Question about 2002 Isuzu Rodeo

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Where is the ecu ground on a 2002 4sl rodeo

Horn wont blow and ecu wont read bur fuse is good

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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.

Posted on Jun 01, 2014

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betz73
  • 298 Answers

SOURCE: 97 rodeo heater fan wont blow i checked fuses

I would check your blower motor. That sounds like the problem.

Posted on Nov 20, 2008

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2001 VW Bug Horn was randomly honking, Now it wont work at all. Relays and Fuses are good. Should I just replace the horn itself? Not quite sure whats the issue.Want to figure out before making drive


it the horn activates randomly when driving and when the steering wheel is moved , the problem will be the ground contact under the steering wheel
there is a small spring loaded button that runs on a slip ring in the back of the steering wheel and intermittent/ random operation can be traced back to a fault in this area
the horn works so it is good , the fuses and relays are working to make the horn work so they are good ( unless there is a grounding problem with the relay causing the relay to operate and blow the horn)

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Horn wont blow


Check for blown fuse first. If fuse ok, you will have to check for a power and ground supply directly at the horn itself. Possible causes are... defective horn...blown fuse.... defective horn relay....defective horn pad.... defective clock spring..... broken wiring. There is a lot of electrical diagnostics that need to be performed to make this simple horn operate

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How do I fix the horn on my 1964 Ford Thunderbird


check for 12 vots of power at the horn itself when pressing the horn button. If there is a reading then replace the horn unit. If there is no reading at the unit I would suspect no contact in the horn button/control itself.

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2002 rodeo is my obd ground bad my ecu wont communicate and horn wont blow but fuse is good


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.

Apr 01, 2014 | 2002 Isuzu Rodeo

2 Answers

Horn doesnt work all fuses and relays are good


If you know the fuse and relay have power, you should be able to jumper the relay and make the horn blow. The horn pad on the steering wheel usually grounds the relay. If you can jumper the relay and make the horn blow, the problem may be the horn pad or the clockspring in the steering column.

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1993 Geo tracker blows fuse when the horn is honked


If blowing fuse when honking horn you have a bad ground to the horn or the horn itself has a internail switch. Try using a higher amp fuse, good luck

Apr 04, 2011 | 1993 Geo Tracker

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Horn on 99 rodeo doesnt work, when i press the horn I hear a clicking noise in glove box area


clicking is probably a good sign
it should be telling us that the switch, fuse and wires are okay

first guess would be a bad horn

however, easiest diagnoses will be to swap relays with a know good and retest

finally, at least jump a live power wire to the horn to see if they work...still could be a ground issue at the horn


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Horn wont blow horn works when i touched it with hot wire


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On my 1972 duster,when i blow the horn,the fuse blows and the tail lights go out also. the same fuse runs both.what could be the problem?


This sounds like the horn may have a short in it somewhere. Does the horn blow at all? Try this: Make sure you have a good fuse installed to this circuit again. Disconnect the horn and place a volt/ohm meter set to DC volts on the horn connections. If there is just 1 wire going to the horn, put that wire on the red wire of the meter. Put the black wire of the meter to a good ground, preferably the negative battery terminal. Now press the horn and see if there is a reading of around 12 Volts. If so, replace the horn. If not, and the fuse blows again, check the wiring for a fray/short to ground. When you're looking at the horn of course, make sure the positive lead isn't shorting to ground as well.

I hope this helps! Let me know if you need any more assistance! :)

-Jason

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Horn wont work.i check the fuse in the door and


Maybe horn became unplugged. Put 12 v power to horn make sure horn works. Put test light on terminal on horn have someone press the horn button, if light comes on and horn does not blow you may need new horn. if light does not come on you may have bad contact at horn button, blown fuse, broken wire, bad horn relay or possibly just a bad ground.

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