P06D4: Air Flow Sensor Power Supply Failure (High) - Hino Motors HINO 155 series Workshop Manual

P06D4: Air flow sensor power supply failure (High)

INFORMATION
Body earth
1. Technical description
• The air flow sensor installed to the air cleaner consistently measures an intake air volume.
• The engine ECU supplies power to the air flow sensor.
<Description of malfunction>
• Excessively low voltage has been detected in the air flow sensor power supply.
2. DTC set condition
(1) DTC detection condition
• Key is ON and starter is OFF.
• Battery voltage is in the range of 10 V to 16 V.
The conditions described above remain for 5 seconds or longer.
(2) Judgement criteria
Voltage of air flow sensor power supply circuit ≥ 20 V for 1 second.
3. Reset condition
• Normal operation instantly restored once values deviate from judgment criteria.
4. Indication, warning or system control regulation when the DTC is set.
• MIL: OFF
• 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 detected after test drive.
ENGINE (J05E)/TROUBLESHOOTING
Coolant temperature
sensor
(THW)
X66
Z5G (E)
X71
(FC)
XCV
(E2G)
XCT
(+B)
Z65
(E2)
X72
(THA)
Intake air temperature sensor
(built in the air flow sensor)
Engine ECU
10mA X28 (THW)
10mA
ZJQ (E5)
10mA X4K
(VG)
200mA XMH
(EVG)
200mA X2U
(VAF)
10mA
X82
10mA
(THA)
2–709
SHTS021270300647