Nitrous Express NISSAN GTR PLATE SYSTEM - Manual (Page 5)

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7. Attach one wire from each of the solenoids to the “Green” wire on the relay. Note: These coils are
direct current and it does not matter which wire is used. Now attach the two remaining solenoid wires
to a good ground.
8. Attach the “White” wire from the relay to one terminal of the fuel safety switch (if you are using one)
(PN 15718). Using the 18-ga. blue wire, attach the other terminal on the safety switch to ground. (See
wiring Schematic) Note: If a fuel safety switch is not used simply attach the “White” wire on the relay
to ground.
9. Reconnect the battery cable.
10. Now you must program the NX TPS Module.
A. You will need to turn the key to the on position, it is not necessary to start the vehicle.
B. This switch works with rising or falling TPS signal as long as it has at least a 1v deviation between
idle & wide open throttle. When in learn mode, the unit first does a 5 second idle signal analysis.
If too much signal noise is found, it flashes an error (this is to catch a bad TPS or when connected
to wrong wire).
C. Once the switch is wired according to the schematic, you will need to put it in learn mode. Learn
mode is achieved by pushing and holding the button for 3 seconds, at which point the GREEN
LED on the switch will blink slow. This tells you it is checking the TPS idle voltage. This takes
approx. 4 seconds. DO NOT change the throttle position during this time. Once the GREEN LED
turns off you can proceed.
D. Now take the vehicle to full throttle and back to idle two times. If the GREEN LED is ON solid,
then your TPS is set. If the GREEN LED is flashing, the TPS Switch detected a variation between
the 1st and 2nd full throttle position and as a a precaution, did not learn that setting. You will
need to turn off the switch and start the learn procedure again. If the GREEN LED is still OFF,
the TPS signal range may be too small or you have the switch connected to the wrong wire.
NOTE: Once the switch has learned your full throttle position, the GREEN LED will be
ON whenever the switch has power and the RED LED will be on when the switch sees
full throttle
11. At this point both solenoids should be tested for proper operation. Note: (Be sure the nitrous bottle is
off and there is no pressure in the N2O supply line). If you are using a fuel safety pressure switch you
must use a jumper wire between the two terminals when testing the solenoids. To test, turn the
“arming” toggle switch to the ON position and push the accelerator pedal to achieve wide-open
throttle. A clicking sound should be heard as you exceed 80% throttle and the solenoids open.
IMPORTANT: Make sure that both of the solenoids are clicking! If no sound is heard or only one of
the solenoids is working, check all wire connections and the wiring schematic for proper connections.
12. With all components mounted, feed line and electrical connections completed, connect the nitrous
supply line to the bottle and FULLY open the bottle valve and carefully check connections on the
nitrous side of the system for leaks and retighten fittings if necessary. With no leaks detected, start the
engine and thoroughly check the fuel connections for leaks. Do not attempt to start engine if nitrous
has been accidently injected into the intake manifold. Disconnect all of the coil wires and crank the
engine several revolutions with the throttle wide open to clear the engine of all nitrous before
attempting to start engine.