P1459: Controller High Temperature; Dtc: P1459 - Hino Motors HINO 155 series Workshop Manual

DTC: P1459

P1459: Controller high temperature (EGR actuator over temp severe level)
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
• Battery voltage is in the range of 10 V to 16 V.
• The engine stopped, or the engine speed remains at 500 r/min or more for 5 seconds or more.
• Starter key "ON".
(2) Judgement criteria
• Actual actuator temperature is 165 C {329 F}, and this condition continues for 1.6 sec.
3. Reset condition
• Normal operation is restored and accelerator is not being operated.
4. Indication, warning or system control regulation when the DTC is set.
• MIL: ON
• SVS light: ON
• Engine output is restricted.
ENGINE (J05E)/TROUBLESHOOTING
Engine ECU
VNT EGR
controller actuator
Resistor
Actuator power
relay
Y2E Y4J Z90
NAT X36 $4
2–775
EN01H02127030602016129
SHTS021270300701