1H-1 Ignition System:
Power Head
Ignition System
General Description
Ignition System Description
Z9J0111801001
The ignition system used by the DF70 / 80 / 90 is a fully transistorized, electronic microcomputer timing advanced
type.
This system is battery powered, with the ECM controlling all of the ignition timing functions.
The ignition system is composed of the ignition coil, spark plug and components for system control (ECM, sensor,
switch etc.).
When the ignition switch is “ON”, battery voltage (12 V) is applied to the circuit as shown in the illustration.
The ECM determines the optimum ignition timing and duration of current flowing through the ignition coil primary
winding based on the signals received from various sensors. The ECM interrupts the base current of the power
transistor inside the ignition coil thereby controlling current flow (ignition) to the primary winding of the ignition coil.
In this way, a mutual induction high voltage occurs in the ignition coil secondary side and spark is generated.
ECM
IGT2
54
IGT3
41
IGT4
53
Spark
plug
Spark
plug
Spark
plug
Spark
plug
IGT1
42
Bl
O
Gr/Y
Lg/R
12
35
36
15
Sensor / switch signal
OFF
IG
Ign.1
Ign.2
Ign.3
Ign.4
5
1
2
4
3
I9J011180001-05
1. Main relay 3. Battery 5. Fuse 15 A
2. Ignition switch 4. Fuse 30 A
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