Repair Section
2
–
119
(12) Black Smoke
Clogged air cleaner element
Description
Black smoke is being exhausted.
Possible Cause
• Injector
• Supply pump
• EGR system
• Engine ECU
• Electronic control throttle
• Rail pressure sensor
• Mass Air Flow (MAF) meter
• Boost pressure sensor
1 Check for air cleaner clogging and/or damage. Replace the air cleaner or repair the air duct.
2 Check the electronic control throttle and the cor-
responding circuit. (Refer to the electronic con-
trol throttle check procedure issued by the
vehicle manufacturer.)
Repair or replace the electronic control throttle
and/or the corresponding circuit.
3 Check the MAF meter and the corresponding
circuit. (Refer to the MAF meter check proce-
dure issued by the vehicle manufacturer.)
Repair or replace the MAF meter and/or the cor-
responding circuit.
4 Check the Exhaust Gas Recirculation (EGR)
system. (Refer to the EGR system check proce-
dure issued by the vehicle manufacturer.)
Repair or replace the EGR system.
5 Check the boost pressure sensor and the corre-
sponding circuit. (Refer to the boost pressure
sensor check procedure issued by the vehicle
manufacturer.)
Repair or replace the boost pressure sensor
and/or the corresponding circuit.
6 Check the rail pressure sensor and the corre-
sponding circuit. (Refer to the rail pressure sen-
sor check procedure issued by the vehicle
manufacturer.)
Repair or replace the rail pressure sensor and
the corresponding circuit.
NG
OK
NG
OK
NG
OK
NG
OK
NG
OK
NG
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