Subject 5 Exam Content and Passing Standards?

What are the differences between BMW 1 Series and 3 Series?

Differences between BMW 1 Series and 3 Series: different power, different body size, different drive forms. Different power: BMW 1 Series is equipped with a 2.0t turbocharged engine, with a maximum power of 192ps and a maximum torque of 280nm; BMW 3 Series is equipped with a 1.5t three-cylinder turbocharged engine, with a maximum power of 136ps and a maximum torque of 220nm. Different body size: In terms of body size, the latest BMW 1 Series has a length, width, and height of 4462x1803x1448mm, with a wheelbase of 2670mm, while the new BMW 3 Series has a length, width, and height of 4829x1827x1463mm, with a wheelbase of 2951mm. It can be seen that the body size difference between the two cars is still significant. Different drive forms: At the same time, in terms of drive forms, the BMW 1 Series adopts a front-engine front-wheel-drive form, while the BMW 3 Series adopts a front-engine rear-wheel-drive form. In addition, in terms of front suspension structure, the BMW 1 Series adopts a conventional MacPherson independent suspension, while the BMW 3 Series i adopts a double-joint spring strut front axle, which emphasizes more on sports handling.

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Is It Necessary to Install an Engine Guard Plate for a Car?

Whether to install an engine guard plate for a car depends on the usual road conditions. It is unnecessary to install one when driving in urban areas or on relatively flat roads. However, if you frequently engage in outdoor activities and drive on bumpy or muddy roads, installing an engine guard plate is advisable. Advantages of installing an engine guard plate: Extends engine lifespan: With an engine guard plate installed, the engine is shielded during driving. Even on poor road conditions with potholes or excessive gravel, the engine's working environment remains protected, eliminating any concerns. Protects the chassis: The engine guard plate not only safeguards the engine but also provides protection to the front part of the chassis. Without a guard plate, driving on roads covered with gravel or mud can easily lead to chassis scrapes. In rainy or snowy weather, contact between the chassis and rain or snow may also cause corrosion from de-icing agents or asphalt. Reduces maintenance costs: Installing an engine guard plate can extend the intervals between maintenance sessions. For example, if a car's official manual recommends maintenance every 10,000 kilometers, the maintenance cycle can be prolonged due to the improved working environment of the engine. Reduces fuel consumption: After installing an engine guard plate, the car's chassis becomes smoother. This prevents the formation of turbulent airflow underneath the car, thereby reducing wind resistance and saving fuel.

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How many liters of engine oil should be added to the Buick Excelle?

The Buick Excelle requires approximately 4L of engine oil during an oil change. After adding the oil, you should check the oil dipstick to confirm the exact amount. Oil dipstick scale standards: To determine whether the amount of oil added is sufficient, check the oil dipstick after adding the oil. The dipstick has two marks: a maximum and a minimum. The correct oil level should not exceed the maximum mark or fall below the minimum mark; it should be between these two marks. How to check the oil level: After adding the oil, start the vehicle and then turn it off. Wait for 3 minutes before checking the oil level. This is because the oil filter is also replaced during an oil change, and the new filter initially contains no oil. After starting the vehicle, oil flows into the filter. Waiting 3 minutes allows the oil to settle back into the oil pan, ensuring a more accurate reading. Do not check the oil level on a slope, as the tilted position of the vehicle will cause the oil in the pan to tilt as well, leading to an inaccurate reading. Always ensure the dipstick is held perpendicular to the ground for the most accurate measurement.

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Where to Add Water to the X-Trail's Radiator?

The X-Trail's radiator is located in the engine compartment, next to the windshield washer fluid reservoir. The car radiator generally refers to the car's cooling system radiator, which is part of the engine's liquid cooling system. The radiator in the engine's liquid cooling system consists of three parts: the inlet chamber, outlet chamber, main plate, and radiator core. The method for adding water and coolant to the X-Trail's radiator is as follows: 1. With the car engine cooled down, unscrew the radiator cap, open the radiator drain valve, and drain the coolant. 2. Insert a rubber hose connected to a tap into the radiator filler port, turn on the tap, and let tap water continuously flow through the engine cooling system. During this flushing operation, keep the engine idling and continue until clear water comes out of the radiator. 3. Turn off the tap, wait for the cooling system to drain completely, then close the radiator drain valve. 4. Add coolant from the radiator filler port until the radiator is full. Unscrew the reservoir cap, add coolant up to the 'Max' mark, being careful not to exceed it. 5. Replace and tighten the radiator cap and reservoir cap. 6. Start the engine and let it idle for 2-3 minutes, then unscrew the radiator cap. At this point, as some air has been expelled from the cooling system, the coolant level will drop. Add more coolant until it reaches the 'Max' mark. 7. Securely fasten the radiator cap.

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What Causes the Half Shaft Oil Seal of the Prado to Leak?

The reason for the half shaft oil seal leakage in the Prado is excessive oil filling in the drive axle reducer, causing the oil level to exceed the normal height. Specific causes of half shaft oil seal leakage: Deterioration and aging of the oil seal leading to reduced sealing effectiveness. Improper installation of the oil seal, resulting in gaps. Blockage of the drive axle reducer vent hole; during driving, the oil temperature rises, pressure increases, and oil is forced out, damaging the oil seal. Poor quality or incorrect dimensions of the half shaft oil seal, or loose installation between the oil seal and the half shaft sleeve. Loose wheel hub bearings or drive axle reducer bearings causing the half shaft to shake up and down. Wear of the half shaft journal leading to poor sealing. Hazards of half shaft oil seal leakage: Oil leakage from the half shaft oil seal reduces the amount of lubricating oil in the drive axle, affecting normal lubrication and accelerating wear of components, leading to premature failure. Oil leakage from the half shaft oil seal allows lubricating oil to flow into the wheel-side reducer, raising the oil level in the wheel-side reducer, which can damage the oil seal and flow into the brake drum, resulting in poor braking performance and posing a safety risk.

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Where is the starter relay located in the Buick Excelle?

The starter relay of the Buick Excelle model is located in the engine compartment fuse box, at the connection point between the engine and the transmission. Introduction to relays: A relay is an electrical control device that causes a predetermined step change in the controlled quantity in the electrical output circuit when the change in the input quantity (excitation quantity) reaches the specified requirements. Function of relays: Relays establish an interactive relationship between the control system (also known as the input circuit) and the controlled system (also known as the output circuit). They are commonly used in automated control circuits, essentially acting as an "automatic switch" that uses a small current to control the operation of a larger current. Therefore, relays play roles in automatic regulation, safety protection, and circuit switching within electrical circuits.

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Subject 5 Exam Content and Passing Standards?

What are the differences between BMW 1 Series and 3 Series?

Is It Necessary to Install an Engine Guard Plate for a Car?

How many liters of engine oil should be added to the Buick Excelle?

Where to Add Water to the X-Trail's Radiator?

What Causes the Half Shaft Oil Seal of the Prado to Leak?

Where is the starter relay located in the Buick Excelle?

Is the Sportage equipped with a manual-automatic transmission?

What causes the exhaust pipe noise in Besturn B50?

Will the Electronic Eye Capture Crossing a Single Yellow Line?

What is the reason for the Buick Excelle's reversing camera not displaying?