User Manual

53
UT108/109 OPERATING MANUAL
UT108/109 OPERATING MANUAL
54
G. Voltage Drop Testing
Test the voltage drops caused by the switch, cable, solenoid or connector. Any abnormal
voltage drop generally results from an additional resistance. The resistance will restrict
the currents upon the start of the engine, leading to the reduction of the load voltage of the
battery and the slow-down of the start of the engine.
1. Cut off the ignition system so as to disable the start of the automobile.
Cut off the main ignition coil, shunt coil, cam and starting sensor so as to cut off the
ignition system. Operate by reference to the automotive manual.
2. Set the rotary switch to DCmV or DCV. Insert the red test lead into the A terminal and
the black test lead into the COM terminal.
3. Refer to the LOSS typical trigger voltage circuit. (See gure 15)
Test the voltage between any of the following pairs of points respectively:
1&2, 2&3, 4&5, 5&6, 6&7, 7&8, 8&9, 8&10
Component Voltage
Switch 300 mV
Lead 200 mV
Grounding 100 mV
Battery Lead Connector 50 mV
Wiring 0.0 V