10
2/5/2019 - DOCUMENT NUMBER: 10-2226
© 2019 AEM Performance Electronics
30-2226 6 Channel CAN Sensor Module
Analog Inputs 3 - 4
These inputs have a 100kOhm 5V pull-up resistor and are suitable to measure voltage signals from 0-5V sensors or
devices; either sensors that are being added to a vehicle or pre-existing (or OEM) sensors. Pre-existing/OEM sensors are
presumed to be already connected to a factory ECU or logging device which will require different wiring considerations.
Please refer to the table below for connection examples.
New / Added Sensors
5V Sensor
Power
Sensor Signal
Sensor
Ground
Examples
Three wire pressure
ü
ü
ü
Manifold pressure, oil/water pressure, etc
Three wire position
ü
ü
ü
Throttle/pedal position, linear potentiometer, etc
Three wire flow
!
ü
ü
Check with manufacturer, some MAFs require 12V power yet
output a 0-5V signal
Device
û
ü
ü
AEM 30-4110 UEGO Gauge with 0-5V Output
Existing / OEM
Sensors
Three wire pressure
û
ü
ü
Manifold pressure, oil/water pressure, etc
Three wire position
û
ü
ü
Throttle/pedal position, linear potentiometer, etc
Two wire temperature
û
ü
ü
Intake, coolant/oil temperature, etc
Three wire flow
û
ü
ü
0-5V voltage-style MAF sensor
Device
û
ü
ü
AEM 30-4110 UEGO Gauge with 0-5V Output
ü
=Connect
û
=Don't connect
CAN Output
The measured voltage will be output via CAN and will have to be scaled to the desired units (e.g. temperature, pressure,
percentage, etc) in the receiving device. A thermistor's voltage/resistance varies non-linearly with temperature and thus
the receiving device will likely require a look-up table to properly log or display temperature. Most non-temperature
sensors require a simpler linear scaling. The AEM CD series of dashes have both of these capabilities; please refer to the
appropriate documentation.
Tachometer Input
This input is suitable for measuring engine speed from a variety of sources such as an ignition coil's negative (-) terminal or
an ignition box/driver's 'tachometer' output. If your vehicle is equipped with an aftermarket high-output or multi-strike
ignition system, do
*not*
connect this input to the ignition coil. Instead, use the dedicated tachometer output wire from
your ignition system. "Flying Magnet" or VR style sensors should *not* be connected to the tachometer input.
CAN Output
The measured frequency will be output in Hertz via CAN and will have to be scaled to engine speed (RPM) in the receiving
device. The AEM CD series of dashes have this capability; please refer to the appropriate documentation.
Fuel Level Sensor Input
This input is suitable for connection to a resistive fuel level sensor. The output of these sensors typically varies from
slightly above 0 Ohms to a maximum of 250 Ohms. It is important that the AEM CAN Sensor Module is the only device
connected to the fuel level sensor. Tapping on to a sensor that is already connected to an OEM ECU (or similar) will
result in inaccurate readings.
CAN Output
The measured resistance will be output via CAN and will have to be scaled (typically linear) to fuel level (or percentage) in
the receiving device. The AEM CD series of dashes have this capability; please refer to the appropriate documentation.
Note: The CAN output value, in Ohms, may appear to be slow to respond to input sensor signal changes. This is as-
intended since this input is heavily filtered to account for fuel level slosh.
