Service Infiniti QX4 since 1996 of release
1. Introduction
2. The maintenance instruction
3. Routine maintenance
4. The engine
5. Cooling and heating systems
6. Power supply systems and managements
7. Start and charge systems
8. A transmissionnaja line
8.1. 4-step automatic transmission
8.1.1. The general information
8.1.2. Problem diagnostics АТ - the general information
8.1.3. The Elektronno-hydraulic control system 4-step АТ
8.1.4. Removal and transmission installation
8.1.5. Replacement of an epiploon of lengthening of transmission
8.1.6. Removal and installation of cooler ATF
8.1.7. Removal and installation клапанной assemblages of a hydraulic contour of management АТ
8.1.8. Removal, check of a condition and installation приводного a cable of blocking of switchings
8.1.9. Adjustment of a drive of switching АТ
8.1.10. Adjustment of the gauge-switch of positions АТ / start permissions
8.1.11. Major repairs АТ
8.2. A distributing box
8.3. Differentials, power shafts / semiaxes
8.4. Kardannye shaft
9. Brake system
10. A suspension bracket and a steering
11. A body
12. An electric equipment


8.1.2. Problem diagnostics АТ - the general information

Refusals АТ occur on one of following five reasons more often: decrease in efficiency of return of the engine, infringement of adjustments, malfunctions of hydraulics, mechanical damages, or refusals of the onboard processor / of its alarm chain. The problem diagnostics always should begin with the most simple checks: estimate level and condition ATF (Routine maintenance see the Head), check up adjustment of a cable of management by a gear change and the gauge-switch of position of transmission. Further, spend trial runs of the car for the purpose of definition of efficiency of the brought corrections. If to eliminate a problem it was not possible, it is necessary to drive away the car on a car repair shop for more detailed diagnostics with application of the special equipment. The description of refusals АТ some of symptoms see Diagnostics of malfunctions of knots and car systems.

Primary checks


  1. Warm up transmission to normal working temperature during a short trip.
  2. Check up level ATF (Routine maintenance see the Head):
    • If the liquid has not enough, make corresponding updating, having added necessary quantity fresh ATF. Be convinced of correctness of the spent updating under indications measuring щупа, then check up transmission on presence of signs of external leaks (see more low);
    • If level is too high, merge surplus ATF, then check up it on presence of traces of presence of the cooling liquid, testifying infringement of tightness of internal partitions of the radiator separating its heat exchanger from lateral tanks with ATF (see the Head of System of cooling and heating);
    • If ATF it is made foam, empty transmission and fill with its fresh liquid, — merged check up on presence of traces of presence of a cooling liquid.
  3. Check up installation of turns of idling of the engine.

If the engine is not perfectly in order, it is not necessary to start performance of primary checks of transmission until corresponding corrections will be made.

  1. Check up freedom of moving of a cable of a drive throttle заслонки.
  2. Check up draught of a cable of management of a gear change (Adjustment of a drive of switching АТ see), make sure of correctness of adjustment and freedom of its moving.

Diagnostics of leaks ATF

The general information

The majority of leaks easily come to light at visual check. Repair usually consists in replacement of a corresponding defective epiploon or a lining. If to reveal a source of leak during external survey it is not possible, operate, as it is described more low.

First of all it is necessary to exclude probability of an error in definition of the nature of leak. It is not necessary to confuse ATF to impellent oil or a brake liquid (трансмиссионная the liquid usually has dark red colour).


  1. For revealing of a source of leak make short (some kilometres) a trip, then park the car over the spread blank leaf of a cardboard. After pair minutes the leak source can be revealed in the wake of a liquid dripping on a cardboard.
  2. Attentively examine a suspected site and a surface surrounding it, special attention giving to a joint interfaced прокладочных surfaces. For the purpose of expansion of a corner of the review take advantage of a pocket pocket mirror.
  3. If to reveal a leak source still it is not possible, carefully wipe a surface of a suspected site the rags moistened with solvent, then dry it.
  4. Make one more short trip, this time often changing speed of movement, then again examine the cleaned suspected site.

After revealing of a source of leak it is necessary to define and eliminate the reason of its development, and only then to pass to performance of a necessary recovery work. Replacement of the damaged lining will not lead to desirable result if to leave not eliminated the defect of the interfaced surface which have led to an exit of a lining out of operation. So, the deformed flange it is necessary отрихтовать.

In below-mentioned subsections the most typical reasons of development of leaks ATF and conditions which should be executed that there were no relapses are listed.

Part from the listed requirements cannot be executed without application of the special equipment. In this case the car should be driven away on a car repair shop.

Leaks through прокладочные surfaces

Periodically examine a cover on the right side картера transmissions. Check presence on the places and reliability of a tightening of fixing bolts, watch, that on a cover there were no traces of mechanical damages.

Excessively hard tightening of fixing bolts, damage of a sealing surface concern number of the possible reasons of development of leaks through a cover картера transmissions, lining destruction, and also occurrence of cracks or порозности walls картера. If the lining of a cover or картера transmissions is formed by a hermetic pillow, the probability of a wrong choice of type of the last is not excluded.

Leaks through epiploons and cuffs

Excessively high level ATF, infringement of passableness out of operation concern number of the most typical reasons of an exit of epiploons of transmission ventilating сапуна, mechanical damage of walls of a landing nest, damage actually an epiploon, or wrong installation of the last. The probability of damage of a pin of the shaft passed in an epiploon, or excessive люфт the last as a result of deterioration of bearings is not excluded also.

Check up a condition and correctness of landing of a sealing cuff of a directing tube measuring щупа. Periodically examine on presence of signs of leaks a surface around an arrangement приводной gear wheels of a speedometer or the gauge of speed (VSS). In case of need make replacement of a sealing ring.

Leaks through defects in walls картера transmissions

The reason of development of leaks ATF formation of cracks or a time in a body картера transmissions can be. Consult with experts of car-care centre.

Check up tightness choke knots of connection of hoses of cooler ATF.

Leaks through сапун and a jellied mouth

Leaks through сапун or a jellied mouth can occur owing to excessive filling of transmission, hit in ATF a cooling liquid, passableness infringement сапуна or returnable apertures.

On page back
8.1.1. The general information
On the following page
8.1.3. The Elektronno-hydraulic control system 4-step АТ