4
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The ground conductor of this product has two branches (black and brown).
This has a very important significance to secure the voltage conversion
accuracy. Connect the ground conductor by referring to the following figure.
Installing the ground conductor in a different way from the connecting method
specified by A’PEX will give damage to this product and the mounted car engine.
The above figure explains only the connection of the ground conductor. For the
other signal lines, refer to page 6 and page 7. Be sure to wire the power cable,
ground conductor and other signal lines to the positions specified by A’PEX.
Correct Connecting Method for the Ground Conductor
Connect the ground conductor to two positions of the same line.
Be sure to connect the brown wire to the ECU side.
Allow a space of 1 cm or more between the connecting point of the black wire
and the connecting point of the brown wire.
Brown wire (ground)
Engine
Control Unit
（ＥＣＵ）
Vehicle harness
Black wire
(ground)
Wrong Connecting Method for the Ground Conductor
Unite the ground
wires into a single
line.
Do not connect the
ground conductor
to any position
(e.g. chassis ground)
other than the
specified position.
Engine
Control Unit
（ＥＣＵ）
Engine
Control Unit
（ＥＣＵ）
Vehicle harness
Brown wire (ground)
Black wire
(ground)
Vehicle harness
Brown wire (ground)
Black wire
(ground)
