17
NEXUS R3 WIRING
Injector Outputs
All injectors are to be wired directly to the VCU’s
corresponding cylinder output pins.
When an injection event occurs the VCU will
ground the output pin, opening the injector.
All injectors must be wired to a 12V
supply from one of the High Current Outputs on
the NEXUS R3.
When not used for injection, pins can be used as
generic Digital Pulsed Outputs (DPO) capable of
switching 2A to ground.
Specs:
• Number of channels: 8
• Current controlled output
• 8A Peak, 2A Hold
• 0 to 55V voltage feedback
Unused injector outputs can also be used as:
• Generic switched or PWM outputs (2A)
• Low speed digital switch inputs (0-12V)
INJ 1
INJ 4
INJ 2
INJ 3
INJ 5
INJ 8
INJ 6
INJ 7
25A-
HCO1
8-CYL
INJECTION
SEQUENTIAL
1
3
5
7
2
4
6
8
(WIRE AS PER CYLINDER ORDER)
16
Example wiring connection shown: Sequential injection wiring with 25A-HCO1 used as injector 12V.
Ensure the high current output used to power the injectors is capable of supplying the required
current.
Ignition Outputs
The ignition outputs produce a signal between
12V and ground to control the charging and firing
of an ignition coil. Ignition outputs can only be
connected directly to ignition coils if the coils are
equipped with internal ignitors.
Ignition coils without internal ignitors draw large
amounts of current and thus must use an external
ignitor module to be safely triggered by the
VCU. Connecting directly to ignition coils without
internal ignitors will damage the VCU.
Specs:
• Number of channels: 8
• Software selectable global 12V or 5V pull-up
• Software selectable individual 270R pull-up
• 10kHz switching speed
• Automatic overtemp, overcurrent, flyback
protection
• 0 to 27V voltage feedback
Unused ignition outputs can also be used as:
• Generic DPO (3A sink) or PWM outputs
• Low speed digital switch inputs (0-12V)
WARNING
Connecting the VCU to an ignition module before
setting the ignition firing edge correctly may
damage the module and coils, therefore it is
advised to disconnect the module or disable the
power to the ignition system until the unit has
been setup and configured.
IGN 1
IGN 4
IGN 2
IGN 3
IGN 5
IGN 8
IGN 6
IGN 7
25A-
HCO2
8-CYL DIRECT FIRE IGNITION
1
3
5
7
2
4
6
8
(WIRE AS PER CYLINDER ORDER)
Example wiring connection shown: Direct fire ignition wiring with 25A-HCO2 used as ignition coil 12V.
Ensure the high current output used to power the ignition coils is capable of supplying the required
current.
NOTE: The coils depicted in this diagram (HT-020102) have internal ignitors. Do not connect ignition
outputs directly to coils unless they have internal ignitors as this will damage the VCU. If your coils
are without internal ignitors an external ignitor must be used.
