P04Da: Egr Feedback Failure; Dtc: P04Da - Hino Motors HINO 155 series Workshop Manual

DTC: P04DA

P04DA: EGR feedback failure

INFORMATION
Common rail
pressure sensor
Body earth
1. Technical description
• EGR valve is a butterfly type.
• EGR valve opening is controlled by engine speed and amount of intake air.
• EGR valve opening is adjusted by engine ECU and CAN communication.
• EGR valve will not operate when coolant temperature is low (≤ 40 C {104 F}).
• Engine ECU calculates the actual EGR rate based on information from the boost pressure sensor, engine speed
sensor, intake manifold temperature sensor, and air flow sensor.
• Engine ECU compares the actual EGR rate and the theoretical EGR rate stored in the ECU memory.
<Description of malfunction>
• EGR rate may be over-applied.
2. DTC set condition
(1) DTC detection condition
• Starter key "ON".
• DPR auto-regeneration is inactive.
• Engine coolant temperature is 30 C {86 F} or more.
• Engine speed of 500 r/min or more.
• Exhaust brake is not actuated.
• EGR valve opening is more than 0 %.
• Atmospheric pressure is 75 kPa or more.
(2) Judgement criteria
• The threshold value of EGR feedback amount continues for 30 seconds or more.
ENGINE (J05E)/TROUBLESHOOTING
Engine ECU
Boost pressure
sensor
Intake manifold
temperature
temperature sensor
sensor (air flow sensor built in)
VNT
controller
Intake air
EN01H02127030602016086
Resistor
Actuator power
relay
EGR
actuator
Y2E Y4J Z90
NAT X36 $4
SHTS021270300507
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