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Early models used a static code in the ignition key (or key fob) which was recognised by an RFID loop around the lock barrel and checked against the vehicle's engine control unit (ECU) for a match. If the code is unrecognised, the ECU will not allow fuel to flow and ignition to take place. Later models use rolling codes or advanced cryptography to defeat copying of the code from the key or ECU.
The microcircuit inside the key is activated by a small electromagnetic field which induces current to flow inside the key body, which in turn broadcasts a unique binary code which is read by the automobile's ECU. When the ECU determines that the coded key is both current and valid, the ECU activates the fuel-injection sequence.
OMG! This happened to me last night and I almost $h!t my pants. I had a weird scenario where the security light would blink with the key in the ignition and the car won't start, but after a few tries of inserting and removing the key it would eventually recognize the key and start the car.
One additional note; Check for the CEL light when your key is in the ACC position. The CEL will only appear if the ecu recognizes the key transponder.
Just as I was about to call in to re-flash the ecu today, I decided to go back to the basics of troubleshooting. I unplugged the negative battery for a good 5 minutes just for good measure. During this time I checked all the fuses related to the ecu at all 3 locations by manually pulling them and visually checking, and they all came back good. After plugging the neg back in, I was very fortunate that it started working again. The ecu recognized the key and the car started right away.
Moral of the story... go back to the basics before jumping into conclusions. It saved me some money.
|Are you sure the CEL isn't related to something else and you disconnecting the battery didn't simply erase the CEL?|
I have a 2001 and a working master key, what do I need to do to program a second key? Are there instructions posted for doing this myself? I have another (master) key that isnt for this car but is the same style, can I transfer the remote parts from that key into a new blank, have that cut and then have it programmed?
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