Mitsubishi MOTORS CARISMA 1996, Service Bulletin

Page: 141 / 232

2
IGNITION SYSTEM
GENERAL INFORMATION
This system is equipped with four ignition coils with
built-in power transistors for each of the cylinders.
Interruption of the primary current flowing in the primary
side of an ignition coil generates a high voltage in the
secondary side of the ignition coil. The high voltage thus
generated is applied to the spark plugs to generate
sparks. The Engine-ECU turns the power transistors
inside the ignition coils alternately on and off. This
causes the primary currents in the ignition coils to be
alternately interrupted and allowed to flow to fire the
cylinders in the order 1 - 3 - 4 - 2. The Engine -ECU determines which ignition coil should
be controlled by means of the signals from the camshaft
position sensor and the crank angle sensor . It also
detects the crankshaft position, in order to provide
ignition at the most appropriate timing in response to the
engine operation conditions. When the engine is cold or
running at high altitudes, the ignition timing is slightly
advanced to provide optimum performance.
Furthermore, if knocking occurs, the ignition timing is
gradually retarded until knocking ceases
SYSTEM DIAGRAM
IGNITION COIL SPECIFICATION
Items Specification
Type Molded 4-coil
SPARK PLUG SPECIFICATION
Items Specification
NGK PZFR6B
ENGINE ELECTRICAL - Ignition System
16-19
9FU0839
Ignition switch
Battery
Air flow sensor
Barometric pressure sensor
Intake air temperature sensor
Engine coolant temperature sensor
Idle position switch
Camshaft position sensor
Crank angle sensor
Ignition switch-ST
Detonation sensor
Vehicle speed sensor
Inhibitor switch <A/T>
Cylinder No.
Spark plug
Ignition coil
Engine-ECU
To tachometer
IZFR6B
<New>
<Old>
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