P049D: Position Failure (Egr Actuator Wiping Fault); Dtc: P049D - Hino Motors HINO 155 series Workshop Manual

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DTC: P049D

P049D: Position failure (EGR actuator wiping fault)

INFORMATION
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 engine coolant temperature is low (≤ 40 C {104 F})
• Wiping operation from "fully open  fully closed" is conducted as an EGR valve surface cleaning operation when
the key is LOCK.
<Description of malfunction>
• Failure message is received from EGR controller.
2. DTC set condition
(1) DTC detection condition
• The starter key is "ON".
• The battery voltage is in the range of 10 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
• When wiping (valve opens and closes with key LOCK) results in valve moving 10 beyond the learned value in
the closing direction for more than 1 seconds.
3. Reset condition
• After normal status is resumed and accelerator opening is fully closed.
ENGINE (J05E)/TROUBLESHOOTING
Engine ECU
VNT EGR
controller actuator
Resistor
Actuator power
relay
Y2E Y4J Z90
NAT X36 $4
EN01H02127030602016084
SHTS021270300496