I followed these instructions and it works perfectly on my truck,and they tell you specifically to do it with the engine off,no where do they tell you ,you have to drive it at WOT for 10 seconds,all they tell you is to hold the throttle blade open for 10 seconds with the key in the run position.This still works on my truck anytime I play with the throttle position opening,lol
7
IMPORTANT TECH NOTE! Due to the sensitivity of Dodge’s new throttle by wire system, the ZEX™ nitrous management unit may cause intermittent check engine lights on some vehicles if the included TPS resistor wire is not used. It is recommended that you install the enclosed white TPS resistor wire between the engine’s Throttle Position Sensor (TPS) output wire and the white TPS wire going to the ZEX™ Nitrous Management Unit. Use of this resistor will effectively isolate the Nitrous Management Unit and prevent check engine lights from occurring. This resistor in no way affects the activation or performance of your ZEX™ nitrous system.
Connect one end of the TPS Resistor Wire to the vehicle’s TPS voltage output wire. The correct TPS wire should have around .5 volts when the throttle blade is closed and around 4.5 volts when the throttle is opened fully. These are not exact voltage numbers, but simply give you an idea of the proper voltage you should be seeing. Connect the other end of the TPS resistor wire to the white wire from the Nitrous Management Unit. After these connections are completed, you need to install the arming switch/wire harness assembly. Find a suitable place in the interior of the vehicle for the arming switch and drill a 1/2 inch (.500) hole. Mount the switch and switch cover through this hole. Take the lead that the fuse assembly is attached to and find a suitable 12 volt accessory source of power under the dash. Use the T-tap electrical connector to splice into the 12 volt accessory wire and plug in the wire harness lead. Take the other lead from the arming switch and connect it to the red wire from the Nitrous Management Unit. As a reference for wire locations, use Fig. 8.
7. Program Activation Switch - Now that you have completed the wiring of your nitrous system, the next step is to program the Activation Switch.
IMPORTANT TECH NOTE! Due to unique throttle control programming from the factory, the throttle blade will not open with the accelerator pedal unless the engine is actually running. Since the ZEX™ Nitrous Management Unit’s throttle activation switch must be programmed by opening the throttle with the engine off, this would initially seem to pose a problem, but we have found a very simple solution. When the programming instructions call for the throttle blade to be opened to wide-open, simply remove the air intake tube from the throttle body inlet and manually open the throttle blade with a screwdriver, wooden dowel, etc.
To program the Activation Switch, turn the vehicle’s ignition on, but do not start the engine. Remove the air intake tube from the throttle body inlet. Turn the nitrous arming switch to the "ON" position. Go to the Nitrous Management Unit (NMU) and locate the push-button switch. Depress, then release, the push-button switch. Observe the NMU’s Operation Light. At this point, it should be RED. This RED light informs you that the NMU’s Activation Switch is in learn mode. Manually open the throttle blade to wide-open with a screwdriver, wooden dowel, etc. Hold it at WOT for ten seconds, then release the throttle blade, then go back to the NMU and observe the Operation Light. At this point, the light should be flashing continuously from RED to GREEN to OFF. This is the NMU’s way of telling you that it has successfully learned the voltage curve of your engine’s throttle position sensor. Go back to the driver’s compartment and turn off the system’s arming switch, then turn it back on. Go back to the NMU and observe the Operation Light. It should be solid GREEN at this point. This informs you that the system is armed and ready to activate at wide-open throttle. Open and release the throttle blade several times, you should hear the solenoids click each time you reach wide-open throttle. At this point, your Activation Switch is fully programmed and ready for use. If you ever transfer your nitrous system to another vehicle, perform this same procedure on the new vehicle to "relearn" the NMU’s Activation Switch.
