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Discussion Starter · #1 ·
My 2003 altima runs fine usually, except that it sometimes loses its power (happens when the weather is hot, it seems). The ses light turns on and ECU gives p0605. I went to a shop, they turned the light off and the car ran as before.

Such things occur several times. Should I replace the ECU? I ordered a used ECU (part of the purpose is to diagnose the problem), but I had trouble to make it work with my key.

Any suggestion will be greatly appreciated.
 

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My 2003 altima runs fine usually, except that it sometimes loses its power (happens when the weather is hot, it seems). The ses light turns on and ECU gives p0605. I went to a shop, they turned the light off and the car ran as before.

Such things occur several times. Should I replace the ECU? I ordered a used ECU (part of the purpose is to diagnose the problem), but I had trouble to make it work with my key.

Any suggestion will be greatly appreciated.

im no expert but i think a new ecu needs to have your keys programmed by a dealer using their special OBD computer. (only dealers have these and certain locksmiths).

also, the gas pedal on this car is controlled by the ecu i believe.

keep us posted and hope you solve this issue :(
 

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Discussion Starter · #3 ·
Idle problem?

Thanks to Gab2012 for answering my question. I went to a Nissan dealer and have had a new key. Now, the car becomes a different car. Its idle speed goes up and down from 1500 to 750 in a few seconds. Should I do any thing about it? Should I go to the dealer and let them reprogram the computer? As I know, Nissan has done some recall on Altima and I am not sure my new (used) ecu has an appropriate software in it.
 

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Thanks to Gab2012 for answering my question. I went to a Nissan dealer and have had a new key. Now, the car becomes a different car. Its idle speed goes up and down from 1500 to 750 in a few seconds. Should I do any thing about it? Should I go to the dealer and let them reprogram the computer? As I know, Nissan has done some recall on Altima and I am not sure my new (used) ecu has an appropriate software in it.


http://www.altimaforums.net/showthread.php?t=3708&highlight=idle+relearn


This may solve your problem. Worth a try
 
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