If your battery is dead mechanics, and the only donor nearby is a car with automatic transmission, it is important to assess the risks before “lighting up”. The main danger lies not in the type of transmission, but in difference in on-board network voltage and sensitivity of electronic control units (ECUs) of modern automatic transmissions. For example, if the ground wire is incorrectly connected to the body machine gun The PCM (Powertrain Control Module) fuse responsible for shifting gears may burn out. In 80% of cases, problems arise due to a violation of the sequence of actions, and not due to the very fact of connecting “mechanics” and “automatic”.
Key Point: you can light a cigarette, but only if three conditions are met - the donor battery is in good condition (voltage is not lower than 12.4 V), the correct sequence of connecting the terminals and the ignition is turned off on both cars. This is especially critical for machines with CVT (CVT) or robotic box (DSG, Powershift), where the electronics control the clutch. Even a momentary power surge can cause an error P0700 (transmission malfunction) and the need to reflash the unit.
This article contains step-by-step instructions taking into account the type of donor box, a model compatibility table, as well as list of cars that absolutely cannot be used for lighting (for example, Toyota Prius with hybrid system or BMW i3 with high voltage battery). Let's figure out why some service centers refuse to light a cigarette machine guns from mechanics, and what to do if after the procedure the “battery” or “check transmission” icon lights up on the dashboard.
Why does the type of gearbox affect the safety of lighting?
Main difference automatic transmission from mechanical in the context of smoking - the presence electronic solenoids and valve body, which control gear shifting. These components are extremely sensitive to voltage surges. For example, in Audi A4 (B9) with 7-speed S-Tronic box control unit (TCU) receives power directly from the battery. Risk of damage if lit incorrectly TCU reaches 30%, which will result in a repair cost of 50,000 rubles.
The second problem is difference in starting currents. To the starter mechanics requires an average of 200–300 A to start, whereas automatic (especially with a large engine volume) you may need 400–600 A. If the donor battery is weak or the wires are thin (cross-section less than 16 mm²), the voltage will drop below 10 V, which will lead to the ECU resetting. B Mercedes-Benz W205 this causes an error P0606 (engine control unit malfunction) and the need to adapt the throttle valve.
- 🔋 Donor battery: Must be fully charged (voltage 12.6–13.2 V). On vending machines with the system Start-Stop (for example, Volkswagen Golf 7) a discharge below 12.4 V is already considered critical.
- ⚡ Jump wires: minimum cross-section 20 mm² for diesel engines and 16 mm² for petrol engines. Cheap wires with thin strands heat up and create a voltage drop.
- 🚗 Recipient's condition: if on mechanics The battery is dead due to a current leak (for example, a faulty generator), lighting a cigarette will only temporarily solve the problem.
If the donor is hybrid (for example, Toyota Camry Hybrid), never connect wires to a 12-volt battery. Use the special terminals under the hood, marked with a "+" sign in a red circle.
Step-by-step instructions: how to properly light the mechanics of a machine gun
The algorithm of actions depends on which car is the donor. If this automatic, the ignition on it must be turned off throughout the entire procedure. Exception - cars with the system i-Stop (Mazda), where you need to turn on the ignition to activate the additional relay.
- Preparation: Turn off the donor engine, remove the key from the ignition. Make sure that all consumers (headlights, heater, radio) are turned off.
- Connecting the plus: connect the red wire to the “+” terminal of the discharged battery, then to the “+” terminal of the donor. Important: do not touch the body or engine with metal parts of the terminals.
- Ground connection: connect the black wire to the “−” terminal of the donor, and the other end to unpainted metal body part recipient (for example, a bolt on the engine block). This will reduce the risk of sparks near the battery.
- Launch: First start the donor and let it run for 5-7 minutes at 1500-2000 rpm. Then turn it off and try to start the recipient. If it doesn't work, try again in 10 minutes.
Check the voltage of the donor battery with a multimeter|Use wires with alligator clips and insulation|Make sure the polarity of the terminals matches|Disconnect all consumers in both cars-->
A critical error is an attempt to start the recipient while the donor is running. In this case the generator machine gun receives a load on two starters at once, which can lead to overheating of the diode bridge (replacement cost - from 8,000 rubles). On Ford Focus 3 with box PowerShift this also throws an error P0A0F (high voltage on-board network).
What to do if, after lighting a cigarette, the “check” on the machine lights up?
If the donor's dashboard (machine gun) an error has appeared, do not panic. In 60% of cases, this is a temporary failure that resets after 3-5 engine starting cycles. If the error remains (for example, P0715 — faulty automatic transmission input shaft sensor), diagnostics with a scanner is required (for example, Launch X431).
Which cars with automatic transmission cannot be used as donors?
Some models machine guns are absolutely not suitable for lighting due to the nature of electronics or high-voltage systems. For example, Tesla Model 3 has a 400-volt battery, and connecting it to another vehicle's 12-volt system may cause a short circuit. And in Hyundai Ioniq Electric The battery is integrated with the recovery system, and a voltage surge will cause the main relay to turn off.
| Make/Model | Reason for ban | Risks |
|---|---|---|
| Toyota Prius (hybrid) | High voltage battery (200+ V) | Damage to the inverter, repair cost ~200,000 rubles. |
| BMW i3 | Li-ion battery with BMS | Resetting the control system |
| Nissan Leaf | No generator, only recuperation | High voltage battery discharge |
| Mercedes-Benz S-Class (W222) with 9G-Tronic | Sensitive block TCU | Error P0717 (low sensor signal level) |
Also avoid smoking from machine guns with the system Start-Stop (for example, Skoda Octavia 4), if their battery is not designed for deep discharges (marking AGM or EFB). Such batteries lose capacity after 3–5 deep discharge cycles, and their service life is reduced by 30–40%.
Once a year|Every 2-3 months|Only in emergencies|Never-->
What happens if you light a cigarette incorrectly: consequences for the machine
The most common scenario is fuse blown in the block PCM or TCU. For example, in Kia Sportage 4 with box A6MF1 this is a fuse F18 (10A), responsible for powering the solenoids. Replacing it will cost 500 rubles, but if a power surge damages the solenoids themselves, repairing the box will cost 40,000–60,000 rubles.
Other possible consequences:
- 🔥 Short circuit in the generator circuit (typical for Renault Duster with Automatic transmission DP2).
- 📉 Resetting adaptations boxes (for example, Volvo XC60 with Aisin TF-80SC you will have to “teach” the transmission again).
- ⚡ Damage to the diode bridge generator (in Lada Vesta with AMT this leads to undercharging of the battery).
⚠️ Attention: if after lighting automatic-the donor began to twitch when changing gears, stop immediately and check the oil level in the box. A voltage surge could cause a false triggering of the pressure sensor, which leads to insufficient lubrication of the clutches.
Alternative ways to start the engine without lighting a cigarette
If the risks of lighting from machine gun seem too high, consider other options:
- Booster (starting device): modern models (for example, Carku E-Power-3) are safe for electronics and suitable for vehicles with Automatic transmission. The main thing is to observe the polarity and not connect the booster to the cigarette lighter (only directly to the terminals).
- Push launch: only suitable for mechanics. On vending machines (except for some models with
N) This method will damage the torque converter. - Charger: If you have access to an outlet, use charging mode
Boost(for example, Optimate 6). Important: do not exceed the charge current above 10% of the battery capacity.
For hybrids and electric vehicles the only safe way is to call a tow truck or mobile launch service (for example, "Battery people"). Torture to light a cigarette Toyota RAV4 Hybrid from a regular machine, 90% of cases end in error P0A80 (high voltage battery malfunction).
If the battery is mechanics discharged due to a faulty generator, lighting a cigarette will not solve the problem. After starting the engine, check the voltage at the terminals with a multimeter: when the engine is running, it should be 13.8–14.4 V.
Myths about lighting: what actually doesn’t affect the results
There are several misconceptions circulating on the Internet that have no technical basis:
- ❌ “You can only light a cigarette from a car with the same engine capacity”. It's not the power that really matters, it's the battery capacity and wire cross-section. For example, Lada Granta (1.6 l) can be safely lit from Toyota Land Cruiser 200 (4.6 l) if the wires are rated for 500 A.
- ❌ “You need to put the car in neutral”. Mode
P(parking) secures the box more reliably and prevents accidental movement of the car. - ❌ “Lighting a cigarette ruins the donor battery”. A one-time procedure does not reduce the battery life if it is in good condition. There is a risk only when the donor is deeply discharged (below 11.5 V).
Another common misconception is “lighting a cigarette with a wound-up donor is safer”. In fact, this increases the load on the generator machine gun and may lead to overheating. For example, on Honda CR-V with box ZF 9HP this causes an error P0620 (generator circuit malfunction).
FAQ: answers to frequently asked questions
Is it possible to light a diesel manual from a gasoline machine?
Yes, but with reservations. A diesel engine requires a higher starting current (up to 800 A), so the donor battery must be fully charged and the wires must have a cross-section of at least 25 mm². On automatic- before the procedure, it is recommended that the donor disconnect the negative terminal to avoid a voltage surge when starting the diesel engine.
Why did the fuse on the manual burn out after lighting the machine?
Most likely, the order of connecting the terminals was violated (for example, the “minus” was connected first). In this case, a short circuit occurs and the fuse in the unit trips. ECU. On mechanics this is less critical than automatic, but still requires checking the circuit with a multimeter.
Is it possible to light a cigarette from a vending machine with a start button (keyless)?
Yes, but two points need to be taken into account: 1) some models (for example, Lexus NX) require pressing the brake to activate the electronics even when lighting a cigarette; 2) if the key fob is discharged, the system may block the start. In this case, use the mechanical key included in the kit.
What to do if, after lighting a cigarette, the automatic transmission stops shifting gears?
Don't try to keep moving. Tow the car for diagnostics - most likely, a power surge has damaged the speed sensor or transmission solenoids. B Audi Q5 with 8-speed automatic This manifests itself as freezing in 3rd gear.
Is it possible to light a cigarette from a machine with a CVT?
It is possible, but with extreme caution. CVTs (CVT) are particularly sensitive to voltage surges due to the electronic control of the pulleys. On Nissan Qashqai J11 After incorrect lighting, an error often appears P17F0 (variator control circuit malfunction).