Nissan Sentra Service Manual: Electric ignition system

Nissan Sentra Service Manual / Engine / Engine control system / System / Electric ignition system

ELECTRIC IGNITION SYSTEM : System Description

SYSTEM DIAGRAM

*1: CVT models

*2: M/T models

Input/output signal chart

Sensor	Input Signal to ECM		ECM function	Actuator
Crankshaft position sensor (POS)	Engine speed*3 Piston position		Ignition timing control	Ignition coil (with power transistor)
Camshaft position sensor (PHASE)
Mass air flow sensor	Amount of intake air
Engine coolant temperature sensor	Engine coolant temperature
Throttle position sensor	Throttle position
Accelerator pedal position sensor	Accelerator pedal position
Transmission range switch*1	Gear position
Park/neutral position (PNP) switch*2
Battery	Battery voltage*3
Knock sensor	Engine knocking condition
Combination meter	CAN communication	Vehicle speed signal

*1: CVT models

*2: M/T models

*3: ECM determines the start signal status by the signals of engine speed and battery voltage.

SYSTEM DESCRIPTION

Firing order: 1 - 3 - 4 - 2

The ignition timing is controlled by the ECM to maintain the best air-fuel ratio for every running condition of the engine. The ignition timing data is stored in the ECM.

The ECM receives information such as the injection pulse width and camshaft position sensor (PHASE) signal.

Computing this information, ignition signals are transmitted to the power transistor.

During the following conditions, the ignition timing is revised by the ECM according to the other data stored in the ECM.

At starting
During warm-up
At idle
At low battery voltage
During acceleration

The knock sensor retard system is designed only for emergencies. The basic ignition timing is programmed within the anti-knocking zone, if recommended fuel is used under dry conditions. The retard system does not operate under normal driving conditions. If engine knocking occurs, the knock sensor monitors the condition.

The signal is transmitted to the ECM. The ECM retards the ignition timing to eliminate the knocking condition.

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