If an abnormal operation of any automatic transmission mechanism or sensor is detected, the control unit transfers the box to emergency mode... In such a situation, the vehicle can only move in third gear.
Vehicle movement in emergency mode
When the automatic transmission turns on the "emergency gang", the movement of the car in Drive mode, 4, 3 and 2 will be carried out only in 3rd gear. The vehicle will also start moving at 3rd speed.
You need to start with a light press on the accelerator. Then release the pedal and make a few short strokes. Likewise, it is possible to reduce the load on the transmission when starting from third gear.
Until the speed of 40 km / h is reached, which is the operating speed of the machine in third gear, do not press the accelerator pedal hard. Driving at a speed of 120 km / h is also strongly discouraged. In such situations, it will not lead to anything good.
At a similar pace of movement, you should quickly get to the service center. You can use the services of a tow truck that will deliver the vehicle for repair.
Switching the unit to emergency mode
On the automatic transmission, the emergency mode indicator may light up in the following malfunctions:
- oil level ATF fluids not normal;
- abnormal operation of the hydro-mechanical part of the box;
- failures in the electronic part.
Underfilling or overflow working fluid forces the automatic transmission to go into emergency mode. If the cause is overflow, the excess oil must be removed. If there is a shortage of oil fluid, one should look for the root causes that led to this phenomenon.
Violation of the integrity of the case of the automatic transmission or damage to the friction packs can lead to the fact that the transmission gets "into the emergency gang". V service centers service providers carry out visual and computer diagnostics of the unit to identify the source of the problem.
Electronic elements are becoming the most common culprits in the transition of automatic transmission to an emergency state. Defective temperature sensors translate stably automatic transmission in emergency mode, or the unit is switched into it after they are heated to operating temperatures. Damaged electrical wiring, all kinds of other sensors can also permanently or suddenly transfer the automatic transmission into an emergency state. If, when the control lever is moved to position D, a dull blow is heard, after which the machine gets into the emergency gang, then the breakdown should be looked for in the shaft rotation sensors. A malfunctioning control unit puts the automatic transmission into an emergency state, and does not allow you to get out of it during recovery manipulations.
These are the most common reasons. But it is worth remembering that an automatic transmission is a constructively complex device. Therefore, only an experienced auto mechanic should identify the exact reason for its transition to an emergency state.
Illumination of the automatic transmission emergency mode lamp on the instrument panel is a common problem for many car owners. It indicates critical unit malfunctions, due to which the box may need to be repaired. In this case, the car moves only in third gear.
Why does the automatic transmission emergency mode appear?
This can happen due to the following reasons:- Lack or excess of oil in the box is automatic, which affects the operation of the computer, which is why the light comes on. If there is an excess of fluid, it just needs to be removed, and the deficiency may indicate the presence of oil leaks that should be eliminated.
- Faults in the hydraulic or mechanical components of the box. Emergency mode can be activated due to physical damage to the unit, for example, wear of the clutches. In this case, the sump is removed, the condition of the oil is assessed. Based on the condition of the oil, a decision is made to remove and disassemble the automatic transmission.
- Breakdown of electronic or hydraulic systems... They occupy the lion's share of all cases of emergency mode occurrence. They should be considered separately. At a minimum, diagnostic equipment must be connected.
Electrical malfunctions and automatic transmission emergency mode
Among frequent problems with an electronic control system, which leads to an emergency mode, there are the following:- Damage to the temperature sensor. Because of it, the emergency mode glows constantly or after the transition to the operating temperature.
- Damage to the wiring and block connection chips. The mode is constantly on or appears without much consistency. The problem is eliminated by a long inspection of the wiring and all the chips.
- Breakdowns of various sensors: ABS, camshaft, air flow. Emergency mode is on permanently or from time to time, but not when changing gears. Computer diagnostics determine the cause.
- Defective output or input shaft rotation sensors. The problem makes itself felt when switching to "D" with a simultaneous thud. You can fix it after diagnosing and replacing the device.
- Defective control unit. It takes place if the emergency mode is permanently enabled and does not disappear. Computer diagnostics do not always determine the problem, so they resort to a trial replacement of the unit.
What is Transmission Emergency Mode? The owners of cars on mechanics do not know this. If you have a classic machine and the indicator lamp on dashboard, your gearbox has gone into Crash mode.
The automatic transmission goes into emergency mode due to many factors, the main ones being overheating of the box or a malfunction of the automation.
It must comply with the manufacturer's quality standards, and its level is set for cutting. If this is an overflow, it must be drained to the mark. Below the specified level - there is an oil leak.
In the event of a malfunction of the mechanical and hydraulic parts of the automatic transmission,
- Loss of adhesion - the machine slips, the dynamics of the car decreases
- There are jerks when shifting gears ( Typical problem wrong)
- Lost reverse or forward gears
The problem is in the operation of the mechanical or hydraulic parts of the automatic transmission. In this case, it is necessary to eliminate the problem at the root. The budget will be significantly different if the "disease" is eliminated at an early stage than if the box is ignored. Damage to the body, malfunction of the clutches, there are a lot of options here. It is necessary to remove the box and inspect each group separately.
If problems arise in terms of wear of parts, it should be remembered that every malfunction in modern units, as a rule, leads to a breakdown of the following parts in the chain. When jerks, jerks appear in the automatic transmission, the earlier the diagnosis is made, the less time and money the owner loses.
The indicator lights up when the box warms up to an operating state:
- Temperature sensor defective (replace)
- Rare oil change (Leads to increased wear of all internal parts of the automatic transmission)
The box falls into emergency mode, or the indication lights up when the vehicle is moving:
- Malfunction in the wiring (There is no good contact in the connection of the terminal blocks)
The box is in emergency mode, or the light comes on when changing speeds:
- Malfunction or poor contact of the sensor (Diagnostics required) The electronic control unit receives an incorrect signal from the sensors
Camshaft positions:
- Mass air flow
- Throttle position
- Other
Dull bang when the selector is set to position D
- The rotation sensor of one of the shafts is faulty (for diagnosis)
- Poor oil condition (shavings)
If the car does not leave the position of the Accident, then the electronic control unit is most often faulty.
The electronic control unit is one of the important components of the automatic transmission. On his shoulders lies the management of all processes of the box. When a malfunction occurs, the first step is to computer diagnostics ... ECU issues error code, by which you can quickly understand the malfunction and quickly eliminate it.
When problems arise in the electrics, things are a little more complicated. The scanner is not always able to identify places of poor contact (oxidation or short circuit). In case of a malfunction of this kind, it is necessary to inspect the problem contacts and their continuity.
Not all owners of cars with an automatic transmission are aware of what is emergency mode. In it, as a rule, the car is able to get under way and move exclusively in one gear - usually at 2nd or 3rd speed.
When this happens, this is the first reason to think about contacting the service - you may need another automatic transmission model. When the emergency mode is active, the electronics of the unit hints of a problem. You can only switch to the Parking lot to stop the car. Normal operation vehicle in such a situation it is difficult, because using one gear for movement to develop normal speed, it will not work.
What causes the emergency mode?
- friction dust;
- debris of metal;
- shavings, etc.
If any of this is found, then electronic diagnostics are needed automatic box or a careful study of each automatic transmission unit. Note that during scanning, all mechanical damage is not always detected with maximum accuracy.
- The "automatic" box constantly works in emergency mode or switches into it immediately after the unit warms up to normal temperature. A typical reason is a breakdown of the temperature sensor. Replacing it will resolve the issue. A little less often, this is caused by overheating, which will help to eliminate. In such a case, it is also worth checking the electrical wiring, block connection chips. Even a selective, selective replacement of chips often helps to eliminate the problem.
A possible cause of failure and activation of the emergency mode is sometimes a failure electronic system Automatic transmission.
Three weeks ago, in the morning I started the car and was going to drive the robot, when I switched the automatic transmission selector to position D, I heard a blow in the gearbox (this was not the case before). This alarmed me, but still continued to move. When I went I realized that the automatic transmission does not change gears and not a single gear is lit on the instrument panel, as if it was not powered. I got to work in third gear, 60 km / h - 3500 rpm, 80 km / h - 4200. It's not possible to drive 80 km / h - the oil temperature reaches almost 130 degrees and the oil can start blinking and beeping. I was very upset, I was already thinking about changing the automatic transmission to the manual transmission, since the repair would take from 1000 USD.
In the afternoon I tried to connect the computer and check the box through VAGKOM. Yes, for some reason I haven't seen the box before by VAGKOM. In short, I connected it - the same story. I didn’t get a thought out of my head - it’s not really a kick-ass box. In the evening I sat thinking, called the master on the boxes, so he says "yes you are a loshara, look at the automatic transmission fuse, there are two of them, there is no power on the automatic transmission, so she has become in emergency mode!" I got into the fuses, and for sure, the fuse on the automatic transmission burned out! Well, I think, now I will change the fuse and business for a penny, because this fuse is responsible not only for the automatic transmission, but also weighs on it: lights reverse, a washer, some kind of MULTI-FUNCTIONAL sensor that I do not understand (oh, I think they made it up!). I went for the fuse ...
I put on the fuse, turn on the ignition, I think now everything will work ... and the bolt ... the fuse blows. I am beginning to understand that not everything is so simple, somewhere there is a short circuit.
The next day, I negotiate with an electrician to find a short circuit. I leave the car for him, he calls me on my mobile an hour later and tells me that the automatic transmission has a MULTIFUNCTIONAL sensor (the one for which I mentioned above), and so it has a short circuit, in short, look for the sensor.
I found a second-hand sensor only in Poltava for $ 100, a new one costs $ 300.
It took a couple of days until the money was sent, sending by New Mail, while I took it.
Well, here's the sensor in my hands, I'm happy to crawl under the car, I think "I'll change two fingers", yeah, it was not there, it is in such a place, in such an ass that there will be no nichrome without a lift.
I called one service station, "ohh ... no, we don't want to deal with such a crap", I call another - they say that we need to remove the automatic transmission, prepare 250 greens, I call the third one, they say come.
I arrived. The guy drove the car onto the lift but did not promise anything, he said I will try. Half a day later, I heard a lot of ebucks from him on the phone and the diagnosis: it is necessary to remove the automatic transmission. The next day, this ill-fated contraption called "MULTI-FUNCTIONAL sensor" was replaced.
Replacing the sensor did not lead to success, the automatic transmission remained in emergency mode, VAGKOM also does not see the automatic transmission.
I went back to the electrician, who after a while announced the following diagnosis: the brain of the box came to an end. I left in search of brains. I came to work, climbed into EXIST to see how much new brains cost and almost got a heart attack, they have a price tag of 15700 UAH. I called for disassembly, they said "come, 100 bucks"
Fortunately, the repair was completed on these hundred bucks. Yura Evotech and Sasha Sashaa brought me brains from disassembly, for which a big THANKS to them! I connected them and everything worked.
Here's a story ...
The repair entailed the removal and installation of the automatic transmission - 1000 UAH, the multifunctional sensor is almost 900 UAH, 500 UAH - the services of electricians, and 800 UAH the brains of the automatic transmission
