P14Bc: Egr Valve Controller Temperature Sensor 2 (Signal Too Low); Dtc: P14Bc And P14Bd - Hino Motors HINO 155 series Workshop Manual

2–800

DTC: P14BC and P14BD

P14BC: EGR valve controller temperature sensor 2 (Signal too low)

(EGR actuator temp. sensor 2 signal too low)
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 "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 temperature of temperature sensor 2 (CPU side) inside actuator is -50 C {-58 F} or less, and this con-
dition continues for 2 second.
3. Reset condition
• Normal operation is restored and accelerator is not being operated.
ENGINE (J05E)/TROUBLESHOOTING
Engine ECU
VNT EGR
controller actuator
Resistor
Actuator power
relay
Y2E Y4J Z90
NAT X36 $4
EN01H02127030602016134
SHTS021270300723