LAUNCH X431 GDS Sensorbox Manual
17
z At first check the fuse, fusible line and connection port. Then check
others after eliminating these faults.
z When measuring voltage, the ignition switch should be turn on and the
battery voltage should not be less than 11V.
z When measuring voltage, please shake the lead lightly in the vertical
and level direction for much precision.
z When checking whether there is open in the line , at first disconnect the
CEU and the relevant sensor, then measure the resistance among the
ports of sensor in order to make sure there is open-circuit/ contact fault
or not.
z When checking if there is a short in the linet, please disconnect the
CEU and the relevant sensor, then measure the resistance value of the
ports between the connected port and the vehicle body. If the
resistance value is more than 1MΩ, there is no fault.
z Before disassembling the engine electrical control system cable, cut off
the power supply, that is, turn the ignition switch OFF and disconnect the
cables on the battery poles.
z Contact the test probe and the two terminals/ the two leads to be
measured when measuring the voltage between the two terminals or the
two leads.
z Contact the red test probe to the terminal/ the cable to be measured,
and the black probe to the ground when measuring voltage of one
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