Car Diagnostic Tool FAQ--UOBD2

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How to detect Auto GND badness?

posted by Chasen on Jun 23, 2017 under Car Diagnostic Tool
tags: Launch X431 Autel MS906P

01 starter operation, if the battery grounding wire temperature is too high, even at the end of the phenomenon of red on the ground, indicating that the battery grounding wire contact bad.X431 Tool 02 in the case of non-charged measurement of the resistance value of the ground point, that is, with a multimeter of a table pen reliably connected to the wire, Yanhua Digimaster 3 another pen and metal parts of the body connected to measure the resistance between them, if there is resistance, The VXSCAN EL-50588 03 using simulated vibration method. For the suspected parts, you can in the vertical direction and horizontal direction gently shaking the line, to simulate the state of TOYO KEY OBD II vibration when driving the car, while observing the reaction of the relevant parts to determine whether the ground with Weld, loose, poor contact or wire break phenomenon.Autel MS906  04 When the circuit is energized, the voltage drop of the tapping point is measured with a multimeter. The reading should be as low as possible (close to 0). The method is to start the engine,Xhorse Condor XC-002 the use of multimeter DC voltage block, the red pen touch the consistent. If the Autel MS908P former value is large, the latter value is small, a difference of 0.5V or more, indicating the existence of more than 0.5V voltage drop, it is by the engine body and the frame caused by bad grounding.

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