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What is the S gear in an automatic transmission?

1 Answers
AnthonyMarie
07/29/25 12:20am
In an automatic transmission car, the S gear stands for Sport mode. The application scenarios of the S gear are as follows: 1. The S gear is the car's sport mode ("S" is the abbreviation of "Sport"). In S gear sport mode, the transmission can shift freely, but the shifting timing is delayed, keeping the engine at high RPM for a longer time. This allows the car to maintain low gear and high RPM for an extended period, resulting in greater torque output and acceleration. 2. While the car is moving, simply push the gear lever into the "S" position. It is typically used for climbing hills and quick overtaking. It is recommended to press the accelerator pedal deeply before overtaking, then release slightly and press deeply again. The transmission will automatically recognize this action and provide greater power output for overtaking.
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What do the plus and minus signs on an automatic transmission car's gear shift mean?

Automatic transmission car's gear shift plus and minus signs refer to the manual mode of the automatic transmission. The plus sign is for manually upshifting, and the minus sign is for downshifting. The method to use manual mode is: 1. Shift the gear to D, then push the gear lever to the right, and the transmission enters sport mode; 2. Use the method of pushing the gear lever forward and backward to shift gears, pushing forward to upshift and pushing backward to downshift; 3. To switch back to automatic mode, simply push the gear lever to the left to the D position. The gears of an automatic transmission car are: 1. P is for parking and starting; 2. R is for reverse; 3. N is for neutral; 4. D is for drive, also known as forward gear; 5. L is for low gear; 6. S is for sport mode; 7. OD is for overdrive.
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How Many Kilograms is One Liter of Gasoline Equal to?

One liter of gasoline equals 1.45 kilograms. Gasoline is a volatile and flammable hydrocarbon mixture liquid derived from the distillation, cracking, or pyrolysis of petroleum, used as fuel. It appears as a transparent liquid, primarily composed of aliphatic hydrocarbons, naphthenic hydrocarbons, and a certain amount of aromatic hydrocarbons. Gasoline has a high octane rating and can be classified by octane levels into: 89, 90, 92, 93, 95, 97, and 98. Based on the manufacturing process, gasoline can be categorized into: straight-run gasoline, thermal cracking gasoline, catalytic cracking gasoline, catalytic reforming gasoline, polymerization gasoline, hydrocracking gasoline, alkylation gasoline, and synthetic gasoline. The characteristics of gasoline include: 1. Volatility; 2. Stability; 3. Anti-knock quality; 4. Corrosiveness; 5. Cleanliness.
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Do I need to remove the card when not using ETC?

It can be removed, but the ETC device will not function without the card. According to the "Rules for Using the Non-stop Rapid Passage System," the ETC card must be inserted into the OBU device for normal operation; otherwise, user information cannot be read. If the card is removed, you can use the manual lane and have the staff swipe the card. When inserting the ETC card into the OBU device, there will be a prompt sound, indicating that the device is activated. Without the card, the device remains in a dormant state and cannot recognize vehicle information at toll stations, so you need to reinsert the card when you want to use it. ETC is an electronic toll collection system, also known as an automatic road toll system. It is a specialized method for collecting tolls on roads, commonly used on highways, toll bridges or tunnels, and certain urban sections to alleviate traffic congestion. ETC Deduction Principles: Highways have one or more ETC lanes. Through dedicated short-range microwave communication between the vehicle-mounted electronic tag installed on the windshield and the microwave antenna in the ETC lane, computer networking technology is used for backend settlement with banks, allowing vehicles to pass toll stations without stopping. This operates on the principle of "pass first, deduct later." Benefits of Installing ETC: Time-saving: Eliminates the hassle of waiting in queues. Green and eco-friendly: Reduces noise and exhaust emissions by eliminating stops at toll stations. Cost-saving: Reduces wear and tear, fuel consumption, and offers a 5% discount on toll fees. Improved efficiency: ETC lanes can theoretically process vehicles 2-3 times faster, making traditional ETC more advanced and efficient. Compared to license plate payment, ETC technology is more mature and advantageous. More policy support: The State Council's "13th Five-Year Plan for the Development of a Modern Comprehensive Transportation System" explicitly states the goal of "achieving interoperability of transportation cards in key city clusters by 2020 and significantly increasing the proportion of vehicles equipped with ETC," with a target of "50% ETC usage rate for road passenger vehicles by 2020." Future possibilities: Beyond improving the convenience of ETC installation and usage rates for passenger vehicles, future efforts will promote ETC use for trucks and explore deeper integration of ETC systems with vehicle-to-vehicle communication, vehicle-to-infrastructure coordination, and other smart transportation developments, providing comprehensive travel services for vehicle owners. This means more application scenarios will support ETC usage.
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What causes the ABS light to come on after vehicle inspection?

There are multiple states of the ABS warning light, with different causes and solutions for each state, as detailed below: State 1: ABS warning light stays on constantly (most common). Cause 1: The ABS wheel speed sensor's sensing area is covered by mud, dirt, or other contaminants, affecting its ability to detect the corresponding speed signal. This prevents the ABS control module from determining the vehicle speed and wheel slip rate, thus failing to issue appropriate commands to regulate braking. Solution: Clean the dirt from the wheel speed sensor and adjust the gap between the sensor and the signal ring to restore normal function. Cause 2: Loose connections between system wiring or poor contact in ABS relays causing signal issues and system failure. Solution: Check wiring connections and reconnect any loose parts. State 2: ABS warning light comes on intermittently, turning off during acceleration. Cause: When multiple vehicle electrical devices are in use, the battery voltage drops below 10.5V. The ABS warning light turns off as engine speed increases and voltage rises. This may also occur due to insufficient power supply voltage to the ABS system, such as poor terminal contact or grounding issues. Solution: Check the battery's specific gravity; inspect the charging system; examine the power supply (e.g., voltage relay or poor power contact). State 3: ABS warning light stays on after engine start until the engine is turned off. Cause: Poor grounding contact in the ABS hydraulic valve body; poor electrical connector contact in the ABS hydraulic valve body; ABS control module failure. Solution: Loosen and then retighten the grounding screw on the hydraulic valve body, cleaning the contact surface if necessary; check for increased gap in connectors; replace the ABS or ABS/ASR control module. State 4: ABS warning light comes on during high-speed driving. Cause: During high-speed driving, the ABS control module detects a significant difference between rear and front wheel speeds; incorrect tire or wheel rim specifications. Solution: Refer to the vehicle's tire and wheel rim specifications, as indicated on the label near the fuel tank cap. State 5: ABS warning light comes on intermittently. Cause: Improper adjustment of the brake light switch; poor internal contact in the brake light. Solution: With the engine running, press the brake pedal and use a finger to push the brake switch linkage all the way down, then release the brake pedal to complete the self-setting position; replace the brake light switch if necessary. If the ABS warning light is on, it is advisable not to continue driving. The illuminated ABS light indicates a fault in the vehicle's anti-lock braking system. During emergency braking, if the wheels lock up, the vehicle may skid uncontrollably, preventing the driver from slowing down or adjusting the vehicle's trajectory, posing significant safety risks.
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