Question about 2003 Mazda Mazda6

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Can I replace the ecm in my 2003 mazda 6, can I

Can I replace the ecm in my 2003 mazda 6 or do I need the dealership to do it. If I can do it, can I purchase a new ecm anywhere, I have only found rebuilt/used ones?

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You can do it your self but the computer/ecm will need to be flashed. any Mobile lock smith can re flash the computer to your key for a small fee

Posted on Mar 09, 2009


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Posted on Jan 02, 2017


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How do you fix a U0100 code on a 203 Mazda 6

code u0100 refers to data bus, engine control module(ECM) A --no communication
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I have a 2003 mazda 6 2.3 engine has a misfire. could this be an ecm problem?

Have the fuel trims been checked? These (short term fuel trim - STFT and long term fuel trim - LTFT) can be checked with an OBDII tool, and can provide a lot of information about what may be happening. If you have a vacuum leak, for instance, the O2 sensors will report a lean condition to the ECM and it will add fuel to the engine to try to correct. You will see this in the fuel trim numbers.

So, yes, the ECM can cause the misfire, BUT if so, it's because something is not right in the engine. Have a qualified technician evaluate ALL parameters and determine what may be wrong. You've spent a lot of money on parts (O2 sensors, coils, plugs, wires, PCV valve and hose, alternator), and have invested a lot of your time. It's very possible that none, or only a couple, of those parts needed to be replaced. Invest in the expertise of a trained technician.

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Cylinders 4, 5 & 6 misfire. Lean bank 2 sensor 1 code and a mass air flow circuit code. 2003 Mazda Tribute V6. It was running fine then poof it was running rough. I am being told it may be a vacuum...

it is a regular fault
generally it is the Heated oxygen sensor (HO2S) in the exhaust manifold before the cat converter
other cause can include engine mechanical fault ( unlikely)---wiring---ignition / fuel system--injectors ---ECT/MAF sensor---ECM
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The HO2S reads the exhaust gas composition and reports to the ECM which then adjusts the air /fuel ration accordingly to keep it within set parameters
The code says bank 2 sensor 1 which is the HO2S sensor so replace it and then have the codes read again

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i know on some factory radios the radio code is sometimes on the back of the radio or in the owners manual. if its not there you will probably have to call the dealership and get it.

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What will my 2003 Mazda 6 do if the Electronic Control Module needs to be replaced? What will the diagnostic show if run on the car if this is what needs to be replaced? I have replaced several parts...

The ECM seldom goes on any vehicle.There is two things I would check.One is fuel reaching the injectors?.Check this first.Two are you getting a spark?

Dec 18, 2017 | 2003 Mazda Mazda6

1 Answer

The display isnt showing the time

yes the blub is blown you have to remove the radio to replace the bulb give these websites a try and if all fails stop by your local Mazda dealership in the parts department and they be able sell you the bulb and give you the pictures and diagrams you will need wish you the best of luck Michigan Man.

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Replace owner's manual

check ebay. otherwise, it's a call to the parts department at your local mazda dealership away.

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1 Answer

I am looking for a part number for a 2003 mazda 6, but don't know where to find diagrams

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