What are the solutions for automotive CAN communication faults?
4 Answers
Automotive CAN communication faults can be resolved by: 1. Observing specific fault symptoms and conducting preliminary analysis of the causes based on these symptoms; 2. Using relevant diagnostic equipment for diagnosis and formulating corresponding repair plans according to the diagnostic results; 3. Identifying the specific fault location and cause, while combining appropriate detection methods and measurement results to locate the fault point for troubleshooting. The causes of automotive CAN communication faults include: 1. Faults caused by the vehicle's power system; 2. Faults in the CAN bus system's link; 3. Issues with the nodes of the CAN bus system.
The other day my car had a CAN communication failure, with warning lights flashing erratically on the dashboard and difficulty starting. I first checked the CAN wiring harness connectors in the engine bay myself and found them loose, but tightening them didn't fix the issue. Then I used an OBD-II scanner connected to a mobile app to read the fault codes, which indicated a short circuit. Eventually, I discovered that rainwater had seeped in and corroded the connectors. After cleaning them thoroughly and applying some anti-rust agent, the problem was resolved. Regular driving advice: periodically check the engine bay's sealing to prevent moisture damage to wiring, as the CAN system controls critical components like the engine and transmission. Driving with such faults can be dangerous, and delayed repairs might lead to roadside breakdowns. Pro tip: don't rush to replace modules—start troubleshooting with simple checks first.
When encountering a CAN communication failure, my troubleshooting steps are: First, turn off the engine and wait a few minutes for the system to reset, then power it back on to see if the symptoms disappear. If the issue persists, use a basic diagnostic tool to read the specific error codes—most faults can pinpoint the location, such as a bus short circuit, open circuit, or module failure. Next, check if the fuses are blown and whether the wire connectors are loose or corroded. Simple issues can be fixed on your own, but more complex problems like module failure require a professional repair shop. For prevention, pay attention to cleaning dust and stains around the CAN lines during maintenance to prevent rust and wear. CAN failures affect critical functions like the ABS braking system, so quick action is essential for safety. Never delay or take it lightly.
My car previously had CAN communication issues, causing sluggish acceleration. I first manually inspected the CAN bus connectors in the engine bay, terminal resistors, and fuses—found no problems, so I bought a Bluetooth diagnostic adapter to check fault codes via my phone, which located a short circuit in the wiring harness. I then repaired the corroded connector points. The whole process took half an hour, saving money compared to going to a repair shop. For daily maintenance, it's recommended to perform regular checks and avoid driving on dirty roads. Safety first—never force the car to operate when there's a malfunction.
