LAUNCH X-431TOP User’s Manual
Fig. 3-11
Fig. 3-12 shows the interface of measuring
“ voltage”.
Fig. 3-12
System auto-setting parameter and
display the signal waveform clearly.
Ignition Analysis
Generally speaking, diagnosis engine starts with
ignition system. Nowadays ignition system
includes distributor and distributorless.
Distributorless includes independent ignition and
simultaneous ignition. (See fig 3-13)
Fig 3-13
Distributor Ignition Analysis
Connection description:
1. Connect one end of the battery double-clip
to the battery for electricity, and the other
end to the X-431TOP terminal DC port
(refers to the X-431TOP terminal button and
port description).
2. Connect one end of the oscilloscope GND
cable to the X-431TOP terminal GND
channel and the other end to the ground.
3. Connect one end of one cylinder signal
cable to the CH2 of the X-431TOP terminal
and the other end to the high-tension cable.
4. Connect one end of the primary signal patch
cord to the CH1 of the X-431TOP terminal
and the other end to the primary positive of
the ignition coil.
Distributor ignition mode diagram
1-X-431TOP terminal 2-battery
3-battery cable w/two clips
4-oscilloscope GND cable（connecting GND）
5-cylinder signal clip（connecting CH3）
6-oscilloscope cable（connecting CH2）
7-distributor 8-ignition coil
9-primary signal patch cord（connecting CH1）
NOTE:
1. From cigar lighter: insert one end of the
cigar lighter cable into the lighter socket
in vehicle and connect the other end to
the DC power connector of X-431TOP
Terminal.
2. From double-clip power cable: connect
one end of the double-clip power cable to
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