Question about 2001 Toyota Avalon

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Transponder or security system problem

Hey i lost my keys and had to replace the ecu,transponder with keys and barrel which i got from a local toyota wrecker after hooking it all up, the car turns over but doesnt fire??then after 5 seconds(of turning over) there is 3 loud beeps from the security system..the light flashes every second or so but nothing random..it also beeps the same when the key is removed from the key hole..do i need the transponder key to open the door first???does the car need a master reset to reconsise the new parts??disconnecting the battery doesnt reset it....as its with the security system do i need an auto sparkie or need toyota to have a look??please help me..regards hayden

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I would have a dealer look at it those alarms are very complicated..

Posted on Oct 28, 2008

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2 Answers

2001 chevy cavalier lost key can I replace the ignition switch without a key?


the original key is coded to your car.
So changing the barrel to have a new key wont help and ill tell you why.
Inside the original key is a transponder chip that is programmed to the cars immobiliser unit.
Attached to the ignition barrel is whats called a reader coil and its job is to read the keys chip when inserted in the barrel to deactivate the immobiliser so that the car will start.
What you need to do is contact a good knowlegable locksmith to provide a new key and code it to your car

Nov 03, 2016 | Cars & Trucks

1 Answer

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.

Jun 11, 2014 | 2002 Toyota Sequoia

1 Answer

I want to start the engine of Toyota innova , but the car is fitted theft deterant system immobilizer system and for that the customer in not financially sound to replace the faulty transponder system,...


It's impossible to start the engine without the transponder chip inside the key.. Only way is to buy a new same type key n virginize ur ECU n reprogram ur ECU to recognize the new key unless u still keep the original master key to activate the add key for slave key.. Look for lock smith will do the job.

Feb 01, 2013 | Toyota Cars & Trucks

1 Answer

Need schematic wiring diagram for 2002 Toyota Caldina


This is an (almost) impossible task. The immobiliser ECU which reads the key communicates with, and is controlled by, the engine ECU.
It's not possible to just "bypass" the system.
I said "almost" impossible because with the right tools, knowledge and unlimited time it may be possible to capture the code of a useable system, then design and build a black box to respond correctly to the engine ECU, which would allow engine operation.
If you have lost your only usable key, you need to order a new one (as you haven't indicated your exact model, I can't give you the correct part number - keys are different depending on model/engine).
You will also need a dealer who can programme a new key to your existing vehicle.
If your existing vehicle has problems with the immobiliser, you may be able to find a Toyota dealer to interrogate your OBD to see what the issue is. If not, replace the key transponder unit, then the ECU.
I've assumed you know it's an immobiliser issue, and that you've done the usual wiring and fuse checks etc.

Oct 27, 2012 | 2002 Toyota Caldina

1 Answer

Immoboliser of city dont work


First of all you need to programm all ignition keys using suitable diagnostic equipment (VAS, VAG-Com) connected to the data link connector of the car.

You have an electronic immobilizer key recognition problem. Now your key chip is not recognized by the transponder antenna fitted on the ignition switch barrel.

  • Everytime when you had a new key you must programm all available ignition car keys before trying to start the engine with this new key !!!

  • You have an electronic immobilizer key recognition problem. Your key chip is not recognized by the transponder antenna fitted on the ignition switch barrel. Do you have this warning symbol lightning on the dashboard?

    tdisline_775.jpg


    This warning lamp indicates that the engine is locked by the immobilizer system, and the engine start sequence must be repeat again.

    From year 1995 in Audi-VW (VAG) cars is used engine immobilizer. The VAG group immobilizer system consists of an immobilizer ECU which controls the recognition of keys and the Engine Management ECU system. Immobilizer is activated when the ignition key is removed and, together with the engine control unit, largely prevents unauthorized starting of the engine. The system uses a transmitter and receiver unit in the ignition key (transponder). Whenever an attempt is made to start the engine, it transmits a new code to the car's electronics. The immobilizing is only cancelled and car motor electronic receives permission to start engine if the key sends a right authorization code.

    tdisline_776.jpg
    Use another ignition key that you have, and start the engine.

    You will need to programm all ignition keys using suitable diagnostic equipment (VAS, VAG-Com) connected to the data link connector of the car.


    Oct 20, 2011 | 1997 Volkswagen Golf

    1 Answer

    Car wont start or turn over have already changed oil sparkplugs and baterry. is there a mobilizer for the security system?


    Yes, you have PATS II. There is a tranceiver on the ignition barrel and a transponder in every factory key. If the transceiver cannot read your key, the red security light will blink rapidly.If this happens, make sure you are using a factory key and there are no other factory keys near the switch. If it continues to blink rapidly, you might try removing the PATS ring from the key barrel and placing a factory key in the center of the ring. I have done this successfully in the past. If it works, tape up the key inside the ring and place it in the open space in the steering column shroud. Then remove the transponder from any other factory keys. You can then have keys made at a hardware store, as your one transponder inside the column will constantly respond to the PATS system.

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