Dtc: P2203 Nox Sensor (Scr Upstream) And Heater - Circuit (Circuit Short) - Hino 238 Workshop Manual

5–298
DTC: P2203

DTC: P2203 NOx sensor (SCR upstream) and Heater - Circuit (Circuit short)

INFORMATION
H
Common rail_
CAN_J/C2
H
1. Technical description
• NOx sensor 1 (SCR upstream) is controlled by the NOx sensor controller.
• The NOx sensor controller is connected via the engine ECU and DCU through CAN communication, and it sends and
receives data.
<Description of malfunction>
• Failure of NOx sensor 1 (SCR upstream) is received from CAN data.
2. DTC set condition
(1) DTC detection condition
Starter switch ON.
(2) Judgement criteria
Failure of NOx sensor 1 (SCR upstream) internal circuit (High failure flag) is received from CAN data.
DEF SCR SYSTEM (DCU)
DCU
Common rail_
CAN_J/C3
L
LJK
&RF LJM
(CA2H)
(CAH1)
(CAH0)
BCU
LJL
&RK LJN
(CAL1)
(CA2L) (CAL0)
L
H L
ECU
%JR
(CA2H) (CANH)
%JW
(CA2L) (CANL)
H L
%JS LED
(CA2H) (CANH)
%JX LEC
(CA2L) (CANL)
%KH
Common rail_
(CA3H)
CAN_J/C1
%KG
(CA3L)
EN01H16F02040F03001056
FUSE NOx2
A99
(3GLD)
FUSE NOx1
A8V
(6BLD)
NOx
sensor 1
LE9 LE6
H (VCC)
LGU
(GND)
LE7
LE8
L
(GND)
LEA
H
(VCC)
LEB
L
(GND)
NOx
sensor 2
FR W/H BATT GND CABLE
&1D &99 &99
A48
(G4-A)
A49
(-(1))
(+(1))
BATTERY1
Z29
(G4P)
BATTERY GND
SAPH16F020400203