First,to understand the relationship between the node jumper box and select the vehicle type diagnosis

1#:K line; 2#:K line;3#:K line; GND:Ground wire(negative);6#:CAN‐H;7#:RSR232+, J1708+, K line;8#:K line;9#:K line; 10#:K line;11#:K line; 12#:K line;13#:K line; 14#:CAN‐L;15#:RSR232‐, K line, J1708‐, L lineVCC: power line(Positive); POWER:Power indicator.Remark: If lack of vehicle electrical equipment knowledge or unable to confirm electrical equipment power supply, please don’t operate jumper, for error operation of jumper may lead to malfunction of electrical failure or FCAR F3-D main unit and wire.                                                           [image]Pic. 4‐39  (Auto diagnostic socket related information reconfirmed as below)● Digital high impedance multimeter (can not use Analog Multimeter)● When ignition switch to ON Gear, there is supply voltage of vehicle on diagnostic socket. Voltage difference between voltage on diagnostic socket and vehicle battery side can not be above 2.5V. In diagnosis, if the signal line used is single-line communication (K line), voltage on signal line lower than battery voltage,(if vehicle supply voltage is 12V,then voltage on signal line is 11V, + 0.25V;if 24V,signal voltage is 21V,+ 0.25V)If double signal line adopts CAN communication, 2 diagnostic lines use multimeter to measure ground wire voltage under the condition that ignition switch open, the sum of both voltages is 5V,average 2.5V,the one voltage little higher than 2.5V is CAN-H, the one voltage lower than 2.5V is CAN-L.  After understanding of the above, then you can use auto scanner to read DTC. Now make a brief introduction of operation steps for FCAR scanner to read DTC: Confirm diagnostic socket connect properly and then turn on power switch of scanner, and select Diagnostic menu (As shown in Pic.4-39).  11、Select vehicle type to be diagnosed:●Diesel●Machine  Select vehicle type and then enter into vehicle series or engine select menu (as shown in 4‐40):Then enter into engine type or electronically controlled system menu (As show in Pic. 4‐41)After entry to engine type or electronically controlled system menu, it will shows function menu of scanner (As show in Pic. 4‐42)[image]                               [image]           Pic.4-40 model or engine menu                                                                   Pic.4-41 ECU menu  If need to clear DTC saved in ECU memory, then must select “Clear DTC” menu option. At present, all Electronic Control Systems are required to use this method. Some first generation of Electronic Control System can clear saved DTCs by way of using scanner or dismantling ECU power fuse for 10s and then install. The shortcoming of this kind of system is all DTCs appeared and recorded in the process of driving will disappear once driver cleared DTCs, therefore maintenance technician and fleet maintenance manager would know nothing about the problem of engine and vehicles.Note: Before clearing DTC, better write down DTCs, also can use printing function of Fcar scanner.[image]Pic.4‐42 Function select menu  

State of Data Acquisition

By Gary McCoy, Fairway Communications Mike Bailey is the owner of Car Doctor, a repair shop in downtown Oklahoma City. The shop is located in an area of the city that is rapidly changing and not far from the arena where the NBA’s Oklahoma City Thunder plays. Car Doctor dates back to 1983, and Bailey has owned the shop since 1995. Car Doctor is a NAPA AutoCare shop that offers complete automotive maintenance and repair for both foreign and domestic. Car Doctor does everything from oil changes to engine replacement.  Bailey has been involved in the leadership committee of the Car Care Professionals Network at the Auto Care Association and has been an L1 Certified ASE Master Technician for over 25 years. When I talked with Bailey earlier this summer about issues facing today’s shop owners, inevitably the issue of data acquisition came up. I asked Bailey how is shop is doing in getting the data they need to repair today’s increasingly complex, computer-controlled vehicles.  
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