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LAUNCH KES-200 Starting System Analysis
E-5
1
2
3
4
5
6
7
8
Fig.4-11
1.
KES-200 main unit
2.
Engine analysis cartridge
3.
Battery
4.
Battery cable
5.
Main cable
6.
Ground cable
7.
Secondary ignition signal wire
8.
Secondary signal cable
CONNECTION 7:
The high-tension wire of one plug
is exposed and that of another plug is located inside
the ignition coil. The primary lead is hidden. In this
case, only the secondary ignition waveform can be
tested. Select secondary trigger mode to get the
secondary ignition waveform. To test the high-tension
ignition signal waveform hidden in the ignition coil, use
the secondary signal slice sensor to get the secondary
ignition waveform. The connection is as shown in
Fig.4-12.
1
2
3
4
5
6
7
8
9
Fig.4-12
1.
KES-200 main unit
2.
Engine analysis cartridge
3.
Battery
4.
Battery cable
5.
Main cable
6.
Ground cable
7.
Ignition coil
8.
Secondary signal slice sensor
9.
Secondary signal connecting cable
Precautions on Connection
z
Use oscilloscope cable as primary signal cable.
Use needle or alligator clip to impale the
negative lead of primary ignition coil.
z
Do not touch the needle by hand for it has high
voltage.
z
When using cylinder 1 signal cable, be sure to
put the clips’ side marked with “SPARK PLUG
SIDE” facing the spark plug of cylinder 1. The
plug next to the alternator is usually cylinder 1
spark plug. After cylinder 1 signal cable is
connected, the unit will show a ground mark (
▼
)
with twinkling on condition that the signal
triggering is good.
z
If cylinder 1 signal cable is not connected
correctly, the waveform may not be displayed. In
case the high-tension wire of cylinder 1 is
ineffective or cylinder 1 can’t be fired, connect
the signal cable to the high-tension wire of other
cylinder. The firing order should be
re-determined.
z
KES-200 defaults that the cylinder 1 signal cable
is connected to cylinder 1. The firing order for
4-cylinder engine is normally 1-3-4-2. When the
cylinder 1 signal clip is connected to cylinder 3,
the ignition waveforms should be displayed in
the order of 3-4-2-1, but the screen still shows
the cylinder numbers in the order of 1-3-4-2.
Likewise, when the cylinder 1 signal clip is
connected to cylinder 2, the ignition waveforms
should be displayed in the order of 2-1-3-4. And
while cylinder 1 signal clip is connected to
cylinder 4, the display order should be 4-2-1-3.
z
When the secondary signal cable is connected
to the secondary high-tension wire, its bronze
arc face of the probe must touch the
high-tension wire tightly. No gap is allowed.
When testing primary/secondary ignition
waveform, be sure the ground cable is