By 2020, new energy vehicles to achieve industrialization, energy-saving and new energy vehicles and key parts technology has reached the international advanced level load cargo electric tricycle, pure electric vehicles and plug-in hybrid vehicle market population reached 5 million. Analysis and forecasting, from 2012 to 2015, China's average annual growth rate of the market electric car sales will reach about 40%, most of which comes from a pure electric car sales by 2015, China will become Asia's largest electric car market. Electric car fault diagnosis are the following nine direction: 5) How to detect brake handle 20 volts with a multimeter to measure the voltage profile controller nine-pin plug, black pen means thin black line refers to the fine red pen purple line voltage? show about 6 volts, zero is always off the brake factory direct electric tricycle, hold about brake handle, then multimeter should show zero voltage constant uninterrupted power to the brake. 6) How to Detect A brushless controller power tube damage detection:? Power Tube bad performance of the vehicle does not turn or phase, specific measurement methods: measuring diode controller files A, B, C three-phase motor wiring multimeter black pen then power red, red pen, respectively, then the three-phase motor phases, multimeter significant value should be around 500-600, if a test result is zero or very small relative to the display, the phase of the power transistor breakdown If the show is a great circuit; multimeter red pen then the power ground, black pen, respectively, then the three-phase motor phase electric tricycle cargo, multimeter display value should be around 500-600, if the display is zero or very small electric tricycle , the next phase of the tube power breakdown, if the show is a great disconnect power tube B in case the power is turned on, the controller with a multimeter voltage profile measurements nine core plugs Thin Red Line and thin black lines, to see whether the voltage in 5 volts, as there is no voltage, the controller bad. Electric tricycle manufacturers to provide, White Dragon machinery (certified), electric tricycle provided by 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.