Hino 238, Workshop Manual

Page: 340 / 919

ENGINE CONTROL SYSTEM (J08E) 4–1117
P242B: Exhaust gas temperature sensor (DOC inlet) - rationality
INFORMATION [While Driving]
1. Technical description
•
The exhaust gas temperature is constantly detected by the exhaust gas temperature sensor (DOC inlet).
• The value of the exhaust gas temperature sensor (DOC inlet) is used to control DPR regeneration.
<Description of malfunction>
•
The exhaust gas temperature cannot be correctly recognized.
2. DTC set condition
(1) DTC detection condition
• At least 10 seconds has elapsed since engine was started.
•
Cumulative exhaust gas flow amount
≥
3 kg.
•
Cumulative exhaust gas flow amount of non-operating burner
≥
50 kg.
After the above:
•
Battery voltage is in the range of 10 V to 16 V.
• Engine speed
≥
500 r/min for at least 5 seconds
•
Engine speed
≥
1750 r/min
• Fuel injection amount
≥
15 mm
3
/st
•
Exhaust gas flow rate
≥
500 kg/h
• Difference between engine coolant temperature and intake temperature is more than

8

C {

14.4

F}
In addition, the following conditions continue for at least 10 seconds:
•
Engine speed variation is within

78 r/min.
•
Fuel injection rate variation is within

78 mm
3
/st.
• Vehicle speed
≥
18.8 mile/h
•
No other DTC is detected.
(2) Judgement criteria
Exhaust gas temperature
sensor (DOC inlet)
Differential pressure
sensor
KSL
(VOUT)
(GND)
(VCC)
LCT
10mA
KSF
LCT
KSF
Engine
ECU
LCT
(ADG9)
LCY
(TEX3)
(GND3)
LCZ
LCG
LCY
LCG
LCY
KR4
(ET2+)
SAPH16F010300854