Dtc: P2209 Nox Sensor (Scr Upstream) - Heater Performance - Hino 238 Workshop Manual

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DTC: P2209

DTC: P2209 NOx sensor (SCR upstream) - Heater performance

INFORMATION
Exhaust gas
temperature
sensor
(SCR inlet)
Engine coolant
temperature
sensor 1
Common rail_
1. Technical description
• The NOx sensors are controlled by the NOx sensor controller.
• The NOx sensor controller is connected to the DCU via the harness for reception and transmission of information.
<Description of malfunction>
• Failure of NOx sensor 1 (SCR upstream) is detected.
2. DTC set condition
(1) DTC detection condition
Starter switch ON.
SCR catalyst downstream temperature (from exhaust gas temperature sensor (SCR inlet)) ≥ 100 C {212 F}
Engine coolant temperature ≥ 65 C {149 F}
(2) Judgement criteria
A valid NOx reading cannot be taken by the NOx sensor when 180 sec. elapses after start of NOx sensor heater acti-
vation.
DEF SCR SYSTEM (DCU)
DCU
L
H
&RF
(CA2H)
CAN_J/C2
&RK
(CA2L)
H L
ECU
%JR
(CA2H)
%JW
(CA2L)
H
L
%JS
(CA2H)
Common rail_
%JX
(CA2L)
CAN_J/C3
LJK %KH
LJM
(CAH1)
(CAH0) (CA3H)
BCU
LJL
LJN %KG
(CAL1) (CAL0) (CA3L)
H L
EN01H16F02040F03001058
FUSE NOx2
A99
(3GLD)
FUSE NOx1
A8V
(6BLD)
NOx
sensor1
LE8
LE9
H (VCC)
(CANH)
LGU
(GND)
LE7
LE8
L
(GND)
(CANL)
LED LEA
H
(CANH) (VCC)
LEC LEB
L
(CANL) (GND)
NOx
sensor2
Common rail_
CAN_J/C1
FR W/H BATT GND CABLE
&1D &99 &99
(G4-A)
A49
(-(1))
BATTERY1
Z29
(G4P)
BATTERY GND
SAPH16F020400212
A48
(+(1))