Here H685 can test and erase the car trouble codes and read the relative trouble codes. On the other hand, many mechanical problems, such as poor engine performance due to low fuel level, damaged soft cube, electrical wire or electrical connectors, can also cause faked trouble codes. Therefore you need to refer to the car service pamphlet to get more instruction information when you test before you know the mechanical problems 1. Function • TROUBLESHOOT • DATA LIST • CLEAR • FUNCTION TEST • ECM RESET 2. Systems supported H685 can support the following systems: • PGM_FI   • AT • ABS_VSA • SRS • EPS 3. Appearance and Key Descriptions   The appearance of a H685 is as shown in the above figure.  1). LCD screen: 128*64  2). Enter key:  confirm selection and enter  3). Esc key:   go back to the previous screens  4). up/down arrows:  moves the selection pointer and scrolls up or down   5). LEFT/RIGHT arrows:  move cursor.  6). Power button  7). Diagnostic extension cable:  OBDII -16PIN / HONDA 3PIN 1.PayPal only(accept credit card to pay by credit card via paypal). 2.usually items will be shipped the same day as payment received. 3.Worldwide Express Mail or standard air mail shipping, please allow about 5-25 days for shipping time. 4.We do offer combined shipping.                                                     Refunds: The full purchase price less the Shipping & Handling will be refunded upon return of the item. if shipping was free, The refund will be the full purchase price less the shipping cost. the item must be returned undamaged in the original packaging.           Faulty items: If your item arrives faulty, we will exchange it for a replacement. if you prefer a refund. the full purchase price less the Shipping & Handling will be refunded upon its return. if shipping was free, the refund will be the full purchase price less the shipping cost.           We make every attempt to answer your technical questions. we provide full documentation & troubleshooting for most of our items. we also can refer you to a seller who will sell the same or similar products with tech support.