Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2004 WRX STi 08. MECHANISM AND FUNCTION 13. EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) 06. Ignition Control System
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W1860BE.book Page 9 Tuesday, January 28, 2003 11:01 PM
IGNITION CONTROL SYSTEM
EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)
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 operat-
ing condition. Then it sends a signal to the igniter, commanding generation of a spark at that timing.
The ECM uses a preprogrammed map for a "closed-loop" control which provides its ignition timing
control with excellent transient characteristics, i.e., highly responsive ignition timing control.
(1) (2)
(5)
(3)
(4)
(8)
(6)
(6) (6)
(7)
(6)
(9)
EC-00072
(1) Battery (6) Ignition coil and igniter assembly
(2) Ignition switch (7) Knock sensor
(3) ECM (8) Mass air flow and intake air temperature sensor
(4) Camshaft position sensor (9) Engine coolant temperature sensor
(5) Crankshaft position sensor
EC(H4DOTC)-9
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