1996 Nissan Maxima GXE Fail Smog Check Due To ECM System Failure
My 1996 Nissan Maxima failed the smog check in california due to a System Malfunction Light. The check engine light is not on in my carm, but the repair/smog shop says it is not running the monitors necessary to pass the smog inspection. My mechanic says the ECM is bad in the vehicle. I purchased a used ECM and replaced the old one and this did not fix the problem. I called the local Nissan Dealer and found that this problem of the ODB2 not running monitors is a notorius issue with the 1996 Maxima's. There is no way to fix this issue, so if your Maxima is not passing smog for the same reason you will have to work with the state agency who oversees the SMOG System and get them to waive the computer diagnostic section of the SMOG check for you.
Re: 1996 Nissan Maxima GXE Fail Smog Check Due To ECM...
There is no way to fix this issue according to my Nissan Dealer Service Manager. The monitors will not run and therefore the vehicle will not pass smog. If you need assistance from California's SMOG authority they are called "The Referee" and you can call them at 1-800-622-7733.
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The person running the test is an idiot. The OBDII test instrument is not capable of determining if there is a warning lamp failure. It is probably guessing based on voltage level, but lamp resistance does normally vary. The test is supposed to be done visually. Take it to someone else, and they will probably be more competent and pass your car.
Well you'll need to find out what is making it emit the high levels. Is the check engine light on? You may need to replace the catalytic converter. Also, verify that all the smog related items on the motor are connected and working.
Running LOUD at the front of the car is most likely a broken exhaust manifold. You can bet come the next SMOG check that the person inspecting the car will fail the SMOG inspection due to a breech in the system.
You did not mention any noticeable knocking sound so I have to assmue that it is exhaust related.
the no data error can be contributed to a bad interface cable or the scaqn tool was configured wrong and therfore could not connect to the ecm. I would recommend having a scan done again by a certiefied volkswagon tech chances are the mechanics used the wrong adapter cable or reader card. your smog problem could be that your evap canister is clogged therfore gives a bad reading.unfortunately you have to have a scan done but try an independant small shop that delas exclusively with foreign cars such as porche andd mercedez. the will have the correct scan tool and will be much cheaper than a dealership. your cost should be no more than 50 dollars US ... please rate this. thanks