Hino Motors HINO 155 series Workshop Manual page 436

2–400
2. DTC set condition
(1) DTC detection condition
1. The #1 – #4 injection quantity and timing diagnosis is detecting normally.
2. All the following conditions continue for at least 10 seconds.
• Engine speed is in the range of 725-775 r/min.
• Gear position is D range.
• Fuel injection quantity < 45 mm
• Engine coolant temperature ≥ 71 C {159.8 F}.
• Throttle opening is 0%.
• Vehicle speed is 0 mph.
• Barometric pressure ≥ 75 kPa.
• Exhaust brake and PTO are not in operation.
(2) Judgement criteria
• If the speed of all of cylinders from #1 – #4 measured by the engine speed main sensor is low, the status
where the fuel injection quantity decreases by 30 to 45 mm
• If the speed of all of cylinders from #1 – #4 measured by the engine speed main sensor is low, the status
where the fuel injection quantity decreases by 10 to 20 mm
3. Reset condition
• After restoration to normal condition.
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>
• Large vibration during idling.
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.
8. Estimated failure factors
• Fuel injection line: break, crack, fuel leak
• Cylinder: compression leak
• Injector: clogging, constantly injecting
• Use of low-grade fuel
• Crankshaft position sensor phase shifting.
ENGINE (J05E)/TROUBLESHOOTING
3
/st. cyl.
3
/st. cyl or more continues for 20 seconds or more.
3
/st. cyl or more remains for 20 seconds or more.