FUEL SYSTEM <4D5-step
III
> -
Troubleshooting
13-33
INSPECTION PROCEDURE 7
Starting performance is bad regardless of whether the
engine is hot or cold (unable to start)
Probable cause
Probable causes can be found in troubles with control system, injection pump,
fuel system, and intake system.
D
Control system inoperative
D
Injection pump inoperative
D
Fuel system inoperative
D
Intake system inoperative
D
Engine-ECU inoperative
NG
Repair
MUT-
II
Self-Diag code
Is a diagnosis code output?
YES
Inspection chart for diagnosis codes (Refer to P.13-9.)
NO
Conduct MUT-
II
Data list check and an actuator test.
(Refer to P.13-42, 46.)
OK
Inspect the following items in order:
D
Injection nozzle, fuel filter
D
Throttle body assembly
D
Compression pressure
D
Injection pump
D
Existence of mixing foreign objects (water, kerosene) with
the fuel
INSPECTION PROCEDURE 8
Low idling speed when the engine is cold (improper
idling speed)
Probable cause
Probable causes can be found in troubles with control system, injection pump,
and fuel system.
D
Control system inoperative
D
Injection pump inoperative
D
Fuel system inoperative
D
Engine-ECU inoperative
NG
Repair
MUT-
II
Self-Diag code
Is a diagnosis code output?
YES
Inspection chart for diagnosis codes (Refer to P.13-9.)
NO
Conduct MUT-
II
Data list check and an actuator test.
(Refer to P.13-42, 46.)
OK
Inspect the following items in order:
D
Injection pump
D
Fuel filter
INSPECTION PROCEDURE 9
High idling speed (improper idling speed)
Probable cause
Probable causes can be found in troubles with control system and injection
pump.
D
Control system inoperative
D
Injection pump inoperative
D
Engine-ECU inoperative
NG
Repair
MUT-
II
Self-Diag code
Is a diagnosis code output?
YES
Inspection chart for diagnosis codes (Refer to P.13-9.)
NO
Conduct MUT-
II
Data list check and an actuator test.
(Refer to P.13-42, 46.)
OK
Inspect the following items in order:
D
Injection pump
D
Starter switch signal