Multisystem Ignition Analyzer
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about 3 minutes of inactivity.
Inactivity means:
◆
No buttons are pressed
◆
No measurements are taken
4. APPLICATION INFORMATION
4.1 Taking measurements
1- According to the instructions in
“3.4 Measurement Procedures”, select the ignition
system to measure.
2- Observe the spark burn time and spark KVolt reading of the display. It
’s normal that
there are some changes of the readings, it reflects the actual changes in the spark
voltage and burn time of the ignition system.
3- Record or memorize the maximum, minimum and average reading. Test every
spark plug wire or ignition module of the engine repeatedly, pay attention to the
reading which is obviously higher or lower than the average.
4- The ignition problems may sometimes appear at the high engine RPM, but not at
low or idle speed. We recommend to measure at idle speed and the normal engine
operating temperature, and then increase the RPM, until the high speed, generally
about 2000 to 2500 RPM. Please do not exceed the limited maximum value of the
engine speed (
“red-line”). All the measurements should be taken at about the
same engine speed, check the RPM by using the tachometer function of the
instrument.
4.2 Diagnostic using spark burn time and spark KVolt readings
Some changes of the spark burn time and spark KVolt readings between different
cylinders are normal, these do not indicate any problem.
Pay attention to the significant difference readings caused by the engine or the
ignition system problems for the diagnostic purpose.
Important:
◆
The RPM and the spark burn time shown on the display are the absolute
measurements.
◆
The spark KVolt is the relative measurement, it should be used to compare the
ignition module or the spark plug wire only in the same engine.
◆
In the COP mode, before measuring and comparing the results between cylinders,
please calibrate spark KVolt in one of the ignition modules as described in
“
3.4.2
Measuring Coil on Plug and Coil near Plug ignition systems
”
.
◆
The placement of the capacitive pick-up along the spark plug wire will also cause
some variation when measuring on spark plug wires ( SPW mode), due to the internal
resistance of the spark plug wire. For example, if the capacitive pick-up is placed on
the spark wire near the distributor or the DIS coil, the voltage reading will be higher
than if placed near the spark plug.
4.3 Common causes of long burn time readings
◆
Short circuit, dirty or the gap of the spark plug is too small.
Summary of Contents for KM20
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