Hino 238, Руководство по ремонту, Страница: 776 / 919

DEF SCR SYSTEM (DCU) 5–210
1. Disconnect the breather hose and check if it is not clogged, punc-
tured, or cracked.
NO YES
1. Start the engine and idle it for 10 minutes while you check if the
DEF pressure is maintained around 900 kPa {131 psi} in [Data
Monitor] (800 kPa
–
1,050 kPa) {(116 psi
–
152 psi)}.
2. Set the starter switch to the "LOCK" position.
3. Check if the DCU main relay is OFF in the Hino-DX menu. (This
cuts off the communication between Hino-DX and the DCU.)
4. Select [DCU] and check if P20A1 is detected in [Fault Information].
NO YES
3
Inspect the DEF tank
Was any failure found?
Replace the breather hose.
Perform "After-inspection work" of INFOR-
MATION section. Go to step 4.
4
Check the DTC detected (DCU) [Hino-DX]
Select
DCU
When communicat-
ion with the DCU is
interrupted while
the DCU is connec-
ted to the Hino-DX,
the connection
symbol at the left
bottom of the Hino-
DX screen (figure
on the left) becom-
es disconnected.
SAPH16F020400138
Has DTC P20A1 been detected?
Replace the DCU.
Perform "After-inspection work" of INFOR-
MATION section. Procedure completed.
Perform "After-inspection work" of INFOR-
MATION section.