Hino Motors HINO 155 series Workshop Manual page 520

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2. DTC set condition
(1) DTC detection condition
The following conditions continue for at least 30 seconds.
• Starter key "ON".
• DPR auto-regeneration is inactive.
• Engine coolant temperature is 30 C {86 F} or less.
• Engine speed of 1,000 r/min or less.
• Exhaust brake is not actuated.
Otherwise, the following conditions continue for at least 30 seconds.
• Starter key "ON".
• Engine coolant temperature is 55 C {131 F} or more.
• Engine speed of 750 r/min or less.
• Fuel injection rate 80 mm
• Exhaust brake is not actuated.
• EGR valve opening is 0 %.
(2) Judgement criteria
• When EGR feedback (value of theoretical EGR rate - actual EGR rate) stays above the threshold value for at
least 30 seconds.
• Above criterion is determined from the boost pressure, intake manifold temperature, air intake quantity, fuel
injection rate, and engine speed.
3. Reset condition
• After normal operation is restored and the starter key is turned "LOCK".
4. Indication, warning or system control regulation when the DTC is set.
• MIL: ON
• SVS light: OFF
• Engine output is restricted.
5. Symptoms on the vehicle when the DTC is set
<Symptoms on the vehicle due to backup control (fail safe function)>
• Engine output is insufficient.
• EGR valve is fully closed.
<Symptoms on the vehicle due to malfunction>
• Faulty engine revving (engine hesitation)
• Insufficient output or engine stall because of DPF clogging due to faulty catalyst regeneration
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
3
/st. cyl.