What Causes a Car to Fail to Shut Off?

1 Answers
DiCassidy
07/29/25 9:51pm
When a car cannot shut off, it is generally due to an electrical circuit malfunction and requires repair at a service station. The specific reason is that the engine control unit (ECU) continues to operate even after the ignition key is turned off, with power being supplied through other circuits. Possible causes include a short circuit to ground or the live wire, or a PCM relay that remains closed due to mechanical reasons. Below is additional information: Introduction: A relay (English name: relay) is an electrical control device that causes a predetermined step change in the controlled quantity in the electrical output circuit when the input quantity changes to meet specified requirements. It establishes an interactive relationship between the control system (also known as the input circuit) and the controlled system (also known as the output circuit). Typically used in automated control circuits, it essentially functions as an "automatic switch" that uses a small current to control the operation of a larger current. In circuits, it plays roles such as automatic regulation, safety protection, and circuit switching. Applications: Relays are automatic switching components with isolation functions, widely used in remote control, telemetry, communication, automatic control, mechatronics, and power electronic equipment, making them one of the most important control components.
Was this review help?
13
2
Share
More Forum Discussions

What is the difference between Bond Fujita and Fujita?

The differences between Bond Fujita and Fujita are as follows: Different products: Fujita: Fujita mainly sells bicycles as its primary product. Bond Fujita: Bond Fujita's business scope includes the manufacturing of electric bicycles, electric tricycles, bicycles, and their components. Different founding times: Fujita: Fujita was established on August 18, 1994, and registered with the Dongli District Market and Quality Supervision Administration in Tianjin. Bond Fujita: Bond Fujita was registered and established on February 11, 2015, with the Jinghai District Market and Quality Supervision Administration in Tianjin. Different sales channels: Fujita: Fujita's products are exported to regions such as the United States, Europe, Japan, South Korea, Taiwan, and Southeast Asia. Bond Fujita: Bond Fujita's products are mainly sold in mainland China.
15
4
Share

What does sp0rt mean?

SPORT on a car refers to the sport mode, which is one of the various driving modes available in vehicles, also known as SPORT mode or S gear sport mode. In sport mode: The transmission can shift freely, but the shift timing is delayed, keeping the engine at higher RPMs for a longer period. This allows the car to operate at lower gears with higher RPMs for an extended time, resulting in greater torque output and acceleration. Disadvantages of sport mode: While the advantages of sport mode provide exciting performance enhancements, it masks the downsides of increased engine power: potential reduction in fuel mileage.
13
0
Share

Is Car Oil Leak Dangerous?

Car oil leakage is very dangerous. Cars are flammable and explosive items, and oil leakage can easily lead to explosion hazards. Causes of oil leakage: It is generally caused by damage to engine cylinder gaskets, oil pan gaskets, sealing rings, or damage to crankshaft front and rear oil seals, camshaft oil seals, or loosening of various fastening screws. Parking inspection may reveal oil seepage, and in severe cases, the reduction in oil volume is quite noticeable, with a large amount of oil accumulating on the engine guard plate. Hazards of oil leakage: The amount of oil is closely related to car performance. Too little oil can easily cause bearing burning, cylinder scoring, and in severe cases, it may lead to crankshaft breakage and cylinder block damage. Too much oil can affect the car's power, and excessive oil can also easily cause oil channeling and oil burning. Therefore, oil should be added according to the standard that matches the car model and the driving environment. The correct type of oil must be used without any mistakes.
9
1
Share

Can You Drive on the Road with an Expired Driver's License?

You cannot drive on the road with an expired driver's license. You need to renew your driver's license before you can drive legally. Documents required for renewing a driver's license: Original driver's license of the driver; ID card and photocopy of the driver; Physical examination certificate issued by a county-level or above medical institution or a military medical institution; Three one-inch personal photos of the driver. Fill out the "Motor Vehicle Driver's License Application Form" at the vehicle management office, and submit it along with the above documents to the relevant window for processing. Services provided by the vehicle management office: The vehicle management office is mainly responsible for handling motor vehicle registration, modification, transfer, mortgage, and cancellation, as well as driver's license application, replacement, renewal, verification, and other related services for motor vehicles and drivers.
5
3
Share

What Aspects Should Be Considered When Choosing a Car?

Choosing a car should start with safety, stability, fuel consumption, appearance, and resale value. Safety: Without safety, a car is like a bomb, and no one wants to live with a bomb. Regarding car safety, there are mainly two aspects: active safety and passive safety. Active safety includes the vehicle's driving safety systems: ABS, EBD, ESP, tire pressure monitoring, radar systems, etc. Passive safety includes the body structure frame, airbags, seat belts, etc. Every safety device in the car is important, so make sure to check them carefully when choosing. Stability: Even with safety, if the car requires frequent minor repairs every three days and major repairs every five days, no one can handle it—even if it's free, no one would dare to take it. Therefore, stability is what everyone needs. More stable performance ensures longer usage and helps save costs. Fuel Consumption: For ordinary people, although the difference in fuel consumption may not be huge, it adds up over time to a significant expense. Thus, it's better to choose a model with low fuel consumption to reduce daily costs. Appearance: An ugly appearance can affect your mood, and you might even feel embarrassed to drive it out. Resale Value: Life is too long to stick with one car forever; you'll likely switch cars a few times in between. Trying out different types of cars is part of the experience, so you must consider the car's resale value in the used car market. No one wants to buy a car at a sky-high price only to sell it for peanuts—it’s frustrating. Moreover, in the market, cars with high resale value usually have a large ownership base, indicating that their performance stability is widely recognized. Therefore, resale value is also a strong indicator of a car's quality.
7
4
Share

How many days can a new car be driven without a temporary license plate?

New cars cannot be driven for even a single day without a temporary license plate. The use of a temporary license plate for a new car must not exceed 15 days. Introduction to Temporary License Plates: A temporary license plate is a paper motor vehicle license plate that permits temporary road use of a motor vehicle, also known as a temporary vehicle movement license plate. It refers to the temporary vehicle movement certificate issued by the vehicle management department of the public security bureau before the new vehicle is officially registered. Procedures for Applying for a Temporary License Plate: The applicant must hold a unit introduction letter, vehicle origin certificate, qualification certificate, and other relevant documents (except for the introduction letter, which is archived, the rest are returned to the applicant) and apply at the vehicle management office. During the application, the starting and ending locations of the vehicle's movement and the duration of the temporary license plate use must be specified.
19
2
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.