How to repair a car without power? Popular topics and solutions on the Internet in the past 10 days
Recently, car circuit failures have become one of the hot topics discussed by car owners, especially the frequent problem of "vehicle no power". This article combines popular discussions and technical analysis across the Internet in the past 10 days to sort out structured solutions to help car owners quickly troubleshoot faults.
1. Hotspot data on automobile circuit faults in the entire network in the past 10 days
| Ranking | Popular questions | Amount of discussions (articles) | Main cause of failure |
|---|---|---|---|
| 1 | Battery out of power | 12,800+ | Battery aging/forgetting to turn off electrical appliances |
| 2 | blown fuse | 9,300+ | Circuit short circuit/overload |
| 3 | Ignition switch failure | 6,500+ | Mechanical wear/poor contact |
| 4 | Wiring harness corrosion | 4,200+ | Wading/oxidation |
| 5 | Generator failure | 3,700+ | Worn carbon brushes/damaged voltage regulator |
2. 5-step troubleshooting method for car without power
1. Check battery status
• Use a multimeter to measure the voltage (normal value: 12.6V or more)
• Observe whether the electrode is corroded (white-green crystals need to be cleaned)
• Try to start with power (pay attention to the order of positive and negative poles)
2. Check the fuse box
• Locate mains fuse (refer to vehicle manual)
• Visual inspection for signs of fusing (blackening/metal breakage)
• Common locations: left side of cockpit/engine compartment
3. Test the ignition switch
• Observe the instrument light when turning the key to the ON position
• Use a test lamp to test the switch output
• Typical symptoms: abnormal noise in the steering column
4. Check the main relay
• Locate the power distribution relay box
• Replace the relay of the same model for testing
• Key inspection: EFI main relay
5. Diagnose wiring harness problems
• Check the engine compartment wiring harness connector
• Check the ground wire resistance (should be less than 0.5Ω)
• Note: Wiring harness repair requires professional equipment
3. Fault characteristics of different models (case statistics in the past 10 days)
| Vehicle type | High frequency fault point | Repair cost reference |
|---|---|---|
| German cars | The power management module is damaged | 800-2500 yuan |
| Japanese cars | Battery pile head loose | 0-200 yuan |
| American cars | Ignition switch assembly failure | 400-1200 yuan |
| New energy vehicles | Small battery is out of power | 300-800 yuan |
4. Self-rescue skills for car owners (popular short video recommendations)
1.emergency activation method: Use a metal tool to short-circuit the starter relay (older models only)
2.Power off reset method: Disconnect the negative terminal and wait for 10 minutes to restore the ECU.
3.Anti-theft release: Try turning the key on and off 3 times to release the anti-theft mode.
5. Maintenance suggestions
•Basic troubleshootingCan be done by yourself (battery/fuse)
•complex failureIt is recommended to use an OBD diagnostic tool to read the fault code
•emergencyCall your insurance company for roadside assistance (most include free calls)
Note: Due to recent heavy rains, the number of inquiries about circuit faults of vehicles involved in water in Guangdong, Fujian and other places has increased by 40% year-on-year. It is recommended to check the line waterproof cover in time after wading in water.
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