P0406: Valve Position Sensor Magnet Lost - Hino Motors HINO 155 series Workshop Manual

P0406: Valve position sensor magnet lost (EGR actuator position sensor signal too high)
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 magnetic flux of the position sensor is less than 35kA/m remains for 1 second or more.
3. Reset condition
• After normal status is resumed and accelerator opening is fully closed.
4. Indication, warning or system control regulation when the DTC is set.
• MIL: ON
• SVS light: OFF
• Fuel injection limit
ENGINE (J05E)/TROUBLESHOOTING
Engine ECU
VNT EGR
controller actuator
Resistor
Actuator power
relay
Y2E Y4J Z90
NAT X36 $4
2–501
SHTS021270300465