Nissan March K13. Manual - part 220
SYSTEM
EC-341
< SYSTEM DESCRIPTION >
[HR12DE (TYPE 2)]
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*1: ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to the ECM through CAN communication line.
SYSTEM DESCRIPTION
Firing order: 1 - 2 - 3
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) sig-
nal. 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.
AIR CONDITIONING CUT CONTROL
Sensor
Input signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Engine speed
*1
Piston position
Ignition timing
control
Ignition coil (with power tran-
sistor)
Camshaft position sensor (PHASE)
Manifold absolute pressure (MAP) sensor
Amount of intake air
Engine coolant temperature sensor
Engine coolant temperature
Throttle position sensor
Throttle position
Accelerator pedal position sensor
Accelerator pedal position
Park/neutral position (PNP) switch (M/T mod-
els)
PNP signal
Transmission range switch (A/T models)
Battery
Battery voltage
*1
Knock sensor
Engine knocking
Combination meter
Vehicle speed signal
*2