Hino 238, Workshop Manual

Page: 329 / 919

ENGINE CONTROL SYSTEM (J08E) 4–1106
1. Select [Check functions]_[VNT check] from the menu, and inspect
the response delay at the Target VNT position and Actual VNT
position.
! CAUTION
•
Perform the inspection while the engine is stopped to avoid
engine damages.
<Inspection procedure>
(1) Select [Check functions].
(2) Select [VNT check].
(3) Click [Check start].
(4) Click [VNT opening UP].
•
Inspect the response delay at each step of the Target VNT posi-
tion and Actual VNT position from 0 to 90 %.
(5) Click [VNT opening DOWN].
•
Inspect the response delay at each step of the Target VNT posi-
tion and Actual VNT position from 90 to 0 %.
HINT
•
The VNT opening position changes of 10 % per step between
0
–
90 %.
NO YES
1. Check there is no dirt, damage or clogging in the air cleaner ele-
ment.
2. Make sure the element is a Hino genuine part.
NO YES
2
Check the response delay of the VNT controller [Hino-DX]
(4)
(5)
(3)
(1)
(2)
SAPH16F010300849
Standard values
The response delay should be less than 3 seconds.
Do the measurements meet the standard value?
Go to step 3. Replace the turbocharger.
Perform "After-inspection work" of INFOR-
MATION section.
3 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 4.