FUEL SYSTEM On-vehicle Inspection of MPI Components
IGNITION COIL AND POWER TRANSISTOR
Equipment side
connector
Harness side
connector
Harness side connector
Tachometer
Battery
coil
3
Engine control unit
“
8
“
6
,
5
23
No. 2
No. 3
No 5
No. 6
t r a n s i s t o r
adjust-
ment
11
5 V
Engine control unit connector
OPERATION
l
When the power transistor unit A is turned on by the signal from the engine control unit, primary current
flows to the ignition coil A. When the power transistor unit A is turned off, the
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
transistor unit B is turned off, the ignition plugs of No. 2 and No. 3
cylinders spark.
l
When the engine control unit turns off the transistor in the unit, the battery voltage in the unit is applied to
the power transistor unit to turn it on. When the engine control unit turns on the transistor in the unit, the
power transistor unit is turned off.
TSB Revision
Summary of Contents for 3000GT 1991
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Page 604: ...27 8 REAR AXLE AWD Special Tools SPECIAL TOOLS MZ DA MB990799 01 TSB Revision...
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Page 876: ...42 4 BODY SDecial Tools SPECIAL TOOLS M42DA remover TSB Revision...
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Page 942: ...EXTERIOR SDecial Tools SPECIAL TOOLS MBlKG I system inspectlon MB991 359 TSB Revision...
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