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Users Guide: iMFD Sensor Module
iMFD Sensor Module M-300TE
Version 1.0 May 1, 2008
*Please read the instructions completely through at least once before proceeding with the
installation to minimize errors.
*Double check polarity of power before powering it on for the first time.
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Overview:
(Figure 1, Rear View of M-300TE)
1. Connects to 12V-18V power source.
2. Analog outputs (0-5V linear wideband output, 0-1V narrowband output, ground)
3. Termination jumper. Closed for first SM in iMFD daisy chain.
4. Connects to next SM in iMFD daisy chain or to first DM
5. Connects to previous SM or unconnected if first SM in iMFD daisy chain
6. Connects to O2 Sensor Harness then to Bosch sensor.
Users Guide: iMFD Sensor Module
Install the Wideband Sensor:
1. Mount the wideband oxygen sensor before the catalytic converter and at least 24 inches downstream from your engine
block or turbo for optimal performance. The sensor element will fail if it is exposed to exhaust gas temperatures above 1562
deg Fahrenheit (850 deg Celsius). If you plan to replace your stock narrowband oxygen sensor with the PLX wideband,
please read PLXApp004 online for more information. The sensor will directly screw into an 18mm X 1.5mm pitch sensor
bung. The bung is available from the PLX Online Store.
2. You will hear a "click" when the connectors are properly mated.
(Figure2)
3. Connect the wire harness to the Sensor Module device by mating it with the M-300TE box indicated by “O2 Sensor”
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Users Guide: iMFD Sensor Module
Connecting Power to the Unit:
CAUTION! CONNECTING THE M-300TE IN REVERSE POLARITY WILL
DAMAGE THE UNIT! CHECK CONNECTIONS BEFORE POWERING ON.
1. The M-300TE accepts 12-18V DC for power. Connect the negative wire (black) to your vehicle’s ground. This is usually the
negative terminal of your automobile’s battery. Connect the positive wire (red) to your vehicle’s ignition power. This power
is only supplied when your key is turned passed a specific position and is off when your key is removed. Your power
connection must be capable of supplying at least 3 amps of current. A 5-7 Amp fuse is recommended for safety.
*If you plan to integrate the M-300TE Plug and Play with other aftermarket devices by utilizing the analog output signal wires. Make
sure that the negative wire (black) is connected as close as possible to your device's ground. This guarantees that both devices "see"
the same reference ground and a more accurate interpretation of the output voltages will be achieved. Please refer to the PLXApp
notes online for more information.
2. Locate the 2.1mm Power plug. Unscrew the plas tic cover and insert it into the red/black power wires.
3. Solder or crimp the red power wire to the CENTER of the connector. (12-18V)
4. Solder or crimp the black power wire to the SHIELD of the connector. (GROUND)
(Figure 3)
5. The unit takes approximately 60 seconds for the oxygen sensor to heat up and produc e accurate measurements.
6. Sensor calibration is not needed. The M-300TE is self calibrating and no user intervention is required.
Using the Sensor Module in the iMFD Chain:
1. M-300TE is also a SM sensor module, just as SM-AFR as a sensor module in daisy chain.
2. If the M-300TE is the only sensor module or last sensor module in the iMFD chain, be sure to have the termination jumper
installed. Otherwise, remove the jumper. Please refer to (Figure 1) for the location of the termination jumper.
(Figure 4)
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Using the Sensor Module Analog Outputs:
Wideband Linear Analog Output (0-5V)
0V=10AFR (Gasoline) 0.68 Lambda, 5V = 20AFR (Gasoline) 1.36 Lambda
Users Guide: iMFD Sensor Module
(Figure 5)
Narrowband Analog Output (0-1V)
*If you plan to integrate the M-300TE with stand alone engine management systems, piggy back systems, data loggers or any other
devices that utilize the two analog outputs, noise filtering capacitors must be installed near the application. Th e included capacitors
filter out unwanted electrical noise produced from your vehicle’s ignition and other onboard systems. This provides added signal
integrity for more accurate, reliable, and consistent measurements. Any 0.1uF 50V cera mic capacitor will work.
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Users Guide: iMFD Sensor Module
(Figure 6)
Compatibility with Other Fuels:
The above graphs assume that the device will be used with gasoline (14.7). The M-300TE is also compatible with the following fuels
when the button knob is turned.
properly register new fuel type)
Knob Pos. Fuel Type Stoichiometric Point
0 (“GAS”) Gasoline 14.7
1 (“dSEL”) Diesel 14.6
2 (“E85”) E85 9.76
3 (“Eth”) Ethanol 9.0
4 (“N7th”) Methanol 6.4
5 (“LPG”) LPG 15.5
6 (“CNG”) CNG 17.2
7 (“LdA”) Lambda 1.0
8 (“NULL”) No Function Not Applicable
9 (“NULL”) No Function Not Applicable
If the fuel type is not listed on the table above, to find the new relationship of AFR to output voltage, simply multiply the lambda
value by the specific fuel’s stoichiometric air/fuel ratio.
Example: If your engine uses E20 (20% ethanol / gasoline blend) instead of gasoline. The conversion will be as follows.
1) Divide the AFR value by 14.7 (gasoline) to obtain a lambda value
2) Multiply the lambda value by the stoichiometric point of the E20 (13.5)
(Reminder: Please kindly wait for 2 seconds after changing the fuel select from one fuel type to another to
Illustration only of Knob Pos. ,
DO NOT REMOVE KNOB CAP
Troubleshooting:
1. Upon powering up, the WB analog output should read 2.3V-2.4V with the O2 sensor disconnected.
2. With the O2 sensor connected and exposed to free air, the WB analog output should read starting from 2.35V climbing up to
5.0V
If test #1, #2 pass, your M-300TE is properly working, otherwise, replace the O2 sensor. Replacement sensors are available from
the PLX Online Store.
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Recommend Accessories:
Users Guide: iMFD Sensor Module
DM-5 AFR 52mm Gauge. Ideal for Gauge type Display from your M-300TE
Mounting Stand is INCLUDED for your M-300TE
Included Items:
1. M-300TE main unit
2. Bosch LSU 4.2 wideband sensor
3. O2 sensor harness 10ft
4. 4ft power wire with 2.1mm connector
5. 4ft Analog wires and connector with 4 terminals
6. 1ft Serial Cable
7. Termination jumper
8. 0.1uF 50V ceramic capacitor QTY2
9. Users guide
Specifications:
Physical Dimensions 2" x 2.875" x 1.125" (52mm x 75mm x 28mm) L x W x H
Technology PLX Critical Response Technology, Fast Response PID
Accuracy < 0.1AFR (Gasoline) Wideband, < 0.2AFR (Gasoline) Narrowband
Measurement Range 10-20AFR, 0.68 lambda - 1.36 lambda
Analog Outputs Wideband Linear 0-5V, Narrowband 0-1V (Driving Current 20mA)
Operating Voltage 8V-18V
Power Consumption 30 Watts (Max), 18 Watts (Typical)
Power Supply Technology High Efficiency Switching
Operating Temperature 30 – 1562 Deg F (0 - 85 Deg C)
Sensor One Bosch LSU 4.2
Enclosure Extruded Aluminum
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Users Guide: iMFD Sensor Module
TERMS OF USE
PLX Devices Inc. does not guarantee the M-300TE functionality with any ECU, data logger or other devices that uses the output
signals. Implementation and integration of the M-300TE with any other device(s) must be done at your own risk. Improper
installation and usage may lead to engine damage. Mount and install the M-300TE in a location where it does not obstruct the
driver’s view and/or ability to safely control the vehicle.
LIMITED WARRANTY
PLX Devices Inc. warrants this product to be free from defects for 1 year from the date of purchase. If applicable, Oxygen sensors
and other non-serviceable items are excluded from stated warranty. S erviceable goods must be determined by PLX Devices to be
defective before any warranty or replacement is issued. PLX Devices’ ob ligation under warranty shall be limited to repairing or
replacing, under the discretion of PLX Devices, any part proven defective. This warranty is limited to the repair or replacement of
parts in the manufactured good and the necessary labor done to affect its repair or replacement.
SERVICE UNDER WARRANTY
In the unlikely event that your PLX Devices hardware should fail during the warranty period, a Return Material Authorization number
(RMA) must be first retrieved from PLX Devices Customer Support. Support can be contacted through email:
or by phone: 408-745-7591. All serviceable goods must be packaged securely with proof of purchase, RMA number, with all shipping
charges prepaid and shipped to PLX Devices Inc. Goods returned under warranty must be received by PLX Device s Inc. within ten
(10) business days after the RMA number has been issued. Goods received after this period is subject to fees for the service of repair
or replacement. All repaired or replaced items shall be warranted for the remainder of the original product warranty.
RETURNS AND RESTOCKING FEE
A 15% restocking fee will apply to applicable PLX Devices products for refund. All returns are to be packed in original condition
including packaging, documentation, m a nuals, and accessories. Returns that do not include all the accessories and components may
be returned to the customer or charged on a per item basis. The customer assumes responsibility for product until receip t at PLX
Devices Inc., shipping via an insurable carrier is recommended. Any unauthorized shipping charges will be billed to the customer or
shipment will be refused.
DISCLAIMER
PLX Devices Inc. shall not be liable for direct, special, incidental, or consequential damages resulting from any legal theory including,
but not limited to, lost profits, downtime, goodwill, damage, injury to persons, or replacement of equipment and property due to
improper installation, integra tion and/or misuse of any PLX Devices Inc.’s product(s). This warranty applies to the original purchaser
of product and is non-transferable. All i mplied warranties shall be limited in dura tion to the said 1 year warranty
Revision History
Version 1.0 (5/1/08) Initial release
Version 1.0 May 1, 2008
www.plxdevices.com
(408)745-7591
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