Nissan Altima L32. Manual - part 488

MULTIPORT FUEL INJECTION SYSTEM

EC-1073

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Component Description

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1.

ASCD brake switch

2.

Stop lamp switch

3.

Brake pedal 

4.

ASCD steering switch

5.

ASCD clutch switch (M/T models)

6.

Clutch pedal

ALBIA0105ZZ

Component

Reference

A/F sensor 1

EC-1225, "Description"

Accelerator pedal position sensor

EC-1448, "Description"

Camshaft position sensor (PHASE)

EC-1296, "Description"

Crankshaft position sensor (POS)

EC-1292, "Description"

Engine coolant temperature sensor

EC-1210, "Description"

Fuel injector

EC-1483, "Description"

Heated oxygen sensor 2

EC-1242, "Description"

Intake air temperature sensor

EC-1207, "Description"

EC-1074

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MULTIPORT FUEL INJECTION SYSTEM

Knock sensor

EC-1289, "Description"

Mass air flow sensor

EC-1194, "Description"

Park/neutral position (PNP) switch (M/T)

EC-1382, "Description"

Power steering pressure sensor

EC-1371, "Description"

TCM (CVT)

EC-1382, "Description"

Throttle position sensor

EC-1215, "Description"

Component

Reference

ELECTRIC IGNITION SYSTEM

EC-1075

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ELECTRIC IGNITION SYSTEM

System Diagram

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System Description

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INPUT/OUTPUT SIGNAL CHART

*1: This signal is sent to the ECM via the CAN communication line.
*2: ECM determines the start signal status by the signals of engine speed and battery voltage.

SYSTEM DESCRIPTION

Ignition order: 1 - 2 - 3 - 4 - 5 - 6

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

JMBIA1967GB

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)

Engine speed*

2

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

TCM (CVT)
Park/neutral position (PNP) switch (M/T)

Gear position

Battery

Battery voltage*

2

Knock sensor

Engine knocking

Unified meter and A/C amp.

Vehicle speed*

1

EC-1076

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ELECTRIC IGNITION SYSTEM

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.

Component Parts Location

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1.

Power valve actuator 1

2.

Intake valve timing control solenoid 
valve (bank 1)

3.

Power steering pressure sensor

4.

Intake valve timing control solenoid 
valve (bank 2)

5.

VIAS control solenoid valves 1 and 2 6.

Fuel injector (bank 2)

7.

Ignition coil (with power transistor) 
and spark plug (bank 2)

8.

Crankshaft position sensor (POS)

9.

Engine coolant temperature sensor

10. Camshaft position sensor (PHASE) 

(bank 2)

11. ECM

12. Refrigerant pressure sensor

13. Battery current sensor

14. PNP switch

15. Condenser-2

16. Mass air flow sensor (with intake air 

temperature sensor)

17. EVAP service port

18. Camshaft position sensor (PHASE) 

(bank 1)

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