Question about 2000 Mitsubishi Eclipse

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2000 eclipse gt getting a po1400 code and car does not idle right all the time and sometimes it dies. Mechanic said it was ecm, any ideas

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PO1400 is not a common code. PO140 however is. PO140 is a oxygen sensor problem, it refers to bank 1 sensor 2 having no activity. This could cause your eclipse to not hold a good idle and possibly to stall. I would have a different mechanic check the car before you spend quite a bit of cash on an ECM as they can cost upwards of 800 dollars

Posted on Sep 11, 2010

  • 65bulldog Sep 11, 2010

    the code 1400 was auxillary emissions according to the parts store

  • Nick Sep 11, 2010

    Ok I actually had to do a little homework on this other than just thinking and using what I already knew. P1400 is a code for the Manifold Differential Sensor. This is cause by voltage to the sensor being incorrect. Either the voltage is too low or too high for more than 2 seconds. This can be caused by a multitude of different things including the ECM. However it could be as easy as the sensor not being plugged all the way in. First I would check to make sure that it is plugged in all the way. If it is I would replace the sensor first. It is the cheaper way to go. after that unfortunately the ECM would be the next step. It will run you around 1500 for an automatic and about 900 for the one that goes with a manual trans. (please keep in mind that these are prices for ECMs from the dealer) However this can also be caused by a short in the wiring (a spot of bare wire grounding out to somewhere). So replacing the ECM may not solve your problem. Your mechanic is taking the expencive route first by replacing the ECM. You may want to take it back to him armed with a little more knowledge that you now have and have him replace the sensor first. If it works then you have fixed the car for a third of the cost of replacing the ECM.

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I have a 2000 Mitsubishi eclipse and my radiator fans run from startup a few minutes after shut off.It affects heat until higher rpms.i need better heat and quicker.


Here are a couple of thoughts on this problem:

1. Just for fun and giggles, it might be a good idea to have the thermostat checked one more time. I know it is a new thermostat but you never known if a thermostat may have failed even right out of the box. It is possible that thermostat could be shot, even thought it was new. I know it is a long-shot, but it never hurts to give it a try.
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If the car changes the RPM dinamically then it would be O2 sensor, often stalls. Regarding clogged injection, preliminary try to rev to higher RPM, if that is the problem fast you will see the difference (maybe solves the problem, maybe will require cleaning.

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