(15)
(6)
(9) Throttle position sensor
(10) #6 Ignition coil
(11) #4 Ignition coil
(12) #2 Ignition coil
(13) Engine coolant temperature sensor
(14) Knock sensor LH
(15) Knock sensor RH
EC-9
(2)
(3)
(4)
(5)
B2H3970A