________________________________________________________________________
XDI200 Manual Version 0.1
- Page 28 -
©2017 Electromotive, Inc.
a good connection to ground. If more than one DFU is used on a vehicle, each one
will require its own ground wire.
Additionally, make sure that the
coil screws
are fully tightened at all times!!
4.3.4 Spark Plug Wiring High Voltage Side
The coils fire in a specific order for each engine configuration. The proper coil must be
connected to the correct cylinder in the firing order.
Coil Notation
The following notation is used when referring to coils. A letter and a number are combined
to identify a coil. The letter refers to the coil location on the DFU. The coil located closest to the
connector is Coil A. The coil next to it is Coil B. If the DFU contains three coils, the last coil is
Coil C. The number identifies the DFU that the coils are on. In an engine configuration using
only one DFU, the number following the letter is 1. Coil notation is shown in Figure 26.
Note: Each coil has two towers for spark plug wires. The towers are identical and should be
thought of as the same coil. For example, if the engine setup guide refers to cylinder 1 connected
to Coil A1 and cylinder 6 connected to Coil A1, you can connect your spark plug wires for the
respective cylinders to EITHER tower.
Figure 26 shows a configuration using two 3-
coil DFU’s. If you are using 2-coil DFU’s the
numbering is the same except there is not C1 and C2. If your application requires only one DFU,
then A2, B2, and C2 will not be needed.
Figure 26 :
Coil notation
