What Causes a Car Air Conditioner to Break Down?

What Causes the Keyless Entry Door Handle Button to Malfunction?

Keyless entry door handle button malfunctions can be attributed to the following reasons: Circuit Board Failure: If the keyless entry door handle button is unresponsive, it may be due to a malfunction in the smart key's circuit board, causing the sensing system to fail to provide feedback. In such cases, if the issue cannot be resolved immediately, you can use the backup function on the smart key to unlock the door and use the vehicle, then visit a 4S store for inspection and repair at a later time. Recognition Interference: Keyless entry utilizes advanced RFID (Radio Frequency Identification) technology and identity code recognition systems, which can sense the owner's proximity to the vehicle without the need for traditional mechanical keys to unlock the door or start the vehicle. As long as the system detects the smart chip key on the user, it will unlock all vehicle permissions, allowing the owner to use the car seamlessly.

17

1

Share

What are the requirements for the reverse parking test in Subject 2?

Subject 2 reverse parking standards include: failure to follow the prescribed route or sequence, vehicle body crossing the line, failure to complete the parking, or exceeding the time limit of 4 minutes, all of which result in disqualification. The following is an introduction to Subject 2: 1. Test content: Subject 2, also known as the small road test, is part of the motor vehicle driver's license assessment and refers to the field driving skill test. For small cars (C1/C2), the test items include five mandatory components: reverse parking, parallel parking, stopping and starting on a slope, right-angle turns, and curve driving. 2. Key points for the reverse parking test: (1) Without reference points, you can only observe the vehicle's position through the rearview mirrors. Therefore, during practice, it is essential to strengthen the use of rearview mirrors. (2) During the test, stopping is not allowed, which places higher demands on clutch control. During practice, it is crucial to frequently use the clutch and learn to flexibly control the vehicle speed with the clutch, ensuring the vehicle moves slowly without stopping, maintaining a speed of around 5 km/h, to complete the entire reverse parking maneuver smoothly.

17

0

Share

How are spark plug models classified?

Spark plug models can be classified by material into: nickel alloy spark plugs, platinum spark plugs, and iridium spark plugs; by shape into: standard spark plugs, extended tip spark plugs, electrode spark plugs, seat spark plugs, pin spark plugs, and surface gap spark plugs. Spark plug replacement cycle: Under normal maintenance conditions, replacement is recommended after driving 40,000 to 60,000 kilometers. However, this may vary depending on the brand and engine, so it's advisable to follow the user manual. The following maintenance standards can be referenced: Platinum spark plugs should be replaced at 40,000 kilometers, ordinary nickel alloy spark plugs at 20,000 kilometers, and iridium spark plugs at 60,000 to 80,000 kilometers. Spark plugs are installed on the side or top of the engine. Early spark plugs were connected to the distributor via ignition cables, but over the past decade, most car engines have switched to direct connection between the ignition coil and the spark plug.

13

4

Share

Should the Positive or Negative Terminal Be Removed First When Disconnecting a Car Battery?

When disconnecting a car battery, the negative terminal should be removed first. Steps for disconnecting the battery: Turn off the ignition and remove the key; disconnect the negative battery terminal; remove the positive terminal protective cover; disconnect the positive battery terminal; remove the battery securing device; take out the battery; reverse the steps for installation. Note: During installation, connect the positive terminal first, followed by the negative terminal. After battery installation, perform necessary initial settings for your vehicle according to the user manual. Function of the battery: The battery is a crucial component in a car and is also a wearable part that requires regular replacement. When the engine is not running, the battery supplies power to the car; after starting the engine, the alternator powers the car's electronic devices. Battery replacement timing: The battery needs to be replaced periodically. A typical car battery lasts 3 to 4 years. Over time, the battery's charging capacity diminishes, indicating the need for replacement. Before winter arrives, it is advisable to check the battery. If the battery's internal resistance and voltage do not meet standard values, replacement is also necessary.

9

4

Share

What are the causes of abnormal rail pressure?

Abnormal rail pressure may occur due to the following reasons: Faulty pressure switch: The engine utilizes a high-pressure common rail injection system to control fuel supply, where multiple cylinder injectors are fed by a single high-pressure fuel rail. If the fuel in the rail becomes insufficient due to pressure-related issues, it reduces the engine's power output per unit time, leading to abnormal rail pressure. Clogged oil passage: As engine oil passes through the fine pores of the oil filter, solid particles and viscous substances are trapped in the filter. A clogged filter prevents smooth oil flow, potentially rupturing the filter element or activating the safety valve, allowing unfiltered oil to bypass through the relief valve and carry contaminants back to lubrication points. Airborne pollutants may accumulate around the PCV valve, potentially causing blockage. A clogged PCV valve can cause contaminated gases to flow backward into the air cleaner, polluting the filter element and reducing filtration efficiency. This results in dirtier air-fuel mixture intake, further contaminating the crankcase, increasing fuel consumption, and causing abnormal rail pressure.

10

3

Share

Is it acceptable if one side is wide and the other side is narrow in the reverse parking test for Subject 2?

In the reverse parking test for Subject 2, as long as the vehicle does not touch the solid line throughout the process, it is acceptable if one side is wide and the other side is narrow after parking in the garage. For example, one side being 25 cm and the other 35 cm, or one side 20 cm and the other 40 cm, are both acceptable. Although having one side wide and the other narrow does not result in point deduction, it may lead to some unnecessary operations, making the entire reversing process more complicated and harder to remember. If one side is too narrow and the other too wide, when exiting the garage and turning towards the narrow side, you must wait until the rear wheel of the narrow side reaches the corner of the garage before turning the steering wheel. If exiting towards the wide side, you can turn the steering wheel a little earlier, carefully observing the relationship between the wheel and the garage corner in the rearview mirror. If it is too close, you must adjust the steering wheel to the right, wait until the rear wheel passes, and then turn the steering wheel again to exit the test area.

7

5

Share

What Causes a Car Air Conditioner to Break Down?

What Causes the Keyless Entry Door Handle Button to Malfunction?

What are the requirements for the reverse parking test in Subject 2?

How are spark plug models classified?

Should the Positive or Negative Terminal Be Removed First When Disconnecting a Car Battery?

What are the causes of abnormal rail pressure?

Is it acceptable if one side is wide and the other side is narrow in the reverse parking test for Subject 2?

What are the symptoms of a damaged release bearing?

What is the correct way to jump-start a car with a dead battery?

What are the symptoms of a bad vehicle alternator?

How Many Days Does It Usually Take for the Archives to Be Mailed Out When Transferring a Used Car?