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Old 03-27-2003, 02:12 PM   #1
Supapooh
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Join Date: Feb 2001
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Location: Eugene, Oregon
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02 2.slow

Question Problem With TPS voltage/Zex...?

I installed another Zex kit on my '00 2.5rs. This is the second kit I have installed on this car. The first worked perfectly. The solenoid would click at wot with the system armed (which is normal) Now to my problem... With the system armed I go wot, No solenoid click. The TPS wire is reading the 4.7-5.1 volts like it should. The only way to get the system to spray is to go wot. Then arm it. It will spray until I let off, but will not spray once I go wot again. This has me boggled.. Any help would greatly be appreciated.
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Old 03-27-2003, 02:54 PM   #2
kturner
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Dunno. Obvious stuff you probably already did like check all connections (not mixing TPS/Arming wires?), relearning the ZEX box? My ZEX works too well. I'm down to a 24 NOS flare jet and the clutch still slips on initial hit. Are you on stock clutch? Sorry we missed you at the Sweet Home event.
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Old 03-27-2003, 03:08 PM   #3
Supapooh
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The weird thing is. I can spray if I give it 12 volts of juice. Does yours have a reset button on it? I can't remember but I swear my first one did. Along with a power light. And the connections are one hundred percent power is going to and from the switch correctly all fuses are good. The purge works perfectly though It almost seems like the 5 volts is not enough to tell it to spray. I swear I remember having to make it learn the first time I isntalled my last one. But this box does not have the light or the reset on it... unless I'm going crazy and the first kit really did not have those. I am definently looking forward to the next meet. and Clutch and flywheel plus engine/tranny mounts and ss clutch line are all going in next month.
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Old 03-27-2003, 03:37 PM   #4
Legacy777
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Do the instructions say whether 5volts or what the recommended voltage should be for arming it?

It's possible, if this is the case, you'll need to hook a relay system up, where the 5 volt triggers the relay which triggers a 12volt source to arm the system.

Not sure if you could find such a relay or some other circuit.....but like you.....not sure how to make it work, unless it needs 12 volts.

Do you know where the arming wire goes to....does it just go into the computer?

It's possible they switched circuit types on the boards to sink 12v rather then 5v.

I'd suggest either confirming or denying that, and then go from there.

It's possible too that you got a bum unit.
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Old 03-27-2003, 03:38 PM   #5
kturner
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I am not near my car right now but my zex box definitely has a learn/reset button and a light that blinks/changes color while learning the TPS WOT voltage. I do remember being a little worried since the instructions seemed to reference a higher trigger voltage than I was measuring but it learned OK. I take it this is not a new box with complete instructions? Maybe you'll just need to rig an old style spray button or microswitch.

What clutch are you going with? I've got an ACT in hand but was hoping to experience one in a car before taking the install plunge.
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Old 03-27-2003, 04:09 PM   #6
Supapooh
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kturner - I printed the instructions off of the zex site last week the funny thing is there is no mention of the learn function in these instructions. I do remember in my previous instructions it had information on doing this. I don't want to mess with making microswitches, even though it could be done rather simply using radioshack parts. But that is the reason I bought the zex.. no switches. As far as my clutch goes it will be an exedy organic, and the flywheel will be a fidanza 9#

legacy777 - These instructions do not say anything about the actual voltage. I was thinking maybe some kind of relay that I could just wire in.. But thats more wires I do not want to run. I don't know why they would switch to a 12volt tps output. I don't know of any cars off the top of my head that would do that. I have an e-mail into them now. The unit appears to work fine, with the exception of the tps.
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Old 03-27-2003, 06:29 PM   #7
Legacy777
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Yeah....see what their tech support has to say.

They may be able to shed some light onto things.
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Old 03-27-2003, 08:47 PM   #8
Supapooh
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Yeah getting ahold of their tech support seems to be a joke. Ive sent 2 e-mails and have called twice today..
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Old 03-27-2003, 09:47 PM   #9
20mm
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Well maybe I can help you with this, considering I bought your previous zex kit And luckily for you I still have the instructions for programming the activation switch. Here's what it says:

"To program the activation switch , turn the vehicle's ignition ON, but do not start the engine. 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. Return to the drivers seat and depress the accelerator pedal to the floor, holding it there for ten seconds. Release the accelerator pedal and 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 is has successfully learned the voltage curve of your engine's throttle position sensor. Go back to the drivers compartment and turn off the systems 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. Return to the drivers seat and depress and release the accelerator pedal several times. You should hear the soleniod click each time you reach wide open throttle. At this point your activation switch is fully programmed and ready for use. "

Hope the helps bro...let me know if you need anything else

-Chad.
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Old 03-27-2003, 11:34 PM   #10
Supapooh
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Thanks Chad... I do need something else though. I need a push-button switch and an operation light. The nmu is completely devoid of it. And the latest instructions from the zex site do not show anything about it either..
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Old 03-28-2003, 01:21 AM   #11
20mm
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W T F kind of ghetto Zex kit did you buy? I wish I could help you but it sounds like you either have a newer zex kit or a really old one. You didn't get instructions with your kit? Anyway, good luck. I'll let you know what times I'm able to run with the 65 shot and the new clutch/flywheel, on a mainland track. Should be alot better than I could get on the worst track in the world, Hawaii Raceway Park. Talk about GHETTO!

-Chad.
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Old 03-28-2003, 01:48 AM   #12
Supapooh
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I think its a newer one... but I don't know I downloaded the instructions from the zex site and they don't show the learning ability. If I throw 12 volts at the tps it sprays.. hmm Anyway are you back in orygun for good or are ya here for spring break. But it sounds like you brought your car.
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Old 03-28-2003, 12:41 PM   #13
Supapooh
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well apparently the kit is over 5 years old as the zex "tech support" said. Their only suggestion is to check the wires.. damn I never thought of that. Now I have no idea what to do
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