Dodge Stealth 1994 - Page 253

ENGINE ELECTRICAL - Ignition System
8-251
OPERATION
<SOHC>
0
L.
0
0
Turn ignition switch to “ON” position, and
battery voltage will be applied to primary wind-
ing of ignition coil.
When crankshaft position sensor and camshaft
position sensor signal is input to engine control
module, ON-OFF control of power transistor is
performed by engine control module.
When power transistor is turned on, current
flows from ignition coil (primary winding) to
ground through power transistor.
When power transistor is turned off, high
voltage is generated in primary winding of
ignition coil which induces even higher voltage
in the secondary winding, causing a spark at the
spark plug(s).
<DOHC>
l When crankshaft position sensor and camshaft
position sensor signal is input to engine control
module, engine control module makes ON-OFF
control of power transistors one by one.
l When power transistor A is turned from ON to
OFF, the spark plugs of No. 1 and No. 4 cylinders
spark. Turning of power transistor B from ON to
OFF will produce sparking in spark plugs of No. 2
and No. 5 cylinders. Furthermore, when power
transistor C is turned from ON to OFF, sparking
is produced in spark plugs of No. 5 and No. 6
L
cylinders.
l The rest of operation is the same as described
for SOHC engine.
TROUBLESHOOTING HINTS
1. Engine cranks, but does not start.
(1) Spark is insufficient or does not occur at all
(on spark plug).
l Check ignition coil.
l Check distributor. <SOHC Engine>
l Check crankshaft position sensor and
camshaft position
sensor
<DOHC
Engine>
l Check power transistor.
l Check spark plugs.
l Check spark plug cable.
(2) Spark is good.
l Check ignition timing.
2. Engine idles roughly or stalls.
l Check spark plugs.
l Check ignition timing.
l Check ignition coil.
l Check spark plug cable.
3. Poor acceleration
l Check ignition timing.
l Check spark plug cable.
l Check ignition coil.