Mitsubishi Stealth 1994 Import Service Manual page 585

MULTIPORT FUEL INJECTION -
IGNITION COIL AND IGNITION POWER TRANSISTOR <DOHC>
connector
connector
OPERATION
When the ignition power transistor unit A is turned on by the signal from the engine control module,
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primary current flows to the ignition coil A. When the ignition power transistor unit A is turned off, the
primary current is shut off and a high voltage is induced in the secondary coil A, causing the ignition plugs
of No. 1 and No. 4 cylinders to spark. When the ignition power transistor unit B is turned off, the ignition
plugs of No. 2 and No. 5 cylinders spark. In addition, when the ignition power transister unit C is turned
off, the ignition plugs of No. 3 and No. 6 cylinders spark.
When the engine control module turns off the transistor in the module, the battery voltage in the module
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is applied to the ignition power transiistor unit to turn it on. When the engine control module turns on the
the module, the ignition power transistor unit is turned off.
transistor in
Tachometer
Engine control module
Engine control module connector
On-Vehicle Inspection of MFI Components
Battery
Ignition switch
23
5 v-
Spark
ment
connector
I