ENGINE (J05E)/TROUBLESHOOTING
2–469
INSPECTION PROCEDURE: P0401
1.
Check the air cleaner element for dirt, clogging, or damage.
2.
Make sure the element is a Hino genuine part.
NO
YES
1.
Check the installation of the air flow sensor.
2.
Make sure there is no dirt, damage or clogging in the sensing unit
of the air flow sensor.
NO
YES
1.
Check the installation of the boost pressure sensor.
2.
Make sure there is no dirt, damage or clogging in the sensing unit
of the boost pressure sensor.
NO
YES
1
Inspect the air cleaner element
Was any failure found?
Clean or replace the air cleaner element.
Perform "After-inspection work" of INFOR-
MATION section.
Go to step 2.
2
Inspect the air flow sensor
Was any failure found?
Clean the sensing unit and install it properly.
If damaged, replace the air flow sensor.
Perform "After-inspection work" of INFOR-
MATION section.
Go to step 3.
3
Inspect the boost pressure sensor
Was any failure found?
Clean the sensing unit and install it properly.
If damaged, replace the boost pressure sen-
sor.
Perform "After-inspection work" of INFOR-
MATION section.
Go to step 4.