Nissan Versa

 Sedan Service Manual

Engine » Engine control system (EC) » Engine control system
Crankshaft Position Sensor

The crankshaft position sensor is located on the cylinder block rear housing facing the gear teeth (cogs) of the signal plate at end of the crankshaft. It detects the fluctuation of the engine revolution.

The sensor consists of a permanent magnet and Hall IC.

When the engine is running, the high and low parts of the teeth cause the gap with the sensor to change.

The changing gap causes the magnetic field near the sensor to change.

Due to the changing magnetic field, the voltage from the sensor changes.

The ECM receives the voltage signal and detects the fluctuation of the engine revolution.

ECM receives the signals as shown in the figure.

ECM

The ECM consists of a microcomputer and connectors for signal input and output and for power supply. The ECM controls the engine.

Electric Throttle Control Actuator

Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc.

The throttle control motor is operated by the ECM and it opens and closes the throttle valve.

The current opening angle of the throttle valve is detected by the throttle position sensor and it provides feedback to the ECM to control the throttle valve in response to driving conditions via the throttle control motor.

Engine Coolant Temperature Sensor

The engine coolant temperature sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

<Reference data>

Engine coolant temperature [C (F)]	Voltage* (V)	Resistance (kΩ)
-10 (14)	4.4	7.0 11.4
20 (68)	3.5	2.10 2.90
50 (122)	2.2	0.68 1.00
90 (194)	0.9	0.236 0.260

*: These data are reference values and are measured between ECM terminals.

Engine Oil Pressure Sensor

The engine oil pressure (EOP) sensor is detects engine oil pressure and transmits a voltage signal to the ECM.

Accelerator Pedal Position Sensor

Air Fuel Ratio Sensor 1

Air Fuel Ratio Sensor 1 Heater

Battery Current Sensor

Camshaft Position Sensor

Crankshaft Position Sensor

Engine Oil Temperature Sensor

EVAP Canister Vent Control Valve

Exhaust Valve Timing Control Solenoid Valve

Fuel Injector

Fuel Pump

Heated Oxygen Sensor 2

Intake Air Temperature Sensor

Intake Valve Timing Control Solenoid Valve

Malfunction Indicator Lamp (MIL)

Mass Air Flow Sensor

Oil Pressure Warning Lamp

Throttle Position Sensor