Hino 238, Workshop Manual, Page: 370 / 919

ENGINE CONTROL SYSTEM (J08E) 4–1147
NO YES
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
Standard values
From the Target EGR position to the Actual EGR position, the
response delay should be within 5 seconds.
Are the measurements within standard value?
Go to step 16. Replace the EGR valve.
Perform "After-inspection work" of INFOR-
MATION section.
16
Check the response delay of the VNT controller
(4)
(5)
(3)
(1)
(2)
SAPH16F010300881
Standard values
The response delay should be less than 3 seconds.
Do the measurements meet the standard value
？
Go to step 17. Replace the turbocharger.
Perform "After-inspection work" of INFOR-
MATION section.