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NEXUS R5 WIRING
SIGNAL GROUND
SIGNAL GROUND
Pull-up resistors are generally enabled for
temperature related sensors and switched
to ground inputs. The following configuration
requires the pull-up resistor be enabled.
Analogue Voltage Inputs (AVI)
Analogue Voltage Inputs are inputs to the ECU that
accept variable voltage signals from 0V to +5V
such as signals from pressure, temperature and
fuel level sensors.
SIGNAL GROUND
SIGNAL GROUND
AVI inputs can tolerate a maximum input voltage
SENSOR +5V
of 30V.
SENSOR +5V
These inputs can also accept switched inputs that
change between two different voltage levels.
Sensors with a +5V supply do not require the pull-up resistor
The On Voltage and Off Voltage define what the
be enabled, for example, rotary trim modules.
thresholds are between the on and off states.
Any Sensor +5V pin can be used with any Signal Ground pin
for sensors.
The voltage can be viewed as a channel in NSP to
determine the thresholds for a switched input.
Specs:
Common examples of switched inputs include A/C
• 0 to 5V
Request switch and intercooler spray switch.
• 1000 samples per second
AVIs have a software selectable 1K pull-up
resistor to 5V, which can be enabled or disabled
• Selectable 1k pull-up to 5V
within the setup page.
• -10 to 30V indefinite withstand
Pull-up resistors are generally enabled for
• 1.5kHz signal frequency max
temperature related sensors and switched to
ground inputs.
• All capable of DBW/narrowband use
AVI
AVI
TEMPERATURE
SENSOR
TEMPERATURE
SENSOR
AVI
AVI
ROTARY TRIM MODULE
HT-010504
ROTARY TRIM MODULE
HT-010504
20
Synchronised Pulsed Inputs (SPI)
Example Wiring Connections
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.
SIGNAL GROUND
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 50KHz
Maximum frequency.
Knock Inputs
Specs:
A knock sensor detects engine knock and sends a
• -10 to 10V digital input
voltage signal to the ECU.
• 0 to 5V analog input
• 1 million samples per second
The NEXUS R5 ECU uses the knock sensor signal
• Selectable 1k pull-up to 5V
to modify ignition timing if knocking occurs.
• -15 to 30V indefinite withstand
Knock detection can be performed by the ECU by
• 22.5kHz signal frequency max
installing a compatible piezoelectric knock sensor
mounted to the engine block.
HT-011000
FLEX
FUEL SENSOR
FUEL SENSOR
TO OTHER
DEVICES
FREQUENCY BASED FLEX FUEL SENSOR
KNOCK
KNOCK SENSOR
It is recommended that twin-core shielded cable
is used for knock sensors. Shields must be
terminated to battery ground at one end only.
Specs:
• -2.5 to 2.5V AC input only
• 160Hz to 48kHz signal frequency band
• +-3V indefinite AC voltage withstand
• 50V indefinite DC withstand
SPI
SIGNAL GROUND
HCO
Example Wiring Connections
21
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