Nissan Versa (N17): Electric ignition system

ELECTRIC IGNITION SYSTEM : System Diagram

ELECTRIC IGNITION SYSTEM : System Description

INPUT/OUTPUT SIGNAL CHART

*1: M/T models *2: A/T models or CVT models *3: ECM determines the start signal status by the signals of engine speed and battery voltage.

*4: This signal is sent to the ECM through CAN communication line.

SYSTEM DESCRIPTION

Firing order: 1 3 4 2 The ignition timing is controlled by the ECM to maintain the best airfuel 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 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 warmup
• 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 antiknocking 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.