LAUNCH X-431 PAD III User Manual
81
When checking if there is a short in the line, 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, no fault occurs.
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.
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.
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 terminal/ one
cable.
When checking the continuity of the terminals, contacts and leads, the
method for measuring their resistances can be used.
Check the faults in the terminals of the CEU to sensors, relays, etc.
There are two test probes in the testing wire. The black one is the common
signal terminal (signal GND); the red one is the input terminal for voltage,
resistance, and frequency test and output terminal for simulation voltage,
simulation frequency and oxygen sensor. Please choose the correct probes
to match the different terminals.
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