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NEXUS R3 WIRING
MOUNTING TEMPLATE
14
Crank (Trigger) and Cam (Home) Inputs
Example Wiring Connections
The crank and cam position sensors are required
so that the VCU has the necessary information
available to determine engine speed and position
at any point in time.
Generally two sensors are required - a cam
position and crank position, however many
engines will have just a cam position sensor that
is capable of giving the VCU enough information to
run the engine correctly.
Vehicles that have a crank position sensor only
are not capable of determining the difference
between compression stroke and exhaust stroke
and therefore are not suitable for sequential fire
applications. In this case a cam position sensor
may need to be added.
It is recommended that four-core or twin-core
shielded cable is used for crank and cam position
sensors. Shields must be terminated to battery
ground at one end only.
There are two common types of crank/cam sensor
signals:
Specs:
• Hall effect/optical signal
• -10V to +10V input
(0-5V digital square wave signal)
• Selectable 1k2 or 440R pull-up to 5V
This type of sensor sends out a digital square
• Selectable ground reference (full differential
wave signal. Hall effect sensors usually have 3
standard mode)
wires; a power supply (5V, 8V or 12V), a ground
• -75 to +75V indefinite withstand
and a signal out wire. The power supply can be
• 48kHz max signal frequency
taken from the Sensor +5V pin, sensor +8V pin or a
HBO as required. The internal pullup will typically
need to be enabled in the settings for Hall effect /
optical sensors.
+12V (HBO5)
SIGNAL GROUND
CRANK (TRIGGER +)
CRANK (TRIGGER -)
HALL
EFFECT
+12V (HBO5)
SIGNAL GROUND
CRANK (TRIGGER +)
CRANK (TRIGGER -)
RELUCTOR SENSOR
indicates not connected. Please insulate and isolate to avoid damage to the ECU.
• Reluctor signal (analog style signal)
This type of sensor sends out a sine wave type
of signal and will generally use two wires, signal
positive (+) and signal negative ( - )
Reluctor sensors do not require external power
as these sensors can generate their own voltage
signal as the sensor reads a moving tooth or
trigger. The internal pullup will need to be
disabled in the settings in NSP for reluctor
sensors.
15
SENSOR
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