Service of the Infiniti QX4 since 1996 of release
1. Introduction
2. Maintenance instruction
3. Routine maintenance
4. Engine
5. Cooling system and heating
5.1. Specifications
5.2. Antifreeze - general information
5.3. Service of the cooling system
5.4. Removal, installation and check of serviceability of functioning of the thermostat
5.5. Removal, recovery repair and installation of a radiator of the cooling system
5.6. Replacement of the water pump
5.7. Removal and installation of the fan of the cooling system
5.8. Air ducts of distribution of the air given to salon
5.9. System of automatic air conditioning – a design and the principle of functioning
5.10. Structure of the refrigerator highway of the air conditioning system
5.11. The K/V compressor, - the general information and the principle of functioning
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 the air conditioning system
6. Feed and control systems
7. Systems of start and charge
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 the air conditioning system

 PERFORMANCE ORDER

  1. Include ignition.
  2. Within 5 seconds after implementation of start of the engine press the OFF button on the K/V control panel and hold it pressed within 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 do not burn, or defects of the screen take place, therefore, the OFF switch is faulty, or the fluorescent tube of the display failed. Replace the AUTO K/B amplifier.
  1. If everything is all right, you pass to the following stage of check.


Check of serviceability of functioning of the HOT switch

 PERFORMANCE ORDER

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


Check of serviceability of functioning of the COLD switch

 PERFORMANCE ORDER

  1. Press the switch (COLD) of the control panel.
  2. On the screen has to the offer of return to a step of 1 check will be highlighted ("Return to self-diagnosis STEP 2?"), otherwise the COLD switch is damaged and it is necessary to replace the AUTO K/B 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 has to 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 the inlet gate and gate of switching of the modes of circulation

 PERFORMANCE ORDER

  1. Press the switch (HOT) — on the screen the code No. 30 has to 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. Has to lead Nazhimaniye on the DEF button 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

Number of a code Procedure for test of the actuation mechanism
Drive of the regime gate Drive of the inlet gate Drive of the mixing gate Heater fan drive Compressor drive

41

The closed circulation

Maximum refrigerating capacity

4 — 5B

It is included

42

The closed circulation

Maximum refrigerating capacity

9 — 11B

It is included

43

20 percent supply of fresh air

Maximum heating

7 — 9B

It is switched off

44

100 percent supply of fresh air

Maximum heating

7 — 9B

It is switched off

45

100 percent supply of fresh air

Maximum heating

7 — 9B

It is included

46

100 percent supply of fresh air

Maximum heating

10 — 12B

It is included


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

Position of the handle of the choice of the directions of distribution Direction of air supply
On front 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 the K/V system.
  2. Also check serviceability of the drive of switching of the directions of distribution of air (see the table Check of Serviceability of Functioning of the Drive of Switching of the Directions of Distribution of Air).
  3. At correct functioning of all actuation mechanisms you pass to point 9 of check, otherwise make necessary recovery 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 has to be highlighted.
  1. You 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 has to be highlighted.

Conclusion to the screen of the inscription ECON testifies to negative indications.

  1. If the displayed value considerably differs from real, it is necessary to check at first a condition of an electrical wiring 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 the gate of switching of the modes of distribution / air circulation


ID card of codes of indications of sensors switches of provision of electric motors of the drive of gates

Code *, ** Position of the gate
On front level In foot wells

31

Gate of switching of the modes of circulation

32

34

35

36

37

Entrance gate

38

20 percent supply of fresh air

39

100 percent supply of fresh air


* A conclusion to the screen of the following indications testifies to a rassoyedineniye of the contact socket of an electrical wiring of the motor of the drive of the regime gate: 32> 32> 34> 35> 36> return to 31.


* A conclusion to the screen of the following indications testifies to a rassoyedineniye of the contact socket of an electrical wiring of the motor of the drive of the entrance gate: 37> 38> 39> return to 37.


 PERFORMANCE ORDER

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

Conclusion to the screen of the inscription ECON testifies to negative indications.

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

  1. Example of a conclusion to the screen of a diagnostic code — see the illustration Example of a Conclusion of Identification Codes of Failures of the Sensor Switch of the Gate of Switching of the Modes of Distribution / Air Circulation).


Check of serviceability of functioning of sensors switches of provision of electric motors of the drive of gates

 PERFORMANCE ORDER

  1. During this check serviceability of functioning of sensors switches of the drive of the entrance gate and gate of switching of the modes of distribution / air circulation is defined (see the table the ID card of codes of indications of sensors switches of provision of electric motors of the drive of gates).
  2. Example of a conclusion to the screen of an identification code of position of the gate — see the illustration Example of a Conclusion of Identification Codes of Failures of the Sensor Switch of the Gate of Switching of the Modes of Distribution / Air Circulation).


"on the page back
5.13. Check of serviceability of functioning and service of systems of heating and air conditioning
on the following page"
6. Feed and control systems




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