DEF SCR SYSTEM (DCU)
5–304
INSPECTION PROCEDURE: P2204
1.
Set the starter switch to the "LOCK" position.
2.
Connect the vehicle to Hino-DX.
3.
Set the starter switch to the "ON" position.
4.
Select [DCU] and check if any DTC other than P2204 (for example,
P2202, P2203, P2209, U029D) has been detected in [Fault Infor-
mation].
NO
YES
1.
Set the starter switch to the "LOCK" position.
2.
Disconnect the NOx sensor 1 (SCR upstream) and NOx sensor 2
(SCR downstream).
3.
Install NOx sensors 1 and 2 in the vehicle, in their opposite loca-
tion.
4.
Set the starter switch to the "ON" position.
5.
Erase the malfunction history using Hino-DX.
6.
Perform the DPR forced regeneration.
7.
Select [DCU] and check if P2204 has been detected in [Fault Infor-
mation].
NO
YES
1
Check the DTC detected (DCU) [Hino-DX]
Select
DCU
SAPH16F020400206
Has a DTC other than P2204 been detected?
Go to diagnosis procedure of a related DTC.
Go to step 2.
2
Inspect the NOx sensor 1 (SCR upstream) [Hino-DX]
Select
DCU
SAPH16F020400207
Has DTC P2204 been detected?
Go to step 3.
Replace the NOx sensor 1 (SCR upstream).
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 ...
