Mitsubishi 3000GT Service Manual page 262

IGNITION COIL AND IGNITION POWER TRANSISTOR
A Harness side A Harness side
connector connector
side
connector
B-l
OPERATION
When the ignition power transistor unit A is turned on by the signat 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
transistor 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
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module is applied to the ignition power transistor unit to turn it on. When the engine control module
turns on the transistor in the module, the ignition power transistor unit is turned off.
MULTIPORT
On-Vehicle Inspection of MFI
FUEL INJECTION - Components
B-2
Engine control module 101
TSB Revision
Battery
,
iransistor
5 v
Spark