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Fried my ecm on my 03 ex v-tech

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Old May 25, 2021
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Fried my ecm on my 03 ex v-tech
Basically I bought the used ecm lock cylinder with immobilizer and key figuring lM good.
wrong!!! I don’t understand how this is not fixing my problem.
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Old May 25, 2021
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Re: Fried my ecm on my 03 ex v-tech
What problems are you having? Loose alternator mounting bolts are very common and can fry ECUs.

https://www.civicforums.com/forums/3...-help-now.html
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Old May 25, 2021
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Re: Fried my ecm on my 03 ex v-tech
Originally Posted by BrotatoChip
What problems are you having? Loose alternator mounting bolts are very common and can fry ECUs.

https://www.civicforums.com/forums/3...-help-now.html
Yes I had my alternator fry my ecm. Problem is that I have had 2 locksmiths and still no fix so I broke Down and bought the ecm with ignition cylinder with immobilizer and key a still won’t start.
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Old May 25, 2021
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Re: Fried my ecm on my 03 ex v-tech
Is the key symbol in the cluster flashing? Maybe the ECM, immobilizer, and keys don't match and need programmed.
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Old May 25, 2021
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Re: Fried my ecm on my 03 ex v-tech
No , the key actually was good with no flashing green light. I also have an Autel AP 200 tool that can program keys, reset ecm/pcm , replace immobilizer control unit.
I just can’t write the vin number
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Old May 25, 2021
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Re: Fried my ecm on my 03 ex v-tech
When you turn the key on does the key symbol come on for a few seconds and then go off? This would indicate the immobilizer is working properly.

Do you hear the fuel pump prime when you turn the key on?
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Old May 25, 2021
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Re: Fried my ecm on my 03 ex v-tech
Originally Posted by Darin Harrison
Basically I bought the used ecm lock cylinder with immobilizer and key figuring lM good.
wrong!!! I don’t understand how this is not fixing my problem.
Originally Posted by BrotatoChip
When you turn the key on does the key symbol come on for a few seconds and then go off? This would indicate the immobilizer is working properly.

Do you hear the fuel pump prime when you turn the key on?
yes and yes
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Old May 25, 2021
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Re: Fried my ecm on my 03 ex v-tech
If yes to both your issue is not the immobilizer. You will want to start checking mechanical issues. Check compression, spark, and fuel pressure at the engine. Check engine light on?
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Old May 25, 2021
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Re: Fried my ecm on my 03 ex v-tech
Yeah, sorry about that. I’m a rookie on the site.
lol. I have spark and fuel. I’m getting 5 volts at sensors letting me know computer is communicating but I lost my compression tester
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Re: Fried my ecm on my 03 ex v-tech
Originally Posted by Darin Harrison
I lost my compression tester
You will want to find it or rent one to test. You will also want to check engine timing. Check engine light on? Any faults?
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Re: Fried my ecm on my 03 ex v-tech
No faults showing. I changed the timing belt myself and when I was rushing to put everything back together I didn’t tighten a ground on the alternator. Not to mention that I had to wait a week for a tool for holding back up on the crankshaft with the battery un hooked that long. Week I think.
went into limp mode with green key flashing but would still start but in limp mode.
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