FUEL SYSTEM <DOHC>
IGNITION COIL AND IGNITION POWER TRANSISTOR
models>
Harness side
connector
Harness side
connector
coil
,
,
Engine control module connector
Ignition
No 2
No 4 No 1
adjustment
01
OPERATION
l
W h e n i g n i t i o n p o w e r t r a n s i s t o r u n i t A i s
switched ON by signals from the engine control
module, primary current flows to ignition coil A.
W h e n i g n i t i o n p o w e r t r a n s i s t o r u n i t A i s
switched OFF, the primary current is inter-
rupted, high voltage is generated at secondary
coil A, and the spark plug for the
and
cylinders sparks. When, however, ignition
power transistor unit is switched from ON to
OFF, the spark plug for the
and
cylin-
ders sparks.
l
When the engine control module switches OFF
the power transistor inside the unit, battery vol-
tage is applied to the ignition power transistor
unit, and the ignition power transistor unit is
switched ON.
When the engine switches ON the ignition
power transistor within the unit, however, the
ignition power transistor unit is switched OFF.
TSB Revision
Summary of Contents for 1989 Galant
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