Suzuki DF 90 - Page 97

ENGINE CONTROL SYSTEM 3-49
CHART12 : ENGINE CRANKED, BUT NOT START (OR STOPS SHORTLY
AFTER STARTING)
Before starting this troubleshooting, make sure that :
• There is no self-diagnostic code indication.
• Emergency stop switch plate is set in place.
START
< Ignition switch “ON” >
Check “30” terminal
voltage.
Is result OK?
(See page 3-37)
< Cranking >
Check injector operating
sound.
Is result OK?
(See page 3-39)
NO
< Ignition switch “OFF” >
Check fuel injector
resistance.
Is result OK?
(See page 3-38)
YES
< Ignition switch “ON” >
Check “22, 38, 39 and 40
terminal voltage.
Is result OK?
(See page 3-37)
YES
< Cranking >
Check fuel injector
operating signal.
Is result OK?
(See page 3-40)
YES
Fuel injector failure
< Ignition switch “ON” >
Check “37” terminal
voltage for 3 sec. after
switch ON.
Is result OK?
(See page 3-37)
Possible cause :
Failure of high pressure
fuel system components.
(See page 3-50)
NO
ECM main relay failure
YES
< Ignition switch “ON” >
Check “2” terminal voltage.
Is result OK?
(See page 3-37)
YES
YES
< Cranking >
Check ignition spark using
timing light.
(P/no. 09930-76420)
Is there light flashing?
< Ignition switch “OFF” >
• Check ignition primary
coil resistance.
(See page 3-38)
• Check ignition secondary
coil resistance.
(See page 3-42)
Are results OK?
Power supply wire (Gr)
failure
ECM failure
Fuel pump failure
NO
< Ignition switch “ON” >
Check fuel pump 3 sec.
operating sound.
Is result OK?
(See page 3-39)
YES
< Cranking >
Check “37” terminal
voltage.
Is result OK?
(See page 3-37)
Emergency stop switch
failure
Spark plug failure
< Individual check >
Check if spark plug is in
good condition.
Is result OK?
NO
Ignition coil failure
< Ignition switch “ON” >
Check “43 and 44” termi-
nal voltage.
Is result OK?
(See page 3-37)
YES
< Cranking >
Check ignition coil operat-
ing signal.
Is result OK?
(See page 3-41)
NO
NO
NO
YES
YES
NO
NO
YES
NO
YES
NO
NO
YES
NO
YES
NO