Perfect Power XMS4A - BASIC XMS4 A-4 A WIRING DIAGRAM

LETRIPP II XMS4A DIY MANUAL V2.1 www.perfectpower.com 52
PERFECT POWER XMS4A – Engine Management System DIY MANUAL V2.1
32.4 SPARK PLUGS
Take one spark plug lead and a working spare spark plug to check that you have spark under
cranking. The spark plug must be earthed when you do this test. If you can see the plug spark
then repeat the test on all the other leads. Now you have confirmed that you have spark on a
known working spark plug using all of your ignition leads. Take the all the sparkplugs out and
run the same test on each of them. If any fail to spark then replace all the sparkplugs with
new ones.
32.5 COIL
Coils can get damaged and sometimes you can see cracks or bloated areas on a coil that
clearly shows that the coil is now useless. If you can see obvious damage to the coil then
replace it straight away. If no visible damage to the coil can be seen you will need to test the
coil in the following ways:
32.6 TWO WIRE COIL
One wire is +12 volts and the other wire goes to the ignition amplifier. Take the wire off the
ignition amplifier and lengthen it so it can reach the negative terminal on the battery, I will
refer to this wire as the trigger wire. Don’t secure it to the battery. Take the coil lead off the
distributor and place the end close to a piece of metal on the engine. There must be an air gap
between the lead and the metal. Take the trigger wire and tap it onto the negative battery
terminal. If you see a spark from the end of the coil lead to the metal on the engine as you
tap the wire on the battery then the coil is good. If you still do not have any spark then the
coil must be replaced.
Note: DO NOT leave the trigger wire connected to the negative battery terminal. This will
cause damage to the coil.
32.7 THREE WIRE COIL
This type of coil has +12 volts and two signal inputs from the ignition amplifier. This coil is
referred to as a wasted spark coil pack. Take both wires off the ignition amplifier and lengthen
them so they can reach the negative terminal on the battery, I will refer to these wires as the
trigger wire 1 and 2. Don’t secure them to the battery. Take the coil leads off of the spark plug
and place the ends close to a piece of metal on the engine. There must be an air gap between
the lead and the metal. Take the trigger wire 1 and tap it onto the negative battery terminal.