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NEXUS R5 WIRING
INJ #1
Injection Outputs
INJ #2
All Injectors are to be wired directly to the ECU's
corresponding cylinder output pins.
INJ #3
When an injection event occurs the ECU will
ground the output pin, opening the injector.
INJ #4
All injectors must be wired to a common +12V
supply from one of the High Current Outputs on
INJ #5
the NEXUS R5.
When not used for injection, pins can be used as
generic Digital Pulsed Outputs (DPO) capable of
INJ #6
switching 2A to ground.
Specs:
INJ #7
• Current controlled output
• 8A Peak, 2A Hold
INJ #8
• 0 to 55V voltage feedback
HCO
Example wiring connection
(Sequential Injection wiring shown)
SEQUENTIAL INJECTION
WIRING SHOWN
Ensure the High Current Output (8A or 25A) used to
power the injectors is capable of supplying the required
current.
16
Digital Pulsed Outputs (DPO)
HBO 1
Digital Pulsed Outputs are capable of producing
pulsed waveforms with varying duty and
HBO 2
frequency.
When a Digital Pulsed Output is activated by the
ECU the output will switch to ground.
HBO 3
The pull-up voltage specifies the waveforms
maximum voltage output eg 0 to 12V or 0 to 5V.
HBO 4
DPOs can be used to control various low-current
devices such as shift lights, bypass air control
valves, boost control solenoids, tachometers etc.
Specs:
• Individual software-selectable 12V or 5V
Example wiring connection
4k7 pull-up
Half Bridge Outputs (HBO)
• Flyback protected
Half Bridge Outputs are push-pull pulse width
• Capable of switching 3A to ground
modulated (PWM) outputs. If not being used as
• 10kHz switching speed
push-pull drivers, Half Bridge Outputs can be
used as generic high/low PWM outputs capable
• Automatic overcurrent protection
of sinking 8A to ground and driving 8A to 12V at
• 0 to 27V voltage feedback
2.2kHz.
DPO
HCO
Ensure the High Current Output (8A or 25A)
used to power solenoids and other devices is
TO OTHER
capable of supplying the required current.
DEVICES
DBW THROTTLE 1
DBW THROTTLE 2
HBOs can be used to control any push-pull type
device such as DBW throttle motors (max of 2
wired separately) and stepper motors.
When used as generic high/low switched or
PWM outputs, Half Bridge Outputs can be used
as generic low-side DPOs or to control devices
such as high-side driven solenoids (e.g. VTEC
Solenoids), high side switched automatic
transmission solenoids etc.
Specs:
• Capable of sinking 8A to ground and
BOOST
CONTROL
driving 8A to 12V
SOLENOID
• Automatic Overcurrent and
Overtemperature Protection
• 0 to 27V voltage feedback
• High side current feedback
• 18kHz switching speed in DBW mode
Example wiring connection
• Capable of 0-100% duty cycle
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