Infiniti QX4 service since 1996 of release
1. Introduction
2. Maintenance instruction
3. Routine maintenance
4. Engine
5. Cooling and heating systems
5.1. Specifications
5.2. Antifreeze - general information
5.3. Service of system of cooling
5.4. Removal, installation and check of serviceability of functioning of the thermostat
5.5. Removal, regenerative repair and installation of a radiator of system of cooling
5.6. Replacement of the water pump
5.7. Removal and installation of the fan of system of cooling
5.8. Air lines of distribution of air submitted to salon
5.9. System of automatic air conditioning – a design and a functioning principle
5.10. Design of a refrigerator path of central air of air
5.11. The To/in compressor, - the general information and a functioning principle
5.12. A receiver dehumidifier - the general information and service
5.13. Check of serviceability of functioning and service of systems of heating and air conditioning
5.14. Diagnostics of central air of air
6. Power supply systems and managements
7. Start and charge systems
8. Transmission line
9. Brake system
10. Suspension bracket and steering
11. Body
12. Electric equipment
 












5-14-diagnostika-sistemy-kondicionirovaniya-vozdukha.html

5.14. Diagnostics of central air of air

 PERFORMANCE ORDER

  1. Include ignition.
  2. Within 5 seconds after implementation of start of the engine press the OFF button on To/in control panels and hold it pressed during not less than 5 seconds.


Step 1 - check of light-emitting diodes and active zones of the display

 PERFORMANCE ORDER

  1. Make sure of serviceability of a luminescence of all light-emitting diodes.
  2. Check serviceability of functioning of all segments of active zones of the screen.
  1. If any light-emitting diodes does not burn, or defects of the screen take place the OFF switch, therefore, is faulty, or the fluorescent tube of the display failed. Replace the AUTO К/В amplifier.
  1. If everything is all right, pass to the following stage of check.


Check of serviceability of functioning of the HOT switch

 PERFORMANCE ORDER

  1. Press the К/В control panel switch (HOT).
  2. On the screen should the transition offer to a step of 2 checks («will be highlighted by Advance to self-diagnosis STEP 2?»), otherwise the HOT switch is damaged and it is necessary to replace the AUTO К/В amplifier.


Check of serviceability of functioning of the COLD switch

 PERFORMANCE ORDER

  1. Press the control panel switch (COLD).
  2. On the screen should the return offer to a step of 1 check («will be highlighted by Return to self-diagnosis STEP 2?»), otherwise the COLD switch is damaged and it is necessary to replace the AUTO К/В amplifier.


Step 2 – check of a condition of chains of the K/V information sensors on break and short circuit

 PERFORMANCE ORDER

  1. Press the switch (HOT) — on the screen the code No. 20 should be highlighted.
  1. If the code 20 is highlighted regularly, pass to the following stage of check, otherwise pass to the last stage.


Step 3 – check of serviceability of functioning of an inlet zaslonka and a zaslonka of switching of modes of circulation

 PERFORMANCE ORDER

  1. Press the switch (HOT) — on the screen the code No. 30 should be highlighted.
  1. If the code 30 is highlighted regularly, pass to the following stage of check, otherwise pass to the last stage.


Step 4 – check of serviceability of functioning of actuation mechanisms

 PERFORMANCE ORDER

  1. At the started engine press the switch (HOT).
  1. Nazhimaniye on the DEF button should lead to consecutive highlighting of codes with 41 on 46, confirming serviceability of functioning of all actuation mechanisms (see the following stage of check).


Identification of actuation mechanisms


ID card of conditions of the K/V actuation mechanisms

Code number Procedure for test of the actuation mechanism
Drive of a regime zaslonka Drive of an inlet zaslonka Drive of a mixing zaslonka Drive of the fan of a heater Compressor drive

41

The closed circulation

Maximum hladoproizvoditelnost

4 — 5В

It is included

42

The closed circulation

Maximum hladoproizvoditelnost

9 — 11В

It is included

43

20 percent supply of fresh air

Maximum heating

7 — 9В

It is switched off

44

100 percent supply of fresh air

Maximum heating

7 — 9В

It is switched off

45

100 percent supply of fresh air

Maximum heating

7 — 9В

It is included

46

100 percent supply of fresh air

Maximum heating

10 — 12В

It is included


Check of serviceability of functioning of a drive of switching of the directions of distribution of air

Position of the handle of a choice of the directions of distribution Direction of supply of air
On obverse level In foot wells On having blown in glasses

100 %

   

60 %

40 %

 

80 %

20 %

60 %

40 %

 

100 %


 PERFORMANCE ORDER

  1. The ID card (see the table the ID card of conditions of the K/V actuation mechanisms) allows to estimate serviceability of a condition of all actuation mechanisms used in To/in system.
  2. Also check serviceability of a drive of switching of the directions of distribution of air (see the table Check of serviceability of functioning of a drive of switching of the directions of distribution of air).
  3. At serviceable functioning of all actuation mechanisms pass to check point 9, otherwise make necessary regenerative repair.


Step 5 – Check of serviceability of functioning of sensors of temperature

 PERFORMANCE ORDER

  1. Press the switch (HOT) — on the screen the code No. 5 should be highlighted.
  1. Pass to the following stage of check.


Sensor of temperature of external air

 PERFORMANCE ORDER

  1. Once press the switch (DEF) — on the screen the indication of temperature of external air should be highlighted.

The conclusion to the screen of an inscription of ECON testifies to negative indications.

  1. If the displayed value considerably differs from real, it is necessary to check at first a condition of electroconducting of a chain of the sensor, then actually the sensor.


The air temperature sensor in salon


Example of a conclusion of identification codes of failures of the sensor switch of a zaslonka of switching of modes of distribution / air circulation


ID card of codes of indications of sensors switches of position of electromotors of a drive zaslonok

Code *, ** Provision of a zaslonka
On obverse level In foot wells

31

Zaslonka of switching of modes of circulation

32

34

35

36

37

Entrance zaslonka

38

20 percent supply of fresh air

39

100 percent supply of fresh air


* the Conclusion to the screen of the following indications testifies to a rassoyedineniye of the contact socket of electroconducting of the motor of a drive of a regime zaslonka: 32> 32> 34> 35> 36> return to 31.


* the Conclusion to the screen of the following indications testifies to a rassoyedineniye of the contact socket of electroconducting of the motor of a drive of an entrance zaslonka: 37> 38> 39> return to 37.


 PERFORMANCE ORDER

  1. Press the switch (DEF) repeatedly — on the screen the air temperature indication in salon should be highlighted.

The conclusion to the screen of an inscription of ECON testifies to negative indications.

  1. If the displayed value considerably differs from real, it is necessary to check at first a condition of electroconducting of a chain of the sensor, then actually the sensor.
  1. On an illustration the card of diagnostic codes of failures of sensors of temperature is presented.

  1. Example of a conclusion to the screen of a diagnostic code — see an illustration the Example of a conclusion of identification codes of failures of the sensor switch of a zaslonka of switching of modes of distribution / air circulation).


Check of serviceability of functioning of sensors switches of position of electromotors of a drive zaslonok

 PERFORMANCE ORDER

  1. During this check serviceability of functioning of sensors switches of a drive of an entrance zaslonka and a zaslonka of switching of modes of distribution / air circulation (see the table the ID card of codes of indications of sensors switches of position of electromotors of a drive a zaslonok) is defined.
  2. Example of a conclusion to the screen of an identification code of provision of a zaslonka — see an illustration the Example of a conclusion of identification codes of failures of the sensor switch of a zaslonka of switching of modes of distribution / air circulation).


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5.13. Check of serviceability of functioning and service of systems of heating and air conditioning
on the following page»
6. Power supply systems and managements