If there are abnormal situations where the normal operation of the automatic box is not possible, the ECU includes the ACAP alarm mode and signals this on the inclusion of the corresponding lamp on dashboard.

What caused this reason? Is it possible to eliminate the problems in place?

Automatic gearbox when complying with the operating conditions recommended by the manufacturer, will serve 250 thousand km of mileage or up to 5 years. In fact, the real service life depends on the set of factors - driving style, frequency service etc. Automatic boxes are equipped with an electronic control unit, which is responsible for operating modes and implements all the necessary procedures for switching gear. If there are abnormal situations where the normal operation of the automatic box does not seem to be possible, the ECU includes the ACAP alarm mode and signals it on the inclusion of the corresponding lamp on the dashboard.

Why automatic transmission goes into emergency mode

The reasons for the transition of the automatic transmission to the emergency mode may be as follows:

1. a lack of transmission fluid. With insufficient amount of oil in automatic transmission the electronic unit Management includes emergency operation.
2. Fault electronic system Control. Automatic ACP errors can be caused by the failure of the automatic box.
3. Problems in the operation of hydraulics or mechanical elements of the "Automatic" box of the hydrotransformer, frictional wear, other hydraulic or mechanical damage include the alarm operation of the automatic transmission.

Leakage of transmission oil

Box "AUTOMA" goes into emergency mode in case of shortage transmission Oil. The flow may occur due to the failure of sealing gaskets, damage to the case, malfunctions of the automatic transmission. If, when inspection in a hole or on the lift, oil leaks are found, then it is necessary to refer to the specialists to eliminate faults as soon as possible. Most often it will be necessary to replace the transmission oil and sealing gaskets. In a specialized auto repair shop can determine the causes of leakage and eliminate them.

Control unit malfunctions

Non-standard operation of the gear computer can lead to the inclusion of the ACAP alarm. Typical problems of the control unit are incorrect frequency selection, shift blocking. To eliminate problems, you will need to diagnose the ECU, replacing the failed elements or the entire block, damaged loops, contact group.

Failure of hydraulic or mechanical parts

Self-diagnostic system When malfunctions in the mechanical or hydraulic part of the box will provide automatic transmission to the emergency mode. Common malfunctions are wear of frictional, hydroblock or torque converter faults. After diagnostics, the automatic transmission can be determined by the causes of the failure of individual parts.

Features of the ACAP Emergency Mode

If the automatic transmission has occurred to the emergency mode, then continue the movement only in the third gear. The speed of the car in this case is limited - no more than 60 km / h. Make a car when emergency mode (for example, in winter time) It is quite problematic.

Emergency mode The operation of the box "Automatic" is designed to come to a hundred without calling the tow truck. The operation of the car during emergency mode is not allowed, because it can lead to serious breakdowns and, as a rule, expensive overhaul Automatic transmission Therefore, in the event of an activation of the emergency mode, it is necessary to determine how to determine the cause of the "automatic" box input to this mode and eliminate the faults.

What to do when you turn on the emergency mode

Do not know what to do with automatic transmission automatic transmission? There are two solutions to the problem:

• Call masters. The specialist will diagnose the "Automatic" box, will determine why the automatic transmission stood in emergency mode, and, if possible, eliminates faults on the spot.
• To get to the car service. On the 3rd program you can get to a hundred, where the masters will diagnose and repair the car automatic transmission.

Of course, you can immediately go to a service station for diagnostics and repair, but it will be more convenient to call the electrician with departure to the place of breakage. The wizard will perform diagnostics and if the breakdown can be eliminated immediately, perform necessary work. So you can save time on a trip to the service with minor breakdowns, which, after the diagnostics, the exit auto electrician will be able to eliminate on the spot.

Safety light bulbs ACAP on the instrument panel is a frequent problem of many car owners. It testifies to the critical fault of the unit, due to which the repair of the box may need. In this case, the machine is moving only on the third gear.

Why does the ACAP alarm mode appear?

This may happen due to the following reasons:

1. The disadvantage or excess of oil in the automatic box, which affects the work of the ECU, which is why the light lights up. If an excess of fluid is observed, it is necessary to simply remove it, and the disadvantage may indicate the existence of oil leaks that should be eliminated.
2. Faults of the hydraulic or mechanical component of the box. Emergency mode may be included due to physical damage to the unit, for example, the wear of frictional. In this case, the pallet is removed, the condition of the oil is estimated. According to the state of the oil, the decision on the removal and analysis of the automatic transmission is made.
3. Electronic breakdowns or hydraulic Systems. They occupy a lion share of all cases of emergency regime. They should be considered separately. At a minimum, you need to connect diagnostic equipment.

Malfunctions Electricians and ASPP Emergency Mode

Among frequent problems With an electronic control system, which leads to emergency mode, distinguish such:

• Breaking temperature sensor. Because of it, the emergency mode is glowing constantly or after switching to the operating temperature.
• Damage to wiring and block connection chips. Mode is on constantly or appears without a special system. The problem is eliminated by a long inspection of wiring and all chips.
• Breakdowns of different sensors: ABS, camshaft, air flow. Emergency mode is on constantly or from time to time, but not when switching gear. Computer diagnostics determines the cause.
• Fault sensors of the output or input rotation of the shaft. The problem makes you know about yourself when switching to "D" with a simultaneous deaf blow. You can eliminate it after diagnosing and replacing the device.
• Defect of the control unit. It takes place if the emergency mode is on constantly and does not disappear. Computer diagnostics does not always define the problem, so they resort to a trial replacement of the unit.

Remember that the automatic transmission is a complex unit, the same problems in which they may indicate different breakdowns. Only experienced masters with special equipment can determine them.

Let's start with the fact that today there are several types of automatic transfers:, and. At the same time, various malfunctions are characteristic for each type of gearbox, and quite often and regardless of the type of box, the machine "gets up" into emergency mode.

In this article, we will consider the classic automatic transmission C (hydromechanical automatic transmission), which is an emergency mode for a machine machine of this type, and why the box automatically goes into an "accident".

Read in this article

Automatic ACPS mode: what it is

So, the transition of the gearbox to the emergency mode occurs if there is a breakdown or failure in the operation of the unit. In other words, the inclusion of the emergency mode on the machine signals the occurrence of certain problems.

In parallel, notifications are lit on the instrument panel signal lamps Check AT, Hold, Check Engine, etc. If the box "got up" into an accident, the car ceases to accelerate dynamically, disappears a sharp response to the press of the gas pedal, transmissions are not switched in D mode, etc. The fact is that in this mode, the auto is rolled and moving only in the third gear.

At the same time, the emergency mode itself can be considered protective, since its inclusion allows you to prevent a number of more serious damage Automatic transmission Another emergency mode of the automatic gearbox retains the ability to continue its movement to the nearest one hundred.

In other words, the automatic transmission can constantly drive in emergency mode, but you can get to the car service without either a tow truck. Now let's look at why and when the ACAP alarm mode is turned on, the reasons for its inclusion, as well as options and ways to solve the problem.

The automatic transmission rises in emergency mode: reasons

Let's start with the fact that modern automatic transmissions are a sufficiently complex aggregate. At the same time, as practice shows, several main reasons can be distinguished by the automatic transmission "falls" into an accident.

• First of all, a low or high level of ATF fluid in a box can lead to malfunctions, resulting in the inclusion of an emergency mode for the command of the ACAP ECU.

The decrease in the level can occur as a result of the leaks, while the excess often occurs due to errors during the service of the box. For example, overflowing the liquid into the automatic transmission leads to foaming, and the lack of oil starvation.

The result is a decrease in pressure and worsening of lubricant, rubbed surfaces in contact places are strongly wearing. Electronics fixes deviations from the norm, the emergency mode turns on, an error is prescribed into the computer the box.

For this reason, if the box switched to the emergency mode, you need. It is also recommended to carry out self-diagnosis of automatic transmission (with such an opportunity and the availability of skills to conduct this operation).

• Another reason may be the problems associated with work hydraulic devices, as well as problems in terms of mechanics. For example, the ACAP emergency mode may turn on if the case of the automatic box is damaged, slipped, worn, drop or "bedrooms", arose problems with GDT, etc.

In this case, you need to carry out in-depth diagnostics of automatic transmission. Check begins S. computer diagnosticsHowever, such scanning does not always allow you to get a clear idea of \u200b\u200bthe nature and cause of a malfunction.

In this case, it may be necessary to dismantle the PPC tray for inspection for the presence of pollution, friction dust, metal chips. In some cases, for defecting, it will also be necessary to completely remove the automatic box and disassemble the unit to assess the degree of wear and the state of individual elements.

• The third cause of the transition of the automaton in the emergency mode is the problems with the electronic automatic control system. At the same time, symptoms can be different, a malfunction can be "floating" or stored constantly.

For example, it works normally on a cold box, however, after warming up the automatic transmission immediately goes into emergency mode. In such a situation, the culprit often turns out to be a temperature sensor that requires replacement.

If the gearbox "drops" into emergency regime is unexpectedly, that is, regardless of various factors and conditions, then the reason for the banal damage to wiring, problems with contacts, etc. In this case, the experienced diagnostics checks the wiring and location of the compounds.

I will add if the gearbox suddenly goes into emergency mode, and such a transition occurs not during the gear shift, then the reason may be the sensors (sensor distribution Vala, etc.). In this case, you need a comprehensive.

Also, often problems with automatic transmission arise when the driver translates the selector to the D position or at the time of switching from 1 to 2 transmission. At this time, the box is heard in the box, then the ACAP alarm mode is turned on. In this situation, the chance of a breakdown of the shaft rotation sensors.

It should be remembered that the contacts of the sensors can oxidize or break, the fine wiring is often broken, the loops are abrained, etc. As a result, the connection is lost. It is also one of the answers to the question why the automatic transmission passed into emergency regime.

To diagnose automatic transmission in emergency error mode, it is better to read with a diagnostic scanner, since the self-diagnosis of the automatic transmission is not always able to identify the problem. If the diagnosis does not give results, then the breakdown should be searched manually (by checking the sensors, "transk" chains, etc.).

If the automatic box is all the time in emergency mode, it does not help restart the engine or reset errors, and the sensors and wiring are in order, then you should not exclude the likelihood of problems with the gear computer. In this case, it is often resorted to the method of replacement of the unit on a deliberately worker for verification purposes.

• A frequent reason for the output of the automatic transmission is contaminated / channel damage, the appearance of scaling in the valve plate, solenoid failures. In this case, the machine works in emergency mode. The reason is an increased sensitivity to the quality of oil in the automatic transmission and pressure of the liquid.

To avoid such a breakdown, it is necessary in a timely manner. Also need to use only such liquid ATF.which manufacturer allows for use in one or another type of automatic transmission.

Remember, mixing the transmission fluid different manufacturers It may lead to the fact that additive packages will react, as a result of oil properties will be changed and failures in the operation of the automatic transmission will occur.

It turns out if the box has passed into emergency mode, the oil level is normal, but its color, smell, viscosity and the general condition causes doubts, then diagnose the box and be ready, at a minimum,

That in the end

As can be seen, the reasons for which the emergency mode of the box automatic is turned on, quite a lot. At the same time, even rare inclusions of this mode, which are eliminated by restarting internal combustion engine, indicate that the problem with the machine is already there and with a high probability will only progress.

As for the errors themselves and failures, continuous driving by car, in which the box has passed into emergency mode, is not allowed. In other words, in this mode, you can only get to the car service, while avoiding loads on and automatic transmission.

Recall once again, before eliminating breakdown or failure, the full-time operation of the car with the automatic box in the emergency mode is prohibited! Moreover, if the automatic transmission has already been "left" into an accident, but when driving are heard outsided sounds During the operation of the machine (grinding, hum, crunch, blows), then it is better to refuse to drive to the service with its own way.

The optimal rhenium in such a situation will be the call to the tow truck, since the towing machine with a faulty machine without hanging the leading wheels can lead to even more serious consequences for automatic transmission, which is already faulty in itself and moved to the "accident" mode.

Read also

Why the box-machine is kicking, twitches automatic transmission when switching transmissions, jerk and strikes arise in an automatic box: the main reasons.

Reason first: level is not normal.

Meaning and nothing, and overflow. All this violates the work of the computer, forcing the emergency mode. When overflow, you just need to get rid of surplus. With a lack of fluid, you need to seek the cause of this phenomenon, eliminate leaks.

Reason for the second: Problems with the work of hydraulics or mechanical part of the automatic transmission.

Here the repair can very seriously facilitate the budget. IN aSPAP Emergency Mode May be upset due to damage to the body of the gearbox itself, the fault of the friction group. We will have to remove the pallet, inspect for the presence of foreign particles - friction dust, chips, metal fragments, and the like. If all this is present, you will have to explore each transmission element separately in search of the reason, or to conduct an electronic one. Although the scanning does not always define mechanical damage.

The reason is the third: Problems in the work of the electronic management system.

The most common reason why Automatic transmission rises in emergency mode. There are several situations that we will analyze separately.

The gearbox is either steadily in emergency mode, or moves to it after heating to operating temperatures. The reason may be a malfunction of the temperature sensor that should be replaced.

The gearbox is either stably in emergency mode, or it turns into it unexpectedly and unsystematic. The reason may be damage to the wiring between blocks, faults of some block connection chips. Eliminated by the nickname method of wiring, trial replacement of chips in turn, to identify faulty.

The gearbox is either steadily in emergency mode, or it turns into it suddenly, but not when switching speeds. The reason can be faulty sensors: camshafts, throttle valve, air flow, ABS. What specifically faulty helps to identify scanning.

When translating the lever in "D" hears a deaf blow, after which it turns on aSPAP Emergency Mode. Either this mode is included in the transition from the first to the second transmission. The reason in the breakdown of the rotation sensors of the input or output shaft. It can show scan. Eliminated by replacing sensors.

The gearbox is stably in emergency mode, does not want to leave it under any actions. Faulty control unit. Scanning does not always show it, so the trial replacement of the block helps.

Automatic transmission passed into emergency mode, video

We looked at typical cases when Automatic transmission passed into emergency mode. But it will not be worth noting that the automatic box is so complex mechanism that the same feature may correspond different damage. And only a specialist can be delivered. In order not to overpay for the repair, you still check the car in the car service.

Transmission of the gearbox to emergency mode occurs when serious failures have occurred to protect power plant From damage and alarm by car owner about the need to visit the maintenance station. The car refuses to dial the speed, transmission when selecting the "D" mode does not switch. On the dashboard lights up check indicators AT, HOLD, Check Engine, O / D OFF. The fault may disappear after restarting the engine. Emergency mode of operation allows you to deliver the car to the place of repair by its own pass, without resorting to the services of the tow truck.

Safety indicator "HOLD"

Deviation from the norm of the level of transmission oil

For normal work Copper box There are a certain range of the required amount of transmission fluid. An abnormal oil level capable of calling the ACAP alarm mode may be:

• overflow when transmission is higher than the recommended level;
• wasteing, occurring while reducing the amount of oil in the box below the norm.

Excess fluid in the automatic transmission leads to its foaming. Lighting surfaces are worse than lubricated and in contact places are formed. There is an increased wear of the gearbox items. Surplus oil can be thrown through a sapun. The malfunction of excess oil drains is eliminated. After that, you need to reset the error recorded in the memory of the electronic control unit.

The reasons why in the box not enough transmission fluid several:

1. During the maintenance, little oil was flooded. Diagnosed in level check. To eliminate the fault, it is enough just to add to the norm. It is important to use similar transmission. Otherwise there may be an automatic transmission chemical reactionwhich will entail a significant deterioration in properties;
2. The automatic transmission case has mechanical damage. What to do in this case depends on the degree of damage. If you continue to add oil, the box will switch to emergency mode with regular frequency. To detect the fault, you should detect leaks similar to those shown below. Elimination of breakage can be equal to the value of the new automatic transmission;
3. The failure of the gasket between the engine and the box. Diagnosed at the place of flow. Remedy requires replacement of gasket. It is not so easy to produce, as it may take a complete dismantling of the power plant with related units. Remove the separate machine is possible only on some cars. It is recommended to visit the service station, where the wizards will make repairs using special equipment;
4. Does not hold the seal. Repair can be made independently, replacing the element failed.

With oil starvation, accelerated wear of contact surfaces occurs. Detachable fragments pollute the transmission and increase the intensity of damage. The automatic transmission overheats and creates an additional load on the engine. Long ride S. low level Oils are fraught with costly repairs.

Violations of hydraulics or physical damage to automatic transmission

During self-diagnostics, the electronic control unit may detect a malfunction in the mechanical part of the automatic transmission, as a result of which it rises into the emergency mode. Friction wear is the most frequent reason why the box switches to abnormal mode. Electronic diagnosis It does not always work correctly and rarely shows the exact breakdown. It is necessary to take the analysis of the automatic transmission and visually inspect each item.

Broken gear teeth or pieces of frictional increases the wear of the accompanying automatic transmission elements. A long-term ride by car in which the box switched to emergency mode leads to expensive overhaul, so before the car owner removed and examined the Details of the automatic transmission, the operation of the car is not recommended.

Electronics failure

The culprit of problems with the electronic component of the gearbox can be:

• sensors;
• connecting loops;
• contact sockets.

Contacts of sensors may oxidize or tear off, and it becomes the reason why the automatic transmission passed into the emergency mode. The wiring used have a small cross section and tend to penetrate and rush. As a result, the information in the ECU ceases to flow.

To diagnose the culprit operation of the automatic transmission in the emergency mode, it is required to consider an error using a special scanner. Self-diagnosis is not always able to specify a faulty sensor, so it is recommended to visually examine in what state all available elements of the chain. If it is impossible to determine the breakdown, it is recommended to change the meters alternately and the emergency mode is turned on or not.

Abrasion of the channels of hydroblock

The box in which the oil has not changed in a timely manner has pollution of the channels of the hydroplate. The machine works with jamble plungers. Through channels transmission serves from increased pressure. Small fragments contained in liquid damage aluminum channels. The box can work in emergency mode.

In order for the problem with pollution, it is unexpectedly needed to monitor the state of the transmission fluid. The machine requires only high-quality oil. Modern mechanisms have become highly sensitive to incorrect maintenance. It is necessary to take action before the automatic transmission went into emergency regime.

Regardless of the reasons why automatic box Switched to the emergency mode, it is necessary to visit the service center or eliminate the breakdown yourself. If there is a suspicious cutter, it is necessary to include the emergency and call the tow truck, despite the fact that the machine allows you to move on. In this case, the continuation of operation becomes dangerous for the entire power plant, as it causes an accelerated wear of its nodes. It is important to remember that the breakdown does not go away by itself.

If you have any questions - leave them in the comments under the article. We or our visitors will gladly respond to them