Horn a\cnd + ecu fuses not instaled in my avanti

Sometimes its because of a faulty charge connection at battery. Check..
If all is ok, and still a problem - look for the fuse to horn/alarm , replace
The FOB and ecu also has issues when parked around alot of other cars, garage doors transmitters/ codes.. in short it could be a variety of options

great question, im ane ECU spirt. )EFI.
what country, nobody ever says, that but gee, the OBD varies buy
COUNTRY!
Ill pretend USA. /Canada.

In the USA the car has OBD2. and you need a scan tool that works
on 2002 cars.
what engine, some engines have different ECU. radical differ..
they had like 3 engines here, other countries 9.

the scan tools connects to the 16pin, OBD2 connector at dash.
i the car is Can-bus. it needs a can-bus tool, all new tools work on canbus but old ones never do. (i have them back to 1995 and know this)
NON comms and tool is ok, not wrong tool . diagnosis.

1. Pin 16 not at 12vdc, (blown fuse)
2. ECU dead, 99% of time blown fuse to EFI. test the fuses to all EFI parts. alldata.com wiring shows that.
3. bad wiring to the DCL connector (rare) or from there to ECU
4. yes, some crappy tools have no ground on both pin 4 and 5, buy a tool that has 2 pins there. OR it will fail on some cars. seen many POS ELM327 tools that do this horror, get a tool called, INNOVA 3160 and stop guessing, this tool works on all cars.
5. barrow, rent , or buy or ask any sharp mech top scan car , his tool works.
6. Fuses that look ok can IN FACT be bad, we never assume they ar good we test them. using either method, OHMS or 12vdc on both sides, is better. see? only the voltage matters, all else punts.
7. The 3.3l communicates on pin 1 and 2..

pin 2 is PCM/ECU. VPW signalling.
and is not can-bus, yet.
simular to this.
http://ww2.justanswer.com/uploads/FO/fordguy4u/2013-03-02_224407_a1.jpg


top right photos
http://www.diagnostics4u.com/uploads/asset_image/2_4.jpg


there you go, you tool must have VPW support on pin 2.

old post
" ecu wont read bur" ><<<< i can not decode this.
bur, vur,nur, byr,bir, nah, bue, but, ah its BUT? (type analysis, me bad)
ECU won't read ,but fues is good, (test fuse, never just look)
What does wont read mean. by what tool by what actions, by you.?
IF the ECU will not scan with a new scan too the fuses are blown.
period! (or wrong scan tool;) this year is VPW OBD2. (ask)

simple answer, alldata.com RTM.
long answer.
we cant answer on any car lacking engine size (type) and country.
sorry. can't. and be RIGHT.
in uSA its 3 engine this year.
2.2 L I4
3.2 L V6
3.5 L V6 each can be quite different, post engine.

Generics.
horn don't blow can be blown fuse. test them. the one marked HORN being first.
can be bad horn relay or bad clockspring. or even a bad horn
to test any horn, HOT wire it. to any 12vdc battery.

ECU issues, gee, what country and engine and what are the Symptoms of your ECU. in details. running or not.
hot or cold, driving or not.

Horns are pretty simple units and don't need to feed through the ECU.
When you say you have checked the wiring and tested it, do you mean the wiring at the horns? or the wiring at the horn button on the steering wheel pad or where ever your horn button is located?
Sometimes the horn button breaks usually due to wear, If that is the case you will need to remove the horn pad or button and check/repair or replace. If this is working then most likely your horns are dead, not usual as they are fairly robust but not unheard of.

horns stuck up ,behind the front bumper ,get assistant to hold on horn button and tap horns with a light hammer and see what happens

It sounds like you most likely have a bad Horn. This can happen from time to time, especially if you over use your horn.... But that's not saying you have ;)

You can check your horn by removing the wiring harness connected to it and placing a test light in each socket. Have a friend press the horn inside the car on the steering wheel while you test the harness and look for both positive lights when the horn is pressed and ground lights when it is not pressed.

If you don't know how to do this, or you don't have the tools, taking your car to your nearest auto parts store and ask them to give you a hand if they will.

Otherwise it's time to replace the horn. :)

Whenever the 'CHECK ENGINE' light comes on, the ECU (Engine Control Unit) sets a Diagnostic Trouble Code (DTC). These codes identify the particular engine management system which caused the light to come on. You'll need to use/find an OBDII (On-Board Diagnostic) Scanner to retrieve any code which have been stored in the ECU computer. Afterward, we might be able to help you DIAGNOSE and perhaps eventually fix the problem.

The switch in steering wheel may be shot. Also check wiring to horn and you can also try connecting horn straight to horn.

If all fuses are ok and the relays click then the horns should be replaced and window regulator and motor should be replaced as well.

Try using a 12volt jumper wire directly to the horn from the car battery. also check the ground on the horn. The last thing I would do is pull the steering wheel cover. Make sure the horn is blowing first.