Hino Motors HINO 155 series Workshop Manual page 534

2–498
5
Check the response delay of the EGR valve
(2)
Do the measurements meet the standard value?
Replace the engine ECU.
Perform "After-inspection work" of INFOR-
MATION section.
ENGINE (J05E)/TROUBLESHOOTING
1. Select [Inspection Menu] and check the time lag (following charac-
teristics) of the target EGR valve opening and actual EGR valve
(1)
opening.
(3)
! CAUTION
Perform the inspection while the engine is stopped to avoid
(4)
engine damages.
(5)
<Inspection procedure>
(1) Select [Inspection Menu].
(2) Select [EGR inspection].
(3) Select [Start inspection].
(4) Select [EGR opening UP]:
SHTS021270300463
• Check each step from 0% – 90% of the time lag (following character-
istics) of the target EGR valve opening and actual EGR valve open-
ing.
(5) Select [EGR opening DOWN]:
• Check each step from 90% – 0% of the time lag (following character-
istics) of the target EGR valve opening and actual EGR valve open-
ing.
HINT
In EGR openings from 0% – 90%, 1 step corresponds to a 10%
change.
The response delay should be less than 5 seconds.
YES
Standard values
NO
Replace the EGR valve.
Perform "After-inspection work" of INFOR-
MATION section.