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I Have a 98 Hyundai Coupe and had to replace the ecu. How do I reset the immobilizer and key so it will start with the replaced ecu. Could not get the same immobilizer for the ecu that has been replaced.

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Isn't there a little box with the spare key chip in it if so replace the chip with a new one @@ first try this
Activate the Key Fob. Many manufactures will not allow the car to start when the panic button has been pushed. Hold down the panic button for five seconds to reset the immobilizer. Next, push the lock button two times and wait ten feet away from the car for ten minutes.

Posted on Feb 10, 2019

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Well, ya might wanna do the Math; the money you spent for the New ECU, Plus reprogramming, Plus a new Valve timing belt, Plus other issues which are not evident because, the Car isn't running... I'm pretty sure we've past the Car's value.
https://www.nadaguides.com/Cars/1998/Hyundai/Tiburon/2-Door-Coupe/Values
However,
You need the Key that is for that ECU
OR
A *new key needs to be programed into the ECU
Also, since the ECU has been unplugged for x amount of time; The ECU needs to be programed, Now
*Your OLD Key may not be readable.

For do it yourselfers; When replacing PCM/ECUs,
Body PCMs, Programable Fuel injection, Instruments and such... with used parts
Recommend; getting access to a complete RUNNING donner Car at Pick and Pull or Pull Part or...


Sorry, I'd like to help but, Seems to me a Dealer only problem at this point.

Posted on Feb 10, 2019

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Posted on Jan 02, 2017

chiquititas
  • 1010 Answers

SOURCE: 2001 hyundai elentra scanner said i have a bad cam sensor and map sensoer replaced both and the scanner is still reading the same code

The problem is in your steering wheel

Posted on Jun 26, 2008

  • 187 Answers

SOURCE: I need the key to start engine or by-pass the immobilizer.

There is a chip in the key on the newer cars. The dealer should be able to send your information to Hyundai and order a new key. Pricey. Check with another dealer.

Posted on May 10, 2009

  • 3 Answers

SOURCE: reset ecu and engine management light

Ok guys check this out.I ran out of petrol(ok I am a girl!) and the yellow engine light stayed on afterwards.Hyundai said I would have to sell my soul to get it sorted but would be ok to run I t failed it's Mot on emission,but the local garage managed to temporarily fix the problem to get it through.The light came back on after wards-!!! So I did some research on Internet and here's how to reset it yourself-- Take off positive lead from battery,then turn ignition key on to get rid of any stored power.Then pump the footbrake(yeah I wondered why!) for about 20 secs.You will hear allsorts of clicking in the engine as ecu resets.Then reconnect battery lead!! Wallah !!!!
I went armed with this knowledge to the local garage(much to their amusement) and asked if they could reset the ecu,and they said a dealer would have to do it.I said well I know how and asked them to disconnect battery for me(their frowns got deeper by the minute).The rest I did in front of them,They were gobsmacked!!!!
They were amazed and asked me to call in a few days to tell them if it had worked permanent as they had learned something----so far so good!!!!
I f you have a computorised radio make sure you know the reset code for that as it may knock it off.
The ecu resets when you drive away.Now drives like a dream.

Posted on Dec 20, 2009

  • 395 Answers

SOURCE: replaced fuel pump in 2000 hyundai elantra and

well if she ran it to long with no oil it might be locked up and might be able to turn it over if its not to bad. but you should still get power going to your fuel pump i would check all connection going to fuel pump and no broken wires. try even un plugging battery to see if there's a bypass

Posted on May 05, 2010

  • 510 Answers

SOURCE: Remote control receiver unit were is it , and a

This reset for key fob Hyundai coupe year 02 to 04
Turn ignition to position two
Press lock or unlock once
Ensure indicators flash once to confirm reset
This will enable fob providing you have no other faults
Good luck barry

Posted on May 12, 2010

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It doesnt work that way. The immobilizer is part of the ECU computer. you need to use the proper keys or have the dealer reprogram the ECU to use new keys. There is no bypass.

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In many vehicles, disconnecting the negative terminal on the battery for 10 minutes with work. Remember, the intent of an immobilizer is to prevent a car from being moved... it won't start. Disconnecting the battery does the same thing and resets the ECU which works with the starter circuit. In some models, put the key in the ignition switch to the ACC position will do the same thing... this lets the car's ECU know that whoever wants to move the car, has the key so it is probably not a theft attempt.

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Why does the security light flash even when key is on and engine will not start?


The security light flashing is the indicator. The fuel pump is disabled by the ECU because the immobilizer system does not recognize the transponder chip inside the key.

There could be several causes.
a. Either the transponder chip inside the key is bad, not programmed, or missing
b. The antennae that is located around the ignition lock is bad and/or not reading the transponder chip inside the key.
c. There is a wiring issue between the ECU and antennae.
d. The ECU is bad

You may want to seek out a qualified mechanic or automotive locksmith for help, not all mechanics and/or locksmiths are capable of handling the immobilizer systems on these vehicles. So be clear when discussing your problem to them and make sure they are capable of handling this type of problem.

If the key is not original, check to see if it is a cloned key. Some cloned keys use batteries, when the battery inside the key dies, it no longer communicates with the vehicle. Although it's not common, regular transponder chips can go bad, usually due to physical damage.

An immobilizer transceiver coil tester can be used to test the signal from the antennae at the lock cylinder.

If the ECU is determined to be bad, a used ECU with matching part numbers can be used as a replacement. Contrary to what a dealership or some shops may tell you, all that is required is an immobilizer reset service on the used, replacement, ECU to get it to function with your vehicle. A used ECU and an Immobilizer Reset Service is much cheaper than a new ECU from the dealer. Make absolutely sure that this is the problem before going this route though.

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hear is the solution change the wire to the immobilizer
then try start the car now....my car start at ones no problem any more.......
in the junk yard i find one to my hyundai sonata it is white then i clip the wires and take home and sample with plugs
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