Infiniti FX35, FX50 (S51). Manual - part 767

MULTIPORT FUEL INJECTION SYSTEM

EC-609

< SYSTEM DESCRIPTION >

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1.

Stop lamp switch

2.

ASCD brake switch (ASCD models)
ICC brake switch (ICC models)

3.

Brake pedal

4.

ECM

1.

ICC steering switch

2.

CANCEL switch

3.

RESUME/ACCELERATE switch

4.

SET/COAST switch

5.

DISTANCE switch

6.

MAIN switch

7.

LDP switch

1.

ASCD steering switch

2.

CANCEL switch

3.

RESUME/ACCELERATE switch

4.

SET/COAST switch

5.

MAIN switch

1.

Snow mode switch

JMBIA1509ZZ

JMBIA1507ZZ

JMBIA1508ZZ

JMBIA1623ZZ

EC-610

< SYSTEM DESCRIPTION >

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MULTIPORT FUEL INJECTION SYSTEM

Component Description

INFOID:0000000005237175

Component

Reference

A/F sensor 1

EC-805, "Description"

Accelerator pedal position sensor

EC-1074, "Description"

Camshaft position sensor

EC-877, "Description"

Crankshaft position sensor

EC-873, "Description"

Engine coolant temperature sensor

EC-790, "Description"

Fuel injector

EC-1103, "Description"

Heated oxygen sensor 2

EC-820, "Description"

Intake air temperature sensor

EC-787, "Description"

Knock sensor

EC-870, "Description"

Mass air flow sensor

EC-745, "Description"

Power steering pressure sensor

EC-957, "Description"

Throttle position sensor

EC-795, "Description"

ELECTRIC IGNITION SYSTEM

EC-611

< SYSTEM DESCRIPTION >

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ELECTRIC IGNITION SYSTEM

System Diagram

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System Description

INFOID:0000000005237177

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 - 8 - 7 - 3 - 6 - 5 - 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 signal. Comput-
ing 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

JMBIA1527GB

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor

Engine speed*

2

Piston position

Ignition timing 
control

Ignition coil
(with power transistor)

Camshaft position sensor

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

Gear position

Battery

Battery voltage*

2

Knock sensor

Engine knocking

Unified meter and A/C amp.

Vehicle speed*

1

EC-612

< SYSTEM DESCRIPTION >

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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

INFOID:0000000005589020

1.

IPDM E/R

2.

VVEL control module

3.

Battery current sensor

4.

VVEL actuator motor relay

5.

Cooling fan relay-1

6.

Cooling fan relay-2

7.

Mass air flow sensor (bank 2)

8.

Refrigerant pressure sensor

9.

Exhaust valve timing control position 
sensor (bank 2)

10. Exhaust valve timing control sole-

noid valve (bank 2)

11.

Camshaft position sensor (bank 2)

12. Intake valve timing control solenoid 

valve (bank 2)

13. Cooling fan motor-1

14. Cooling fan control module-1

15. Cooling fan motor-2

16. Cooling fan control module-2

17. Intake valve timing control solenoid 

valve (bank 1)

18. Camshaft position sensor (bank 1)

19. Exhaust valve timing control sole-

noid valve (bank 1)

20. Exhaust valve timing control position 

sensor (bank 1)

21. Mass air flow sensor (with intake air 

temperature sensor) (bank 1)

22. ICC brake hold relay (ICC models)

23. Brake booster pressure sensor

24. Ignition coil (with power transistor) 

and spark plug (bank 1)

25. VVEL actuator motor (bank 1)

26. VVEL control shaft position sensor 

(bank 1)

27. Fuel injector (bank 1)

28. Electric throttle control actuator 

(bank 1)

29. A/F sensor 1 (bank 1)

30. Knock sensor (bank 1)

JMBIA1535ZZ