Nissan Note E12. Manual - part 171

COMPONENT PARTS

EC-23

< SYSTEM DESCRIPTION >

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Throttle Position Sensor

INFOID:0000000009022446

Electric throttle control actuator consists of throttle control motor,

throttle position sensor, etc. The throttle position sensor responds to

the throttle valve movement. 

The throttle position sensor has two sensors. These sensors are a

kind of potentiometer which transform the throttle valve position into

output voltage, and emit the voltage signals to the ECM. The ECM

judges the current opening angle of the throttle valve from these sig-

nals and controls the throttle valve in response to driving conditions

via the throttle control motor.

WARNING LAMPS/INDICATOR LAMPS
WARNING LAMPS/INDICATOR LAMPS : Engine Oil Pressure Warning Lamp

INFOID:0000000009022441

DESIGN/PURPOSE

When engine oil pressure is low, the engine oil pressure warning

lamp informs the driver of low oil pressure to prevent damage to the

engine.

BULB CHECK

Not applicable

OPERATION AT COMBINATION METER CAN COMMUNICATION CUT-OFF OR UNUSUAL SIG-
NAL

For the operation for CAN communications blackout or abnormal signal reception, refer to 

MWI-19, "Fail-safe"

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SYSTEM DIAGRAM

SIGNAL PATH

ECM calculates an engine oil pressure according to a signal transmitted from the engine oil pressure sensor.

When the engine oil pressure is low, ECM transmits the engine oil pressure warning lamp signal to combina-

tion meter via CAN communication. Then the engine oil pressure warning lamp illuminates.

SHUTOFF CONDITION

When any of the following conditions is satisfied:

• Ignition switch: OFF

• Engine oil pressure is the specified value or more.

LIGHTING CONDITION

PBIB0145E

JPNIA1881ZZ

JSBIA2846GB

EC-24

< SYSTEM DESCRIPTION >

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COMPONENT PARTS

When any of the following conditions is satisfied:

• Ignition switch: ON

• Engine oil pressure is less than specified value.

TIMING CHART

WARNING LAMPS/INDICATOR LAMPS : Malfunction Indicator Lamp (MIL)

INFOID:0000000009022439

DESIGN/PURPOSE

When a malfunction which increases exhaust gases is detected, ECM turns ON MIL and informs the driver of

the necessity of inspection and repair. 

When a malfunction which causes damage to the catalyst is

detected, ECM immediately blinks MIL to alert the driver. 

BULB CHECK

The bulb turns ON after turning ON the ignition switch (engine stop) and turns OFF after restarting the engine.

OPERATION AT COMBINATION METER CAN COMMUNICATION CUT-OFF OR UNUSUAL SIG-
NAL

For the operation for CAN communication blackout in the combination meter, refer to 

MWI-19, "Fail-safe"

. 

SYSTEM DIAGRAM

SIGNAL PATH

JPBIA6026GB

JSBIA1315ZZ

JPBIA6021GB

COMPONENT PARTS

EC-25

< SYSTEM DESCRIPTION >

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• When the lighting conditions of the malfunction indicator lamp (MIL) are satisfied, ECM transmits a malfunc-

tion indicator lamp (MIL) signal to the combination meter via CAN communication. 

• The combination meter turns ON or blinks the malfunction indicator lamp (MIL), according to a signal

received from ECM. 

LIGHTING CONDITION

When all of the following conditions are satisfied:

• Ignition switch: ON

• DTC which influences on exhaust gasses is judged.

For DTCs that the malfunction indicator lamp turns ON and the number of DTC diagnosis trips, refer to 

EC-76,

"DTC Index"

.

SHUTOFF CONDITION

When any of the following conditions is satisfied: 

• Ignition switch: OFF

• Erase DTC

NOTE:

For the conditions of erasing DTC, refer to 

EC-43, "DIAGNOSIS DESCRIPTION : DTC and Freeze Frame

Data"

.

TIMING CHART

JPBIA6022GB

EC-26

< SYSTEM DESCRIPTION >

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STRUCTURE AND OPERATION

STRUCTURE AND OPERATION

Positive Crankcase Ventilation

INFOID:0000000009022447

This system returns blow-by gas to the intake manifold.

The positive crankcase ventilation (PCV) valve is provided to conduct crankcase blow-by gas to the intake

manifold.

During partial throttle operation of the engine, the intake manifold sucks the blow-by gas through the PCV

valve.

Normally, the capacity of the valve is sufficient to handle any blow-by and a small amount of ventilating air.

The ventilating air is then drawn from the air inlet tubes into the crankcase. In this process the air passes

through the hose connecting air inlet tubes to rocker cover.

Under full-throttle condition, the manifold vacuum is insufficient to draw the blow-by flow through the valve.

The flow goes through the hose connection in the reverse direction.

On vehicles with an excessively high blow-by, the valve does not

meet the requirement. This is because some of the flow will go

through the hose connection to the air inlet tubes under all condi-

tions.

PBIB2962E

PBIB1588E