DEF SCR SYSTEM (DCU)
5–96
NO
YES
1.
Connect the vehicle to Hino-DX.
2.
Set the starter switch to the "ON" position.
3.
Select [DCU] from the menu.
4.
Select [Coolant shutoff valve] from the [Activation Test] menu and
operate the coolant shutoff valve.
(1) When the valve is open: Check if the pressure inside the
downstream coolant line is rising by feeling the line with your
hand.
(2) When the valve is closed: Check if the pressure inside the
downstream coolant line is dropping by feeling the line with
your hand.
! CAUTION
•
Be careful not to burn yourself when the coolant is hot.
NO
YES
1.
Make sure there are no leaks in the engine cooling system (lines
and hoses).
2.
Check the engine cooling system (lines and hoses) and check if
there are no disconnections, clogging, punctures, or cracks.
Go to step 14.
Replace the engine coolant temperature sen-
sor.
Perform "After-inspection work" of INFOR-
MATION section.
14
Check the operation of the coolant shutoff valve [Hino-DX]
Select
DCU
SAPH16F020400069
Is operation normal?
Go to step 15.
Replace the coolant shutoff valve.
Perform "After-inspection work" of INFOR-
MATION section.
15
Inspect the engine coolant lines & hoses
Was any failure found?
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 ...
