Beijing Hyundai brand new Tucson idle high maintenance?

A 20 15 Beijing Hyundai brand-new Tucson sport utility vehicle with a mileage of about 98,000 km, equipped with 1.6T in-cylinder direct injection engine and 7-speed powershift. User feedback: The car has a high idle speed, and the accelerator has been cleaned in other repair shops, but the fault has not been solved.

Inspection and analysis: after receiving the car, the maintenance personnel started the engine and found that the dashboard tachometer showed 1000 ~ 1200 r/min, and the idle speed was really high. With a scan tool, the engine system has a fault code "P0507-Idle speed is higher than expected". After clearing the fault code, start the engine again and the fault remains unchanged. The maintenance personnel suspected that the previous throttle was improperly cleaned, and the fault was still detected after re-cleaning.

The maintenance personnel sprayed the joints of the air intake system with cleaning agent to check whether there was any leakage in the air intake system, and no leakage point was found. Suspected that the high-pressure fuel pump is leaking oil, try to replace the assembly, and the idle speed is still high. At this time, the author intervened in the maintenance work. The author carefully looked at the data flow and found that the power generation of the generator was 83%, which was beyond normal. The car has not been modified, so it is judged that the generator is damaged internally.

Troubleshooting: Carry out trial operation and troubleshooting after replacing the generator.

Review and summary: this problem is relatively rare. Let's examine the principle of generator control by maintenance workers, that is, the function of adjusting idle speed. Behind any incurable disease is simple maintenance and improvement of understanding. As long as you keep learning and arming your own maintenance ideas, it will be easy to solve this kind of fault.