Industrial 1.6L Engine Electrical 3-43
IGNITION SYSTEM DESCRIPTION
The 1.6 Liter, 4-cylinder engine, is equipped with a
distributorless ignition system (DIS). The electronic
control unit (ECU) performs all of the ignition control
functions based on signals from the crankshaft
position sensor.
The ignition system consists of a battery, the DIS
ignition module containing two coil packs, a crankshaft
position sensor, an ignition switch, the spark plugs, and
the primary and secondary ignition wiring.
Ignition Switch
The ignition switch mounting location is determined by
the customer. The switch has three terminals. The “B”
(battery) terminal is connected directly to the battery
and is “hot” at all times. The “I” (ignition) terminal is
“hot” when the switch is in the RUN or START posi-
tions. This terminal provides current to the ignition
system and the engine electrical components such as
the generator field circuit. The “S” terminal is “hot” in
START only. It provides current to energize the starter
solenoid, allowing the starter motor to operate.
DIS Ignition Module
The DIS ignition module contains two ignition coil
packs and is mounted at the rear of the camshaft
housing. It is powered by an ignition feed or primary
circuit. Battery voltage is available at the primary
ignition terminal “D” of the module anytime the ignition
switch is in the RUN or START position and terminal
“C” provides a dedicated ground.
The secondary circuit is connected to the module and
spark plugs by a high tension wires.
The DIS ignition module is controlled by pulses pro-
vided by the ECU. The ECU causes a spark to occur
by pulsing an IC circuit, which triggers an ignition coil
and fires the appropriate spark plug.
One ignition coil pack fires cylinders 1 and 4 while the
other coil pack fires cylinders 2 and 3.
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