What Are the Reasons Why the Ignition Device Cannot Start the Engine?
4 Answers
The reasons why the ignition device cannot start the engine are as follows: 1. The battery cannot hold a charge: If the vehicle has no power after being parked for just 1 day, aside from the battery's own sulfation (which prevents charging), it may be due to a leakage in the vehicle's wiring harness. 2. Short circuit in the coolant temperature sensor: If the engine fails to start after multiple attempts and the spark plug electrodes are very clean, it may be due to a short circuit in the coolant temperature sensor. 3. Clogged fuel filter: While driving, the vehicle's speed suddenly drops and continues to decrease until the engine stalls. After stalling, restarting may allow the engine to start, but the speed remains very low, and the engine cannot maintain operation, eventually stalling again and failing to restart. 4. Anti-theft system lock: When the anti-theft system is locked, the steering wheel cannot be turned, and the anti-theft indicator on the dashboard lights up. The control unit will interrupt fuel supply control but not the ignition. The engine cannot start, indicating that the steering wheel and ignition switch are locked by the central control. Applying force to rotate the steering wheel until it moves will cause the anti-theft system to automatically unlock, allowing normal startup.
I remember last time when I was out traveling, my car suddenly wouldn't start, which was quite unsettling. I quickly checked it. Common ignition issues may include a dead battery, especially in winter or after prolonged parking, as the battery can easily drain; there could also be a starter or motor malfunction, making clicking sounds but failing to turn over; dirty or poor contact in the ignition switch may require cleaning; loose or aging wiring can cause unstable current; safety lock issues are also common, like automatic transmission cars not starting if not in P mode. It's advisable to first check if the dashboard lights come on—if they do but the engine doesn't respond, you might need to try replacing a fuse or use professional tools for inspection. Regular battery maintenance is recommended, avoiding long-term parking in extreme weather, and it's best to keep an emergency power source in the car for critical moments.
As a frequent driver, I believe the most common cause of ignition failure is battery issues. Aging batteries with reduced capacity or corroded terminals can cause difficulty in starting. Sometimes, the starter motor may get stuck or wear out, producing slight abnormal noises without engaging. Wiring problems, such as loose connections or short circuits caused by rainwater infiltration, are also quite common. Worn internal contacts in the ignition switch can also lead to malfunctions. Don't forget about gear issues—automatic transmissions not in P mode or manual clutches not fully depressed can prevent starting. For simple diagnostics: first, listen for clicking sounds—if absent, the battery or wiring may be faulty. Then, check if the key is properly inserted, and use a multimeter to measure voltage if necessary. Regular cleaning of the engine compartment and periodic part replacements can significantly reduce such troubles.
Ignition failure often stems from component aging, such as insufficient battery capacity or corroded terminals after years of use; worn starter gears preventing the motor from turning; corrosion or loosening of ignition system wiring affecting current flow; or poor contact in the switch itself or a faulty safety lock. Prevention is key—annual battery checks and ensuring secure connections can effectively avoid these issues.
