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No comunication with ECM

Tiny
RIKICIVIC04
  • MEMBER
  • 2004 HONDA CIVIC
  • 1.7L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 125,000 MILES
The check engine light is on, the immobilizer light is flashing, there is no communication with the scan tool. The temperature gauge is inoperative. The car runs sluggishly, no acceleration. I am stuck with this problem because I change the ECM and the mechanic reprogrammed the module; everything was perfect in this moment, but when I turn the ignition off and I tried to turn it on again, the same problem occurred. I do not know what is wrong with my car. I know that it has to be an electrical problem, but I do not know where can I find it. I have read some comments posted in this forum and I found somebody with the same problem six years ago and the expert suggested check the cluster. I think that it is only the part under dashboard that I did not replace because I replaced the ECM and Multiplex. Please I need your help in this case
Note: I have already check the power in the plugs' cluster and it is okay. Also, I checked all fuses and relays and everything looks okay.
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Tuesday, February 14th, 2017 AT 9:18 AM

7 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If the immobilizer is flashing then there is a chance the ECM was not reprogrammed right. Or there is a shorted wire or it is a can bus problem that only a pro scanner can detect. Take it back to where the work was done.
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Tuesday, February 14th, 2017 AT 9:35 AM
Tiny
RIKICIVIC04
  • MEMBER
  • 5 POSTS
Thanks for your quick response. I took it back and "the expert" tried to establish communication with the vehicle, but there is no communication at all. He tried with more than one scan tool, and also with a X431Launch with no response from the vehicle.
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Tuesday, February 14th, 2017 AT 9:49 AM
Tiny
RIKICIVIC04
  • MEMBER
  • 5 POSTS
I changed my alternator recently and I do not know if it is not good or any voltage had damaged the new computer. Do you think that I have to change this alternator? I bought it in Autozone. It is re-manufactured, but it has lifetime warranty.
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Tuesday, February 14th, 2017 AT 10:10 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
No the alternator should be okay. Sounds like the mechanic is too lazy to see what the problem is for no communication. He should be checking the wires to ECM an DECM for bent pins/poor connections.
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Tuesday, February 14th, 2017 AT 12:01 PM
Tiny
RIKICIVIC04
  • MEMBER
  • 5 POSTS
Hi, the mechanic has been checking, but he did not find any bent pins. The connections were checked and everything seems to be okay. Now my question: Is there any possibility that the cluster has a short circuit that elicit ECM's damages or the loose of communication?
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Wednesday, February 15th, 2017 AT 4:04 PM
Tiny
RIKICIVIC04
  • MEMBER
  • 5 POSTS
When I replaced my ECM, I can establish a connection pretty well. As soon as I turn off my car, it never responded again. I have though to buy a cluster and other ECM to replace them, as well. I do not know if my idea is wrong, but I stuck in this problem. Remember that I have also replace the multiplex.
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Wednesday, February 15th, 2017 AT 4:18 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
The wiring should be checked with an ohm meter that will tell if the connection is the dash or not or an ECM problem etc.
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Wednesday, February 15th, 2017 AT 4:27 PM

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