Nissan Qashqai J11. Manual - part 466
COMPONENT PARTS
EC9-19
< SYSTEM DESCRIPTION >
[R9M]
C
D
E
F
G
H
I
J
K
L
M
A
EC9
N
P
O
High Pressure EGR Volume Control Valve
INFOID:0000000010308935
High pressure EGR Volume Control Valve controls the volume of EGR gas returning from the exhaust mani-
fold to the intake manifold.
The High Pressure EGR Volume Control Valve consists of High Pressure EGR Volume Control Valve Position
Sensor, High Pressure EGR Valve, and DC motor. The High Pressure EGR Volume Control Valve Position
Sensor consists of a permanent magnet and Hall IC, and senses the valve position and feeds the voltage sig-
nals to the ECM. The ECM judges the current opening angle of the valve from this signals, and controls the
DC motor to make the valve opening angle in response to driving conditions.
The valve is controlled by means of double regulation loop.
The first loop, the quicker of the two, is a position loop. It allows the valve to be adjusted to the desired position
by feedback based on the information derived from the sensor position.
The second loop (slower) is a mass air flow loop. The mass air flow set-point is set by reference maps
depending on engine working point, ambient condition corrections (air and coolant liquid temperatures, atmo-
spheric pressure), gear engaged and state of EGR cooler bypass. For a given operating point, the air flow is
obtained by modulating the quantity of exhaust gases passing through the EGR valve and the fresh air flow
passing through the intake flap. When EGR flow is increase, fresh air flow is decrease. The air flow measure-
ment is provided by the mass air flow sensor. The fresh air and EGR flow controller provides the EGR and inlet
throttle position set-points.
Low Pressure EGR Volume Control Valve
INFOID:0000000010308936
Low Pressure EGR Volume Control Valve controls the volume of EGR gas returning from the exhaust tube
(downstream of DPF) to the passage of intake air (upstream of turbocharger).
The Low pressure EGR Volume Control Valve consists of Low pressure EGR Volume Control Valve Position
Sensor, EGR Valve, and DC motor. The EGR Volume Control Valve Position Sensor consists of a permanent
magnet and Hall IC, and senses the valve position and feeds the voltage signals to the ECM. The ECM judges
the current opening angle of the valve from this signals, and controls the DC motor to make the valve opening
angle in response to driving conditions.
Low Pressure EGR Temperature Sensor
INFOID:0000000010308937
Low Pressure EGR Temperature Sensor is installed on the downstream of EGR cooler. The sensor detects
the low pressure EGR gas temperature. The sensor modifies a voltage signal from the ECM. The modified sig-
nal returns to the ECM as the exhaust gas temperature input.
<Reference data>
Electric Throttle Control Actuator
INFOID:0000000010308938
The Electric Throttle Control Actuator consists of position sensor, throttle valve, and DC motor. The position
sensor consists of a permanent magnet and Hall IC, and senses the valve position and feeds the voltage sig-
nals to the ECM. The ECM judges the current opening angle of the valve from this signals, and controls the
DC motor to make the valve opening angle in response to driving conditions.
Throttle valve is fully open when in non-operating status. When EGR is Performed or the engine is stopped,
this valve operates in direction that closes itself.
Intake Manifold Runner Control Valve
INFOID:0000000010308939
Intake Manifold Runner Control Valve is located on the intake manifold. This valve has position sensor. It
senses the valve position and feeds the voltage signals to the ECM.
Exhaust Electric Throttle Control Actuator
INFOID:0000000010308940
Exhaust Electric Throttle Control Actuator is installed to the exhaust tube and activated only during low pres-
sure EGR.
Exhaust gas temperature
°
C (
°
F)
Resistance (Approx.)
k
Ω
0 (32)
148.9 – 175.5
20 (68)
57.1 – 65.9
100 (212)
3.167 – 3.433
130 (572)
0.062 – 0.068