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What can be connected to the car OBD port?

1 Answers
LaDaisy
08/26/25 5:08am
OBD ports should not be connected to random devices. Since OBD is a diagnostic system extended for vehicle fault detection, external products may affect the vehicle itself through the OBD port due to their own malfunctions or issues. Here is more information about the OBD system: 1. Definition: OBD stands for On-Board Diagnostics, which translates to "on-board self-diagnosis system" in Chinese. The system continuously monitors the engine's operating conditions to check if the vehicle's emissions exceed standards. If they do, it will immediately issue a warning. 2. How it works: OBD connects various emission-related component information to the Electronic Control Unit (ECU). The ECU has the capability to detect and analyze emission-related faults. When an emission fault occurs, the ECU records the fault information and related codes, and alerts the driver via a warning light. The ECU ensures access and processing of fault information through a standard data interface.
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What does it mean when the parking light fails?

Parking light failure refers to a malfunction of the brake lights. The causes of parking light failure are: 1. Faulty brake light bulb; 2. Damaged brake light fuse; 3. Defective brake light switch; 4. Wiring issues; 5. Not pressing the brake pedal. Solutions for parking light failure include: 1. Replacing the brake light bulb; 2. Replacing the brake light fuse; 3. Replacing the brake light switch; 4. Checking for short circuits in the wiring. Characteristics of parking lights are: 1. High switch durability; 2. Good resistance to vibration and impact; 3. Long lifespan, maintenance-free, and low energy consumption; 4. Strong light penetration; 5. High luminous intensity and reasonable light distribution.
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What engine does the Murano car use?

The Murano car is equipped with a 2.5L naturally aspirated engine. The function of the engine is to convert the thermal energy of gasoline or diesel into mechanical energy by burning and expanding the gas in a sealed cylinder, thereby pushing the piston to perform work. Taking the 2021 Murano as an example, its body dimensions are: 4897mm in length, 1908mm in width, and 1691mm in height, with a wheelbase of 2830mm. The fuel tank capacity is 72L, the trunk capacity is 535L, and the curb weight is 1656kg. The 2021 Murano features a MacPherson strut independent front suspension and a trailing arm semi-independent rear suspension. It delivers a maximum horsepower of 175ps, a maximum power of 104kw, and a maximum torque of 235mm, paired with a 6-speed manual transmission.
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What are the methods to quickly remove odors from a new car?

Methods to quickly remove odors from a new car include: 1. Opening the windows for ventilation; 2. Turning on the internal air circulation; 3. Placing activated charcoal inside the car; 4. Installing an air purifier in the car; 5. Turning on the external air circulation of the air conditioning; 6. Placing citrus peels, such as grapefruit or orange peels, inside the car to counteract odors with their natural fragrance; 7. Applying photocatalytic coatings to eliminate odors. The causes of car odors are: 1. Overheated wires or short circuits in electrical devices; 2. Dirty air conditioning filters or air ducts; 3. Damaged fuel tanks or leaks in the fuel supply system; 4. Burnt clutch plates or failure to release the handbrake; 5. Decaying materials or debris in hard-to-reach areas inside the car producing odors.
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How to Operate the One-Button Start in a Geely Manual Transmission?

Geely New Emgrand is equipped with an electronic keyless start/one-button start switch, which is a push-button start. For the system to operate, the remote must be inside the vehicle. OFF: This position turns the engine off. When the start switch is in the OFF power mode, press the clutch pedal (MT) or brake pedal (CVT), the indicator light turns green, and press the start button once to directly start the vehicle. Additional relevant information is as follows: 1. ACC (Orange Light): This position allows you to use electrical accessories such as the radio and windshield wipers after the engine is turned off. When the engine is off, pressing this button once without pressing the clutch pedal (MT) or brake pedal (CVT) will place the start switch in the ACC position. When the start switch is in the ACC power mode, press the clutch pedal (MT) or brake pedal (CVT), the indicator light turns green, and press the start button once to start the vehicle. 2. Precautions: If the start switch remains in the ACC position after the engine is turned off, it can drain the battery. If the battery is drained for too long, it may not be possible to start the vehicle. ON (Orange Light): When the start switch is in the ACC position, pressing this button once without pressing the clutch pedal (MT) or brake pedal (CVT) will place the start switch in the ON position. Pressing the button once more will return the start switch to the OFF position. START: This position is used for driving and starting the vehicle. When the engine is off, press the clutch pedal (MT) or brake pedal (CVT), press and release the button, and the engine will start. When the start switch is in the START position, the engine will continue to start until the engine begins to operate.
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Reasons for the ABS Light Illuminating in the Sylphy and How to Troubleshoot

There are various states in which the ABS light may illuminate, with different causes and solutions for each state, as detailed below: State 1: ABS warning light stays on (most common). Cause 1: The ABS speed sensor's sensing part is covered by dirt, mud, or other contaminants, affecting its ability to detect the corresponding speed signal. This prevents the ABS computer from determining the vehicle's speed and the wheel's slip rate, thus failing to issue appropriate commands to regulate braking. Solution: Clean the dirt from the speed sensor and adjust the gap between the sensor and the signal ring to restore normal function. Cause 2: Poor signal quality due to loose connections in the system wiring or poor contact in the ABS relay, leading to system failure. Solution: Inspect wiring connections and reconnect any loose parts. State 2: ABS warning light intermittently illuminates but turns off when accelerating. Cause: When multiple vehicle electrical devices are in use, the battery voltage drops below 10.5V. The ABS light turns off as the engine speed increases and voltage rises. This may also occur if the ABS system's power supply voltage is too low due to 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 and only turns off when the engine is turned off (IGFF). Cause: Poor grounding contact in the ABS hydraulic valve body; poor contact in the ABS hydraulic valve body's wiring connector; ABS computer failure. Solution: Loosen and retighten the grounding screw on the hydraulic valve body, cleaning the contact surface if necessary; check if the connector gap has widened; replace the ABS or ABS/ASR computer. State 4: ABS warning light illuminates during high-speed driving. Cause: During high-speed driving, the ABS computer detects a significant discrepancy between the rear and front wheel speed signals; 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 intermittently illuminates. 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 down fully, 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. An illuminated ABS light indicates a malfunction 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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What is the reason for the eco light on the dashboard?

The reason the eco light on the dashboard is illuminated is to indicate that the vehicle has entered the economy mode. Eco is the car's economical driving mode, which reminds the driver to drive in an appropriate manner. When the optimal fuel supply is achieved, the dashboard will simultaneously display the green eco indicator. If the accelerator pedal is pressed hard for acceleration or when encountering uphill sections, the eco indicator will disappear. The main principle of the eco mode is to comprehensively judge and analyze conditions that affect fuel consumption during vehicle movement, such as automatic transmission gear, engine speed, vehicle speed, braking, and transmission oil temperature. The eco control unit calculates the fuel quantity to be supplied to the engine for operation, effectively reducing fuel consumption compared to normal driving mode.
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