According to industry forecasts, to 2012, the electric bicycle market will reach 100 billion yuan, while the only electric vehicle battery market potential of more than $ 50 billion. In the March 18, 2011, four ministries jointly issued "on the strengthening of the management of electric bicycles notice", but eventually become a "dead letter." Passenger three-wheeled electric car manufacturers means that the electric car industry in the long-term trend good environment is facing a huge market pressure to survive, the policy limits will become a large business survival pending a sword; and the external environment, weak international economic environment, weak recovery, but also makes the electric car export bonus will be greatly reduced. In electric vehicles, "energy-saving and new energy automotive industry development plan" submitted to the State Council has made it clear, "plan" has been elevated to the national strategic level of well-known manufacturers of electric vehicles, the automotive industry new office is designed to be arranged. As one of the countries identified seven strategic emerging industries, the new energy vehicles amounted to 100 billion yuan investment will be in the next 10-year plan, the sales scale lock in the world. Electric car fault diagnosis are the following nine direction: 3) How to Detect A brushless motor and the motor harness plug unplug all with a multimeter diode file, the multimeter red needle means six-pin plug on the motor thin red line, black? Fine needle means yellow, blue, green and black lines of electric vehicles manufacturers, numerical display of 900 or more, the red needle means black line refers to the fine needle black yellow, blue, green and red, numerical display 500 -600. Display zero or infinity is bad. The B-energized state, with a multimeter 200 volt DC voltage profile, black six-pin connector pin means thin black line, refer to the fine red needles yellow, blue, green line, the rotation of the motor, the voltage display of 0-6.25 V between changes. Maximum and minimum three wires should be less. 4) How to detect turn to? 20 volts with a multimeter to measure the voltage profile controller nine-pin plug, black pen means thin black line, red pen refers to the fine yellow line, then the voltage should be about 1 volt electric car Closed manufacturers, will be transferred to the turn in the end, the multimeter displays a volt to 4.2 volts or 4.8 volts, then turn to be good. Electric car manufacturers ranking _ White Dragon Machinery (certified) provided by the manufacturer of electric vehicles _ White Dragon Machinery Co., Ltd. Shandong. White Dragon Shandong Machinery Co., Ltd. (www.bailonggrp.com) Shandong Linyi, bicycles, tricycles and accessories leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In the White Dragon machinery leadership with the staff warmly welcome all inquiries negotiations to create a better future for White Dragon machinery.