Dtc: P0489 And P0490; P0489: Egr Valve Controller Motor (Open Circuit) - Hino Motors HINO 155 series Workshop Manual

2–534

DTC: P0489 and P0490

P0489: EGR valve controller motor (open circuit) (EGR actuator motor open circuit)
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}).
• DTC is issued when failure message is received from EGR actuator unit.
<Description of malfunction>
• EGR actuator system is malfunctioning.
2. DTC set condition
(1) DTC detection condition
• Starter key is turned "ON".
• Battery voltage is in the range of 10 V 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.
• The condition that the actual current applied to the motor built-in the EGR actuator is 0.6 A or less remains for
2 seconds or more.
3. Reset condition
• After normal status is resumed and the starter key is turned "LOCK".
ENGINE (J05E)/TROUBLESHOOTING
Engine ECU
VNT EGR
controller actuator
Resistor
Actuator power
relay
Y2E Y4J Z90
NAT X36 $4
EN01H02127030602016083
SHTS021270300491