C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

ECM Failure

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Old Mar 6, 2004 | 05:01 PM
  #1  
1990CORVETTE's Avatar
1990CORVETTE
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Default ECM Failure

If my ECM is going bad,, how would I know,,, what are the symptoms????

I did a complete tune up on the car this week,, from O2 sensor, new gaskets on everything to you name it I did it..........
I drove it around the loop down here and I am getting 30.8 MPG :yesnod: :cool:

But yesterday I took it for a ride and it threw a 42 code on me,,, possible of ECM failure,,, what are the symptoms??????????
Thanks
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Old Mar 6, 2004 | 06:12 PM
  #2  
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kman0066
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From: Nashville TN
Default Re: ECM Failure (1990CORVETTE)

Code 42 probably means a knock sensor. I got that code once and found that the wire going to the knock sensor had come off.
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Old Mar 6, 2004 | 06:25 PM
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EDMGUY
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Default Re: ECM Failure (kman0066)

I would Like to know what to look for when a ECM is going out.
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Old Mar 6, 2004 | 06:35 PM
  #4  
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kman0066
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Default Re: ECM Failure (EDMGUY)

A lack of code 12.
A lack of the fuel injectors not turning on when the motor turns over.
A code 72. >>>
A code 41. >>> ALL DO TO COMMUNICATION PROBLEMS BETWEEN ECM AND CCM
A code 74. >>>
Service ASR light
SECURITY/SYS lights flashing at the same time

This is what I have and from looking through the archived posts, these seem to be the usual symptoms to ECM failures. I am ordering one this weekend and will udpate if it fixes the above problems like it has in the past for others.
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Old Mar 6, 2004 | 10:41 PM
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1990CORVETTE
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Default Re: ECM Failure (kman0066)

Code 42 probably means a knock sensor. I got that code once and found that the wire going to the knock sensor had come off.
i'll check this tomorrow
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Old Mar 6, 2004 | 10:48 PM
  #6  
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From: Silicon Valley Kalifornia
Default Re: ECM Failure (1990CORVETTE)

Make sure the ECM connectors have the "finger" thingys installed...they push on the connector contacts to insure contact. They are usually blue or yellow in color.
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