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Frequency MAF Installation
Operation:
The Frequency MAF mode is designed for vehicles where MAF is used and the output of their
MAF sensor is digital and a frequency.
Dip Switch Settings:
Frequency MAF
(40Hz - 220Hz)
Frequency MAF
(400Hz – 2200Hz)
1990 – 1999 Mitsu
1G/2G DSM
Frequency MAF
(2kHz – 14kHz)
Setup, Connection:
To setup your system for MAF you must first find the correct source to connect too. In order to
locate the correct signal the use of a voltmeter will be required. Once you have located your
MAF sensor you can begin to check the wires for the “signal” wire. The signal wire should
remain at or near 0 Volts when the car is turned off or is not running. Once the vehicle is started
it should remain at or near 2.5 Volts. This is because the signal has a duty cycle of 50% and a
voltage range of 0-5V so the average voltage will be about ½. To determine if you do in fact
have the correct wire you can try and rev the engine while monitoring the voltage. It should
remain the same regardless of the engine speed; if you are experiencing difficulty locating the
signal wire, refer to the vehicles service manual to locate the MAF signal wire, and then try to
verify again with a voltmeter. Once you have found the correct signal wire you may tap onto it
and connect it to pin #11 (blue) of the Water Methanol controller.
Testing:
To test your setup it is recommended you finish the installation, but before installing the nozzle
you run the engine and ensure the system is operating as expected. That is when the engine is
running and the MAF sensor is outputting in a range set by the controller you will get flow. You
want to ensure you are not getting flow when the engine is turned off or when it is not expected.
This could be due to improper wiring or having the incorrect mode selected.
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