HOMCOM C20-010 Benutzerhandbuch Seite 11

VI. Inspection of the control part of the ignition advance
he control of the ignition advance is to guarantee that the ignition system can ignite at the
appropriate time during the compression stroke. The control of the ignition advance
includes: mechanical advance control, vacuum advance control, and electronic advance
control, etc.
Note: The inspection methods of the vehicle's ignition advance vary greatly. The following
mentioned method is the general method to inspect mechanical/centrifugal type ignition
advance. When checking the ignition advancing angle, one should confirm that the refer-
ence ignition time and the closing angle are correct. Refer to the repair manual to under-
stand correct inspection procedure and technical requirement.
Make sure that all the safety rules are observed.
VII. Inspection of the electronic ignition advance
The inspection of the electronic ignition advance control varies from vehicle to vehicle.
Please refer to the repair manual.
VIII. Trouble shooting of the timing lamp
If the timing light doesn't work or work abnormally, inspect the following items:
8-1. Make sure that the connection between the battery jar clip of the timing light and the
battery jar is reliable.
8-2. Make sure that the polarity connection between the battery jar clip of the timing light
and the battery jar is correct (the red clip should be connected to the anode "+" ,and the
black clip should be connected to the cathode"-").
8-3. Make sure that the surface of the up/down ferrite magnetic block in the inductive signal
pickup device is clean. If necessary, clean the ferrite magnetic block according to the
section of the timing light maintenance and points for attention.
8-4. Make sure that the inductive signal pickup device is correctly connected to the high
voltage wire of cylinder 1.
8-5. Make sure that the spark plug of cylinder 1 works normally.
8-6. Connect the inductive signal pickup device to the high voltage wire of the other cylin-
der 1, press the flash frequency light, if the timing light flashes, check the spark plug of the
cylinder 1, and then conduct the following work.
Note: Anything wrong with the low ignition voltage of the spark plug and the high voltage
wire can result in the abnormal operation of the timing light. Clamp the inductive signal
pickup device at other places of the high voltage wire to see if things will change. The
electromagnetic wave produced by some ignition systems and special high voltage wires
(solid wire core high voltage wire, high voltage wire of racing vehicle, high voltage wire of
off road vehicle) is higher than EMI and RFI standards, thus the testing equipment can not
work normally. Contact relative manufacturers to learn the correct test requirement.
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