Suzuki DF150 Service Manual page 137

3-78 ENGINE CONTROL SYSTEM
CHART 19: ENGINE CRANKED, BUT NOT START
(OR STOPS SHORTLY AFTER STARTING)
Before starting the troubleshooting, make sure that:
• There is no self-diagnostic code indication.
• Emergency stop switch plate is set in place.
START
<Ignition switch "ON">
Check "23" terminal voltage.
Is result OK? (See page 3-48.)
YES
<Ignition switch "ON">
Check "20" terminal voltage.
Is result OK? (See page 3-48.)
YES
<Ignition switch "OFF">
Check fuel injector resistance.
(See page 3-51 .)
Is result OK?
YES
<Ignition switch "ON">
Check "54, 36, 28, 53" terminal
voltage. (See page 3-48.)
Is result OK?
YES
<Cranking >
Check fuel injector operating
signal. (See page 3-54.)
Is result OK?
<Ignition switch "ON">
Check high pressure fuel pump
6 sec. operating sound.
(See page 3-53.) Is result OK?
• Ignition switch failure
NO
• Wire continuity/connection
NO
ECM main relay failure
YES
<Cranking>
YES
Check ignition spark using
timing light (P/no. 09930-
76420).
Is there light flashing?
<Cranking>
Check ignition coil operating
signal. (See page 3-55.)
Is result OK?
NO
• ECM failure
NO
• Wire continuity/connection
YES
Fuel injector failure
<Ignition switch "ON">
NO
Check "52" terminal voltage.
(See page 3-48.) Is result OK?
• High pressure fuel pump failure
• Wire continuity/connection failure
failure
NO
failure
YES
Spark plug failure
NO
<Individual check>
NO
Check if spark plug
is in good condition.
Is result OK?
YES
Check ignition coil
YES
condition.
(See page 3-56.)
Is result OK?
YES
NO
Ignition coil failure
NO
• ECM failure