Infiniti FX35, FX50 (S51). Manual - part 770

AIR CONDITIONING CUT CONTROL

EC-621

< SYSTEM DESCRIPTION >

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AIR CONDITIONING CUT CONTROL

System Diagram

INFOID:0000000005237180

System Description

INFOID:0000000005237181

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

This system improves engine operation when the air conditioner is used.
Under the following conditions, the air conditioner is turned off.
• When the accelerator pedal is fully depressed.
• When cranking the engine.
• At high engine speeds.
• When the engine coolant temperature becomes excessively high.
• When operating power steering during low engine speed or low vehicle speed.
• When engine speed is excessively low.
• When refrigerant pressure is excessively low or high.

JMBIA1528GB

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor
Camshaft position sensor

Engine speed*

2

Air conditioner 
cut control

IPDM E/R

↓

A/C relay

↓

Compressor

Engine coolant temperature sensor

Engine coolant temperature

Accelerator pedal position sensor

Accelerator pedal position

Battery

Battery voltage*

2

Refrigerant pressure sensor

Refrigerant pressure

Power steering pressure sensor

Power steering operation

Unified meter and A/C amp.

Air conditioner ON signal*

1

Vehicle speed*

1

EC-622

< SYSTEM DESCRIPTION >

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AIR CONDITIONING CUT CONTROL

Component Parts Location

INFOID:0000000005589021

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

AIR CONDITIONING CUT CONTROL

EC-623

< SYSTEM DESCRIPTION >

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31. EVAP canister purge volume con-

trol solenoid valve

32. Manifold Absolute Pressure Sensor

(This sensor is not for controlling the 
engine system, nor for the on board 
diagnosis.)

33. Knock sensor (bank 2)

34. Crankshaft position sensor

35. Electric throttle control actuator 

(bank2)

36. VVEL actuator motor (bank 2)

37. VVEL control shaft position sensor 

(bank 2)

38. A/F sensor 1 (bank 2)

39. Engine coolant temperature sensor

40. Fuel injector (bank 2)

41. EVAP service port

42. Ignition coil (with power transistor) 

and spark plug (bank 2)

1.

Mass air flow sensor (bank 2)

2.

Mass air flow sensor (with intake air 
temperature sensor) (bank 1)

1.

Electric throttle control actuator 
(bank 2)

2.

Electric throttle control actuator 
(bank 1)

1.

Cooling fan relay-1

2.

Cooling fan relay-2

Vehicle front

JMBIA1536ZZ

JMBIA1537ZZ

JMBIA1538ZZ

EC-624

< SYSTEM DESCRIPTION >

[VK50VE]

AIR CONDITIONING CUT CONTROL

1.

Cooling fan motor-1

2.

Cooling fan control module-1

3.

Cooling fan motor-2

4.

Cooling fan control module-2

 Vehicle front

JMBIA1539ZZ

JMBIA1576GB

1.

A/F sensor 1 (bank 1) 

2.

A/F sensor 1 (bank 2) 

 Vehicle front

JMBIA1540ZZ

JMBIA1541ZZ