Spare Key will not start engine even with FOB on the same ring

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My factory spare key will not start engine even with FOB on the same ring. I have read that the key fob needs to be in the car for the spare to work.

Mine just turns over without starting. Any help would be appreciated.

2002 Land Cruiser
 
I use a non-chipped key I had cut at Ace hardware. I pulled guts out of master key and put in a FOB I bought from a vendor here on mud. The fob needs to touching, or on top of the key for the cruiser to start.
 
My factory spare key will not start engine even with FOB on the same ring. I have read that the key fob needs to be in the car for the spare to work.

Mine just turns over without starting. Any help would be appreciated.

2002 Land Cruiser
Post up a picture of what you're using. Most "factory" keys that I'm aware of have chip molded into the head of the key (valet key) or the 3-button key head. Not sure how the fob enters into it. Does the red security light go out when the key is inserted?

That said, I use an aftermarket flip key. The first version I tried positioned the chip too far away from the ignition to read, hence no start. By "too far" I mean about 1/2"...
 
Below are the two keys. I held the one with the FOB buttons up to the ignition while I tried to use the other one.
 
Below are the two keys. I held the one with the FOB buttons up to the ignition while I tried to use the other one.
I marked on your key where the transponder chip is located. With the spare key in the ignition, hold the part of the fob as close to the center of the ignition switch as possible and see if the red security light goes out. If the light goes out, your key should start the rig. It's possible your spare key either hasn't been programmed, or that it doesn't even have a chip. What do you know of the history of this key? It is possible that a PO just cut a blank for doors/glovebox. Cruiser shares a blank with other Toyota models that may not be chipped like the OEM valet key.
Screenshot_2016-06-23-13-24-53.jpg
 
Ok, I put the spare in and then the main key. The main key light does not light up. The only time I see the light is when I press the lock or the unlock buttons. I do not know the history of either key, the main key looks stock with much use. The other key is Toyota but I know nothing about it.
The spare key does turn the ignition over, but it will just not start.
 
I make a FOB shell that stores the FOB separate from a key. A buddy uses it with a plain metal key and relies on the remote in the FOB shell to allow the car to start. Normally it works just fine dangling on a key ring. If he is using in his words, "a ridiculous key chain" with a lot of keys and rings it occasionally won't start.

I haven't determined the range for the transponder, but it seems to be fine within an 1-1.5 inches or more from the face of the ignition. Much more than that and it becomes intermittent.

I think the red light earlier in the thread was meant to be the security light in the dash of the vehicle. I don't think the led in the FOB flashes when it's near the ignition.

YotaMD.com - Products - 100 Land Cruiser Key Fob

If all is working correctly, this distance should work fine:
fob_ignition_far.jpg
 
The transponder in your spare that isn't paired with your ECU is interfering with the working transponder in your other key. Get a $2 transponder-less key cut and I bet it will work.

If your other key is master, you could pair your spare with the ECU. IF it's a master...
Master Key Identification- Help Please!
 
The transponder in your spare that isn't paired with your ECU is interfering with the working transponder in your other key. Get a $2 transponder-less key cut and I bet it will work.

If your other key is master, you could pair your spare with the ECU. IF it's a master...
Master Key Identification- Help Please!
I will try that. Thanks everyone for the advice.
 
@Strand4x4 Did you try getting a cheap non-transponder key cut and did it work?
 
I just received the key fob from Supra, problem is the locksmith did a poor job of cutting the key, but I already love the durability of the new f0b housing..
 
@Strand4x4 Did you try getting a cheap non-transponder key cut and did it work?
I remembered that I had another non-oem key with my service records. I just tried it and it worked as long as the transponder from the other key was super close. I will see if I can get another key coded for a spare.
 

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