FUEL SYSTEM <4D5-step
III
> -
Troubleshooting
13-36
INSPECTION PROCEDURE 16
Abnormal black smoke
Probable cause
Probable causes can be found in troubles with control system, injection pump,
fuel system, intake system, and EGR system.
D
Control system inoperative
D
Injection pump inoperative
D
Fuel system inoperative
D
Intake system inoperative
D
EGR 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
Air cleaner
D
Injection nozzle
D
Throttle body assembly
D
EGR system
D
Turbocharger
D
Injection pump
INSPECTION PROCEDURE 17
Abnormal white smoke
Probable cause
Probable causes can be found in troubles with control system, injection pump,
fuel system, intake system, EGR system, and glow system.
D
Control system inoperative
D
Injection pump inoperative
D
Fuel system inoperative
D
Intake system inoperative
D
EGR system inoperative
D
Glow 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
Glow plug, glow plug relay
D
Injection nozzle
D
Throttle body assembly
D
EGR system
D
Turbocharger
D
Injection pump
INSPECTION PROCEDURE 18
Hunting during driving
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 nozzle
D
Injection pump