Nissan Altima L32. Manual - part 366

MULTIPORT FUEL INJECTION SYSTEM

EC-585

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Component Description

INFOID:0000000004349607

1.

No.1 ignition coil

2.

Cooling fan motor-1 harness con-
nector

3.

Cooling fan motor-2 harness con-
nector

4.

Refrigerant pressure sensor

5.

Accelerator pedal position sensor

6.

ASCD brake switch

7.

Stop lamp switch

8.

Brake pedal

9.

ASCD clutch switch

10. Clutch pedal

11. ASCD steering switch

12. CANSEC switch

13. RESUME/ACCELERATE switch

14. SET/COAST switch

15. MAIN switch

: Vehicle front

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Component

Reference

A/F sensor 1

EC-724, "Description"

Accelerator pedal position sensor

EC-924, "Description"

Camshaft position sensor (PHASE)

EC-787, "Description"

Crankshaft position sensor (POS)

EC-783, "Description"

EC-586

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[QR25DE EXCEPT FOR CALIFORNIA]

MULTIPORT FUEL INJECTION SYSTEM

Engine coolant temperature sensor

EC-711, "Description"

Fuel injector

EC-956, "Description"

Heated oxygen sensor 2

EC-739, "Description"

Intake air temperature sensor

EC-706, "Description"

Knock sensor

EC-781, "Description"

Mass air flow sensor

EC-693, "Description"

Park/neutral position switch

EC-870, "Description"

Power steering pressure sensor

EC-859, "Description"

Throttle position sensor

EC-714, "Description"

Vehicle speed sensor

EC-853, "Description"

Component

Reference

ELECTRIC IGNITION SYSTEM

EC-587

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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 through CAN communication line.
*2: 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) 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

JMBIA0174GB

Sensor

Input Signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)

Engine speed*

2

Piston position

Ignition timing 
control

Ignition coil (with power transis-
tor)

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

Battery

Battery voltage*

2

Knock sensor

Engine knocking

Park/neutral position (PNP) switch

Gear position

Combination meter

Vehicle speed*

1

EC-588

< FUNCTION DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

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.

Intake valve timing control solenoid 
valve

2.

Ignition coil (with power transistor) 
and spark plug

3.

Knock sensor,
Crankshaft position sensor (POS)

4.

Air fuel ratio (A/F) sensor 1

5.

Camshaft position sensor (PHASE)

6.

Engine coolant temperature sensor

7.

Park/neutral position (PNP) switch

8.

ECM

9.

Refrigerant pressure sensor

10. Battery current sensor

11. IPDM E/R

12. Mass air flow sensor (with intake 

temperature sensor)

13. EVAP service port

14. Electric throttle control actuator

(with built in throttle position sensor 
and throttle control motor)

15. EVAP canister purge volume control 

solenoid valve

16. Fuel injector

17. Power steering pressure sensor

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