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NEXUS R3 CONNECTIONS
Synchronised Pulsed Inputs
Synchronised Pulsed Inputs are capable of
measuring the position, duty cycle, frequency or
state of a signal, as well as analog voltage inputs.
These inputs are suitable for sensors such as cam
position sensors, fuel composition sensors, road
speed sensors and flat shift switch.
Synchronised Pulsed Inputs are compatible with
digital (hall effect or optical) and reluctor (analog)
based sensors, have a maximum input voltage
rating of 25V and can measure up to 22.5KHz
Maximum frequency.
Specs:
• Number of channels: 6
• -10 to +10V digital input
• 0 to 5V analog input
• Selectable 1k pull-up to 5V
• -15 to +30V indefinite withstand
• 22.5kHz signal frequency max
Analog Voltage Inputs
Analog Voltage Inputs (AVIs) are inputs to the ECU
that accept variable voltage such as signals from
pressure, temperature and position sensors. These
inputs can also accept switch signals that change
between two different voltage levels.
AVIs have a software selectable 1K pull-up resistor
to 5V, which can be enabled in the software for use
with temperature related sensors and switched to
ground inputs.
Specs:
• Number of channels: 11
• 0 to 5V analog inputs
• 1000 samples per second
• Selectable 1k pull-up to 5V
• -10 to +30V indefinite withstand
• 1.5kHz signal frequency max
+5V
AVI 1
SIGNAL
GROUND
AVI 2
AVI 3
AVI 4
AVI 5
AVI 6
AVI 7
AVI 10
AVI 11
+5V
SIGNAL
GROUND
SPI 1
SPI 2
SPI 3
SPI 4
+12V
(HBO 6)
SIGNAL
KNOCK 1
KNOCK 2
GROUND
SIGNAL
GROUND
Knock Inputs
The Nexus R3 universal wire-in harness has
allocated dual knock sensor input shielded cables.
Knock detection can be performed by the VCU by
installing a compatible piezoelectric knock sensor
mounted to the engine block.
Specs:
• Number of channels: 2
• -2.5 to +2.5V AC input only
• 160Hz to 48kHz signal frequency band
• +/-3V indefinite AC voltage withstand
• 50V indefinite DC withstand
NOTE:
Mu5V and +12V (HBO6) power and signal
ground wires are fitted in the harness for use
with AVIs and SPIs. Any signal ground wire can
be paired with any power wire required by the
sensor.
DPO CONTROLLING
A VVT SOLENOID
+12V
DPO 6
(HBO 6)
Digital Pulsed Outputs
Digital pulsed outputs are used to switch devices
to ground or provide frequency or pulse width
modulation control (PWM) if required. Typical low
current devices used with DPOs are relays, idle air
control valves, boost control solenoids, etc.
Three DPOs are fitted for engine bay devices but
more can be reallocated from the cabin side of the
harness if the application requires.
Specs:
• Number of channels: 6
• Selectable 4k7 pullup to 12V, to 5V, or disable.
• Overcurrent, overheat, and flyback protection
• Low side drive (3A max current)
• 10kHz switching speed
• 0 to 27V feedback
Unused DPOs can be also be used as:
• Generic PWM outputs
• Low speed digital switch inputs (0-12V) with
pullup enable.
+12V
DPO 4
(HBO 6)
+12V
DPO 5
(HBO 6)
+12V
DPO 6
(HBO 6)
ENGINE SIDE
ALLOCATED DPOs
+5V
+8V
(200mA)
(200mA)
5V Sensor Power Supply
Mu5V power supply wires are fitted into
this harness to power typical 3-pin analog voltage
devices such as pressure sensors, throttle position
sensors, rotary trim switches, etc. The total current
supplied by the Nexus R3 for these +5v power wires
is 200mA.
If the application specifically requires, a +8V power
supply wire is also available for use and can also
source current up to 200mA.
