Nissan Note [1623/1872] Ec 1623

Nissan Note [1623/1872] Ec 1623
ENGINE CONTROL SYSTEM
EC-1623
[K9K]
C
D
E
F
G
H
I
J
K
L
M
A
EC
PURPOSE OF THE EGR SYSTEM
Exhaust gas recirculation is used to reduce the nitrogen oxide (NOx) content of the exhaust gases.
The ECM authorises gas to pass by controlling an EGR volume control valve.
OPERATING PRINCIPLE
The valve is controlled by an RCO (Opening Cyclic Ratio) signal sent by the ECM. The RCO signal modulates
the opening of the valve and consequently the quantity of exhaust gas directed back to the intake manifold.
The ECM continuously carries out a test to detect the position of the EGR volume control valve.
NOTE:
The position of the EGR volume control valve is determined by the calculation of the amount of air taken in by
the engine.
OPERATING CONDITIONS
The parameters which determine the activation of the EGR volume control valve are as follows:
Engine coolant temperature
Intake air temperature
Ambient barometric pressure
Accelerator pedal position
Injected fuel flow
Engine speed
Operating point for the EGR volume control valve test:
The EGR volume control valve is activated when:
Intake air temperature is > 15 °C(59°F) and engine coolant temperature is > 70 °C(158°F)
Intake air temperature is > 50 °C(122°F) and engine coolant temperature is > 40 °C(104°F)
Engine speed is between 850 and 1,000 rpm
Injected fuel flow is between 2 and 5 mg/stroke
Ambient barometric pressure is between 980 and 1,000 mbar
In this case, the CONSULT-II can read an RCO value of the EGR volume control valve equals to 16%.
EGR function is disabled if:
Battery voltage is less than 9 V
Engine speed is below 500 rpm
Mapping (engine speed/load) exceeds a given threshold
Air conditioning compressor is activated
The EGR volume control valve is not supplied for 2 seconds after the engine starts.
If there is a malfunction in:
EGR volume control valve
Turbocharger boost sensor
the operation of the EGR volume control valve is cut.
1. Position sensor signal
(sensor signal)
2. Position sensor earth
(sensor ground)
3. Position sensor feed
(sensor power)
4. Valve earth control
(ground control)
5. Not used 6. Valve feed
(power supply)
MBIB1482E

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