DEF SCR SYSTEM (DCU)
5–236
1.
Set the starter switch to the "ON" position.
2.
Select [DCU] from the menu.
3.
Select [Coolant shutoff valve] from the [Activation Test] menu and
check the coolant cut off valve (DEF tank heater valve) operating
noise.
NO
YES
1.
Select [DEF tank temperature] and [Engine coolant temperature]
from [Data Monitor].
2.
Start the engine.
3.
Check if the DEF tank temperature rises when the coolant temper-
ature is 40
C {104
F} or higher.
NO
YES
8
Coolant cut off valve (DEF tank heater valve) actuation test [Hino-DX]
Select
DCU
SAPH16F020400157
Operating noise is heard?
Go to step 9.
Replace the coolant cut off valve (DEF tank
heater valve).
Perform "After-inspection work" of INFOR-
MATION section.
9
Inspect the engine coolant temperature [Hino-DX]
Select
DCU
SAPH16F020400158
Did DEF tank temperature rise?
Go to step 10.
Replace the coolant cut off valve (DEF tank
heater valve).
Perform "After-inspection work" of INFOR-
MATION section.
Summary of Contents for 238
Page 201: ...ENGINE CONTROL SYSTEM J08E 4 978 Harness disconnection or short circuit ...
Page 215: ...ENGINE CONTROL SYSTEM J08E 4 992 Malfunction of sensor 2 Malfunction of engine ECU ...
Page 301: ...ENGINE CONTROL SYSTEM J08E 4 1078 8 Estimated failure factors Malfunction of engine ECU ...
Page 709: ...DEF SCR SYSTEM DCU 5 143 8 Estimated failure factors DEF pump pressure sensor malfunction ...
