P0123: Intake Throttle Valve Position Sensor 1 - Out Of Range (High) - Hino Motors HINO 155 series Workshop Manual

P0123: Intake throttle valve position sensor 1 - out of range (Out of range high)
INFORMATION
1. Technical description
• The diesel throttle controls valves steplessly to control boost pressure and intake air volume.
• Inside the diesel throttle, a sensor designed to detect a travel of the valve consistently monitors a measurement
reading and an actual opening.
<Description of malfunction>
• High voltage failure of diesel throttle (intake throttle valve) position sensor is detected.
2. DTC set condition
(1) DTC detection condition
• Starter key "ON".
• Battery voltage is in the range of 10 V to 16 V.
• The engine is stopped, or the engine speed remains at 500 r/min or more for 5 seconds or more.
(2) Judgement criteria
• Output of the sensor remains at 4.8 V (120 C {248 F}) or less for 3 seconds or longer.
3. Reset condition
• After normal operation is restored.
4. Indication, warning or system control regulation when the DTC is set.
• MIL: ON
• SVS light: OFF
5. Symptoms on the vehicle when the DTC is set
<Symptoms on the vehicle due to backup control (fail safe function)>
• –
<Symptoms on the vehicle due to malfunction>
• –
6. Pre-inspection work
• Check that the battery voltage is in the normal range.
7. After-inspection work
• Clear all past DTCs.
• Check that no DTC is stored after test drive.
8. Estimated failure factors
• Abnormal resistance of sensor
• Engine ECU internal circuit failure
• Sensor power supply short-circuit in sensor harness
• Sensor internal short
ENGINE (J05E)/TROUBLESHOOTING
XFD
(E2R)
XFC
(VCR)
Z6P
(E2)
Diesel throttle
XSR
(VTA2)
X0N
(VC)
X3U
(VTA)
Engine ECU
TYP 0.2A
XQT (M-)
TYP 1A
XQS
(M+)
TYP 1A ZD6
(E3)
TYP 0.2A X3V
(VTA2)
TYP 0.2A XG2
(VC2)
TYP 0.2A XK3
(VTA1)
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SHTS021270300248