3-45 ENGINE CONTROL SYSTEM
CHART11 : 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.
• 15A fuse is good.
START
< Ignition switch “ON” >
Check “B5” terminal
voltage.
Is result OK?
(See page 3-34.)
< Cranking >
Check injector operating
sound.
Is result OK?
(See page 3-36.)
NO
< Ignition switch “OFF” >
Check fuel injector
resistance.
Is result OK?
(See page 3-35.)
YES
< Ignition switch “ON” >
Check “A7, A8 and A4
terminal voltage.
Is result OK?
(See page 3-34.)
YES
< Cranking >
Check fuel injector
operating signal.
Is result OK?
(See page 3-36.)
YES
Fuel injector failure
< Ignition switch “ON” >
Check “B1” terminal
voltage for 3 sec. after
switch ON.
Is result OK?
(See page 3-34.)
Possible cause :
Failure of high pressure
fuel system components.
(See page 3-46.)
NO
ECM main relay failure
YES
< Ignition switch “ON” >
Check “C1” terminal
voltage
Is result OK?
(See page 3-34.)
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 3-35.)
• Check ignition secondary
coil resistance.
(See page 3-35.)
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 3-37.)
YES
< Cranking >
Check “B1” terminal
voltage.
Is result OK?
(See page 3-34.)
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 “A1, A3 and A5”
terminal voltage.
Is result OK?
(See page 3-34.)
YES
< Cranking >
Check ignition coil operat-
ing signal.
Is result OK?
(See page 3-37.)
< Cranking >
Check “D11” terminal
voltage.
Is result OK?
(See page 3-34.)
NO
Engine start signal wire
(Y/G) failure
NO
NO
NO
YES
YES
NO
YES
NO
YES
NO
YES
NO
NO
YES
NO
YES
NO
To Next Page
Loading...
